Robimo press the laser, which I will burn, from the DVD drive with my own hands. A simple circuit irradiates with a laser diode and controls the output voltage. Laser connection circuit.

Our meta is a laser module.

Before disconnecting the module itself, we short-circuited all three wires with a thin copper dart (we took one thread from a large wire). This is necessary for protection against static.

Now you can use the laser module. It’s not good to “sit” there until you’re done, you need to work on it and balance it between “getting rid of it” and “not spoiling it.”

The axis seems to be going out like this.

To eliminate these inconsistencies, it is recommended to carry out a detailed cleaning of the device, as well as the lens, to eliminate the accumulated saw and beam. Another problem with these types of components lies in the structure, which causes fragmentation of the sensors, fragments of the smell in units, as a vicorist laser passes through lenses, which tend to wear out when they vikoristan.

The laser suffers from progressive degradation, wasting its initial power and causing us great headaches when trying to visualize instead of a disk, which laser cannot be read through its wear. If the laser is damaged and the lenses are obstructed, it is practically impossible for the reader to recognize the type of media, and also does not allow us to visualize the information recorded on it.

Folding circuits

We didn’t bother and completed the hanging installation.

life

We quickly became a stabilized block of life.

Closed

We didn’t have any such points and we all worked at our own risk. And the axis of the red eyepieces, on the side of the eyepieces for safety, allows for better cleaning of the laser laser itself. For beauty, you can let Dima in, as we did in the outpost before video.

It is not possible to display media formats, so they cannot be created in place of the disc that we sent. Thus, devices cannot issue the necessary commands to change these parameters and, therefore, to display any type together.

This change often appears more often during the recording process on the nose and can prevent the operator from adding a new component unnecessarily. We guess that the reasons for such shortcomings, which sometimes suffer from optical devices, mainly come down to accumulated debris.

Trial run

In the dark, he works like a light-hearted man.

Focus lens

It is difficult to focus through the lens, but without a solid body it will be more tedious.

Prepared body

Obov'yazkovo needs to isolate everything.

Lens

Before speaking, this lens works better if it is turned upside down to the laser diode.

More and less collections can be regulated and eliminated.

It is possible to adjust precisely, melodiously, but we won’t be able to wait until the black plastic begins to melt.

I burned the sirnik mittevo.

The black electrical tape was cut like a knife through butter.

With this laser, there would be a miracle harmata for the soldiers.

Video

We do not recommend opening the device for manual lens cleaning, as splinters in the wrong hands can cause permanent damage to the component. Another reason, which often causes failures of the optical drive, can be associated with improper installation of a component in the middle of our computer's chassis.

In many cases, the optical drives are damaged and stop working, because their lens is unbalanced or off-center due to the bad fastening of the element at the frame. At this point, it is important to use a top hat made from durable materials to ensure rigidity.

Chantly, since childhood, everyone has had the dream of their mother, her powerful, powerful laser, capable of scorching sheets of steel, now we can get one step closer to death! the leaves will not be cut, but the bags, papier, and plastic are easy to cut!

There are two current technologies for data saving devices: magnetic and optical. The first is already a lot of controversy in both the digital and analogue areas. Optical technology saves data and saves more time. CDs. These types of disks can be used in both audio and computers.

The lines of the spirals are small and close to one, so they act like diffraction rays. Modeling of a vikoryst polycarbonate disk of a larger size. This disk model has a spiral track of marks, superimposed on one of the sides, and the marks contain encoded information.

For our laser, we need more than just a hack! The less expensive the cutter and the more you can burn discs faster, then you can use DVD-RW boot. When a drive writes DVD+/-R with 16x speed there is a 200 mW red laser, in 20x drives there is a 270 mW laser, and in drives with 22x speed the power can reach up to 300 mW. All DVD drives also burn an infrared laser, which means you will find out later. I’ll clarify right away, because there’s too much to blame. Video with FAQ, which you can read on our website http://lasers.org.ru/faq.html

The metal cap on the surface is what knocks and bounces off the laser vibration in the middle of the light sensor. If the dark focus of the laser is not displayed on the flat sector, the light detector should be turned off. When the mark is sharpened, the laser light in the middle of the light sensor will not be knocked out.

A metal ball that bounces is a problem with the durability of the disc. As with any new product, there are lessons learned and included in the new production. Let's paint the ball with the butt. The metal is applied to the surface of the trademark model with a polycarbonate disk behind the help of a plug, where the metal atoms are deposited in the form of a thin melt from the viscosity of the vacuum chamber. This thin metal float is like a vision.

Question: Which laser diode would you like?

Tip: Leave the LD only in front of the drive you are writing! why:

CD-RW - pressing 100-200 mW IR laser 780nm

DVD-Combo (DVD-Drive/CD-recordeble) - weak blue diode approximately like the Chinese order and a powerful 100-200 mW IR laser 780 nm

DVD-RW - pressed red LD 650nm 150-300 mW and pressed 100-200 mW IR laser 780nm

BLU-RAY ROM – blue-violet diode 405 nm with a power of 15 mW.

The laser reads the disc from the green side, so the ink on that side may be damaged. For the preparation of these discs, a white room is required, free from sawdust particles. On a disk, finely polished with an optical polish, a ball of light-sensitive material of high quality is embedded. On this ball you can record information directly to the laser menu. After completing the transcripts of the data, as in revenge, and in the admissions. This process is very similar to its development. When kept away from areas where the laser is exposed, the ball of photosensitive material becomes harder or becomes crumbly when dried in the baths.

BLU-RAY RW – blue-violet diode 405 nm with a intensity of 60-150 mW. Shine brighter than red.

In other everyday devices (printers, bears, barcode scanners, etc.) there are no lasers of sufficient power! Through tension, about 5 mW.

So let's get started! We disassemble the cutter and knit the optical part. This is what this part of the cutter looks like:

The only valuable thing there is the exit lens and two lasers. Now comes the most important thing - DVD laser:

The master signs up with the high-level laser, which helps one and zero to fight, which is formed from a series of microscopic openings. This original is being copyrighted for making copies. I'm done, the new ball is stuck in plastic. It is located just beyond the end of the occupied data area and is 1 mm wide.

The data is stored on the road made of polycarbonate material. The track begins in the center of the disc and ends on the outer side of the disc, creating a long thin spiral. These spirals have microscopic grooves, called pits, that are written onto the master disk and then stamped onto the surface of the polycarbonate disk during the replication stage.

And now respect! Before we start playing with our new toy, I’ll tell you how to use safety equipment. The laser from the DVD-RW drive is upgraded to class 3B, which means it is no longer safe for the eye! Don’t put it straight in your eyes and in the mirror! If you don’t even blink an eye, you will become much worse! a guy on one forum inadvertently exposed himself, wasting a thousand thousand. Tse youmu was spared. Let's focus and damage the view from a hundred meters away! Marvel at where you are shining!

The smooth area between two holes is called the ground. This is the land that contains the data that is stored on the disk. The disk's storage includes material that represents what is buried in the soil and in the earth. The way the light comes out depends on where the laser beam falls. The pit glows and glows with laser light, wrapping around the weak signal. The earth is not dark and light, but the light is interpreted as a strong signal. There are a number of pits and lands created by lanterns, which are called sectors.

In order to give up quick access, sectors that need to take revenge on the skin file may be expensive. All sectors are the same size and do not lie outside the position on the disk. The disk is rotated until the change is greater for sectors rotated on the inner part of the disk, and more for sectors rotated on the outer part.

How can you get an LD (laser diode)? It’s possible, it’s possible! It's really simple. Just move the string and the period will end. Moreover, often a microsecond will be enough! Therefore, LDs are afraid of static electricity. Protect your LD from new ones! In fact, the LD does not burn out, the optical resonator in the middle simply collapses and the LD turns into a primary light-emitting diode. The resonator does not move out of the struma, but out of the light intensity, which has its own element to lie under the struma. We also need to respect the temperature. When the laser is cooled, its CCD increases, and at the same time the intensity of the jet increases and the resonator can be destroyed! Be careful! It’s also easy to get hammered by transient processes that get stuck when turned on and off! It’s easy to get excited when you see them.

Reading procedure, type of wrapping, hour of access, search and change of speed. All the light that falls is reflected in an aluminum ball. Place a quantity of beaten light on the surface where the tray falls. In this way, we said that on the surface of the disk there is a number of openings, since the light sinks into the opening, it dissipates, and the intensity is much less, then we need to set the opening from scratch we are the ones who make holes, and we will be mothers I show two people.

Shoot the light directly through a series of lenses and mirrors onto a photo receiver, which collects the amount of light that was captured. The light energy of the photoreceiver is converted into electrical energy and a simple threshold, which our detector is visible, and the point indicated by the indicator is zero and one.

We remove the laser and wrap the thin vein and the rich vein around my legs! So that the LD visors are electrically connected! We solder a small non-polar capacitor of 0.1 µF and a polar capacitor of 100 µF to the bottom, and then we remove the core as it was wound! So we believe that we don’t like LD anymore!

The presence of an optical and non-magnetic read head eliminates many problems if there is no direct contact between the head and the surface of the disk, as well as additional steps that must be taken care of, such as cleaning the surface more saw accumulated on the surface of the lens, as much as possible The end pouch is pressed into the hibna to read the reader.

The disc can be wrapped differently depending on what type of drive it is wrapped in. Coming from this, we have two different types of wrapping. In this way, if the head is located near the edge, the engine wraps more tightly than if it is located near the center.

Now think about the food of our laser. The LD lives at approximately 3V and maintains 200-400 mA under pressure (drive speed). A laser is not a light bulb! Always do not connect it directly to the batteries! Without an intermediate resistor, you can quickly install 2 batteries as a laser pointer! LD is a non-linear element, which needs to live not by tension, but by force! These are the required jet interchange elements.

An hour of access takes up to an hour, which is required to begin reading until the data begins to be read. This parameter is determined by shutting down, searching for an hour, and then changing the fluidity. Rotating the cylinders of hard disks significantly speeds up the search time. The data is arranged in a spiral on the surface of the disk, so you can search for more information.

If the reading head is in the correct place for reading, if the disc is spinning, you must check once it has passed the required point to begin reading. For as long as it takes, on average, the information will not go through the docks, but the head that reads, checks, remains in the right place - this is what latency is called.

The laser axis looks like this in the middle:

Well, we need to power our laser!

Let's look at three schemes for living the LD from the simplest to the most complex. All circuits are based on constant flow, for example, batteries.

Option 1 The string is interconnected with a resistor.

The hour must be adjusted to the hour required to move the head, which is considered to be the position of the disk where the data is located. It makes sense to talk about this value in the middle, which is not the same, in order to reach the data that is located near the edge, and the other that is located near the center. This value comes with partial access, which is richer with more meaningful data.

This includes an hour of adaptation for each engine to ensure consistent fluidity if you know the point where the data will be found. Optical disks are mounted behind the scenes, so that all vikorist lasers are used for reading, but are not differentiated. The information recorded in them is encoded as a spiral of small inserts written on the surface of the disk at the time of recording, so they cannot be changed later. Suitable for: encyclopedias, legislation, technology, etc. A phase change involves a change in the powers of the compact disc, a change in its structure from amorphous to crystalline and so on.

The resistance of the resistor is determined experimentally, by flow through the LD. Varto switches to 200 mA for 16x, allowing the risk to burn more. I want my LD and at 300 mA to work miraculously. For life, you will need three batteries for the required capacity, and you can also manually remove the battery from your mobile phone (of any kind).

What is important is that you can increase the price of information online. It is used mainly for video, while some of it saves the sound and images, which are then unpacked in real time to create the original. Vіn vikorystvuetsya in the presence of secret information and helps.

It is used to save primary resources when necessary, being an alternative to microfiche. For this purpose, the plastic may be less compatible, and for this purpose, more balls are needed. In the case of suspended balls, it is possible to pump the ball, so that the offending balls can be counted from the same surface of the disk.

Advantages: simple design, high reliability.

Nedoliky: The flow through the LD falls step by step. And it wasn’t clear to everyone that the time had come to charge the structure. The use of three batteries has a foldable design and easy charging.

This circuit can easily be placed in a Chinese flashlight, which requires a battery of three AAA (pin) batteries.

Based on this, the classification is established on the basis of the number of balls and faces that are selected. Such technological advances have become possible due to a change in the size of the micro-empties, a smaller space between the tracks and the use of even higher data compression technologies.

If you offend the pads to remove data shares, you can save up to 8 GB. The laser beam can focus on any ball based on the transparent coating applied to the ball closest to the reader. The skin side can be one or two equal. Typically, a double-sided disk holds two levels of data, one of which is clearly visible. This feature allows you to save twice as much as a single-sided disc.

And this is how the axis looks like in the collection:

Two 1 Ohm resistors in series and two capacitors.

Option 2. Replacement of LM317 microcircuits.

This scheme is much more complex, and is wonderfully suitable for a stationary version of the laser! The driver contains the LM317 microcircuit, which is enabled by the struma stabilizer. Divine little ones.

The driver maintains a steady flow through the LD regardless of the operating temperature (not less than 7V). Please download the datasheet for this microcircuit and download it first, as well as the best driver for your home!

3 Option. Compact. On LM2621.

This is what you need! Life from two batteries, stable voltage (and therefore flow) on the LD, so you don’t lie in the level of charging batteries! If the batteries are discharged, the circuit will turn on and through the LD there will be a small flow (weak light). The most intelligent and economical driver! The efficiency factor is close to 90%. And all for one LM2621 in a small 3x3mm case!! It’s important to solder, then I got a 16x17mm board! And it didn’t come! Divine little ones.

I wound the throttle L1 around the coolers, the little one is smart, she can figure everything out on her own). I wound 15 turns of 0.5mm wire on the chokes from the computer power supply. The internal diameter of the choke is 2.5 mm, the penetration of ferrite is unknown. The Schottky diode may be 3 amperes. For example, 1N5821,30BQ060,31DQ10,MBRS340T3,SB360,SK34A,SR360. Resistor R1 adjusts the flow diode. Raju, at the hour of setup, connect there a changer for 100k. Before speaking, all testing should be carried out on a dead LD! Electrical parameters become permanent. Having chosen your preferred scheme, let’s choose it! Well, let the imagination take flight! I need to figure out how to secure the optics! Why does the LD need to be placed on the radiator! It’s good to warm up for the great struma! so think about the design ahead of time.

Laser optics.

It is easy to use a laser pointer as the basis of a collimator. She has a nasty lens. Ale will come out approximately 5 mm in diameter, but it will be rich. Traditional optics (exit lens) show better results, but they have their own difficulties. The focus is a little short, which means it’s very difficult to adjust the focus, but at the same time it allows you to cut a hole with a diameter of 1 mm!! Before washing, more energy is applied up to 1 mm 2 in this way, you can easily shake the black bags)) if you focus the focus not on the hole, but on the point, then at that point the plastic melts, the insulating tape is cut, the wood starts It’s already glowing white light under heating! (6000 degrees do not fry) and much more!! Before speaking, on our forum you can buy laser modules from AixiZ - with them you can clearly focus lasers for both range and weeding!

The axis of a bunch of photos is exchanged for the same pointers

How to select a laser pointer on the butt of a 300 mW red laser

Good evening!

For days I have been wondering what a marvelous laser this is... Just think, the energy created to melt plastic is concentrated in the exchange and is infinitely direct! Remember, what comes out of your hands will be as bad as hell! To the quiet places that seem inaccessible to people... and look at those passing by! There’s no mention of classmates and work colleagues, but there’s a stink in the room like a hot rinse that rips the mugs out of the black bag! I will tell you about the characteristics of the laser, and about the characteristics of the laser pointer on the conductor laser. So it’s already become a thing that people love to compare and agree with someone who has more, better, more expensive... and what parameters do lasers compare with? And this is where marketing comes in... 99% of people, when choosing a laser, are led to push! Stop tsking them in front of us! How do stinks have mercy... although it’s almost the same as people who marry megapixels.

In fact, tension is far from the ideal parameter for how to properly arrange laser pointers. I will change the parameters that are important to the end of the body: tension, strength, thickness of the exchanger (aperture), expansion of the exchanger, dimensions, protection from overheating, stability of the exchanged tension, strength of life, mechanical value. There are a lot of parameters, right? And now about the skin little by little...

Pushing-Intensity of light flow. Why is she so important? flawless! The tighter the better! One is a 100W bulb for 100W vypromіnu, more than a little, ale is not disappearing ... The pounded is the nasal snake: the attribution is a Jacob, Ale for Knock, Inshi parameters Teazh on the Testing.

Reliability: Well, here everything is clear, the more it is processed and the more “protection from foolishness” is better. This is about talking about Chinese cupcakes that can be sold online. Read the words of people and you will understand that the laser generates time, which is also luck.

Trade me: I would wonder, what's wrong? what an axis! If you distribute 300 mW of laser power over an area of ​​1 square meter, you won’t be able to see anything! We don’t talk about any melting effects, the furnace and the language are silent! In short, in order to melt, cut, and ignite, sufficient mixing strength is required. It can be increased in two ways, either by increasing the tightness or by changing the area where it is poured. If 300 mW of pressure is centered on a round pedestal with a diameter of 3 mm (the point of the original Chinese pointer is 1 mW), then the maximum amount of packages can be melted and that’s for a long time! the plastic doesn’t melt, the honeydews don’t burn... If you install good optics and make the line twice as thin, then the thickness increases 4 times! Here the plastic will melt and the cheesecakes will burn.

Razbіzhnіst exchange for me: It has already turned out that there is nothing ideal, and the laser beam gradually becomes wider and wider... already after a couple of tens of meters the diameter reaches 1 cm! the disunity lies in the exchange of goods. As soon as the thinnest one is washed, then it will be easier to diverge. However, the thin line extends to the darkness, and a small dot is visible on them.

Dimensions: Reduce everything to a minimum size and weight without changing other parameters.

Protection against overheating: The laser is pressed hard and warms up noticeably. Without cooling, it overheats in a couple of seconds. Having installed a larger radiator and ensured good contact, you can confidently say that the laser is not working properly because you forgot to turn it on.

Stability of simulated tension: The axis here is cool) did they light up on the Internet? 100 mW, 200 mW, 300 mW? but in reality it is two times less... on the right is that with the use of primitive drivers, the laser pressure is greatly affected by the batteries. I went to the websites of battery manufacturers and looked at the battery discharge graphs, so when the battery is new, it has 1.5 Volts, but after a second the voltage drops to 1.2-1.3 Volts! And so it goes on for a long hour, after which the voltage begins to drop rapidly - the battery is discharged. Well, this tension is induced for a life voltage of 4.5V, and in real life, after the laser is turned on, you will blink with constant tension, and then go to the mode with constant tension... these are the results... so that this does not happen, it is necessary to stagnate intelligent drivers that stabilize The laser current is independent of the batteries. But the roads stink and the Chinese don’t fight against them.

Handiness of food: Having fired the laser at the edge, you can live on two CR2 lithium batteries, which is good, right? small, light... but why would you pay 100 rubles for a skin battery? I'll sit down in a year, and what? I call 200r wikidati? You can't find these rare batteries in any store. The ones on the right are standard AAA and AA batteries and rechargeable batteries. cheaper and wider.

Mechanical value: Just marvel at the tricks of the laser, which fell hand-in-hand onto the asphalt... the more powerful the laser, the greater the confidence that you see in extreme minds. I sell lasers, so all these parameters are very important to me. And the axis of what I reached from this galus:

Fine? The “head” is turned on a lathe using aluminum, the laser definitely won’t overheat!)) The piece was taken from the lathe.

Driver: This is where I tried and built a wonderful driver! Vіn, regardless of the life cycle, maintains the output voltage at the level of 300 mW! There is no need to run out of power, because when replacing batteries with rechargeable batteries, the pressure drops, the effect of the first three seconds of depression, the pressure continues to be 300 mW until the batteries run out. Before speaking, the temperature is also monitored! We see seizures when the laser burns out in the cold. In the cold, the CCD increases and the laser goes out well. My driver monitors the temperature and, when cooled, gradually reduces the flow through the diode. Having tried it down to 0 degrees, everything works! Immediately before, there is no description of this driver anywhere and ask me to give the circuit diagram clearly.

Optics: I offer buyers two options, either thick (~3mm) or thin (~1mm). Who needs it for light effects, take it from the product, or it will cost less. And for weeding, burning and caution, they buy me from a thin exchange. A laser with a thin ignite canisters, melting plastic, a DVD box in just a few seconds! All you can do is look at the video at the end of the article.

Zhivlennya: To power the laser, 3 AAA elements (rechargeable batteries or rechargeable batteries) are required, which guarantees constant power. When the batteries are alive, the tension continues for about half a year, then gradually decreases. With batteries (due to their larger capacity), the operating hour is again 4 times longer.

Kozhen iz us held a laser pointer in his hands. Regardless of the decorative nature of the product, it contains a high-quality laser based on a conductor diode. The same elements are installed on laser levels.

The latest popular video, collections on your browser - the DVD burner of your computer. This one has a stronger laser diode installed, which has a thermal effect.

This allows you to burn the disk ball, leading to a new track with digital information.

How does a conductor laser work?

Devices of this type are inexpensive from manufacturers, the design is simple. The principle of laser (superwire) diodes is based on the vicor of the classic p-n junction. It performs the same transition as in standard light-emitting diodes.

There is a difference in the organization of prominence: light diodes propagate spontaneously, but laser diodes are suppressed.

The fundamental principle of the formation of the so-called population of quantum vibration is formed without mirrors. The edges of the crystal are chipped with a mechanical way, ensuring the effect of breaking at the ends, on the mirror surface.

To obtain a different type of transition, you can use “homojunction”, if the conductors are different, or “heterojunction” with different transition materials.


The laser diode is available in an accessible radio component. You can buy it in stores that sell radio parts, or you can get it from an old DVD-R (DVD-RW) drive.

Important! A simple laser, such as is used in light-colored pointers, can seriously damage the reticle of the eye.

More tightening settings, which should be ironed instead, can reduce the appearance or cause damage to the skin. Therefore, when working with such devices, exercise extreme caution.

If you have such a diode in place, you can easily prepare a powerful laser with your own hands. In fact, the purchase may not be cost-free, but it will cost you a ridiculous amount of money.

DIY laser from DVD drive

To start, you need to get the drive itself. You can get it from an old computer, or you can get an additional fee for a symbolic contribution to the flea market.

This scheme, which is quite accurate and does not require a large number of components, is intended for laser diode treatment and is divided into components that appear to have medical significance. Each device undergoes clinical testing. The characteristics of laser diodes vary from short- and long-lasting drift, due to temperature and age. If they are treated with a constant stream, then their output optical tension should be monitored and, obviously, before changes, the stream should be adjusted.

The housing has a grounding structure, so the configuration of the steady-state jet is protected by switching on the power transistor at the upper arm of the laser, and what is more, the simplest option is the last option. In addition, in order to avoid the “tattoo” of the patient, there will be some initial marks.

In a circuit with unipolar live +5 V resistor R1, which vibrates and interconnects the string, and p-channel MOSFET Q1 create a historical repeater (Malyunok 1). The gate of the MOS transistor is under voltage, which slightly exceeds the voltage of the turn, so the transistor is frequently turned on, and the laser diode stream creates a voltage drop across resistor R1. In the worst case, when Q1 is open all the way, the maximum laser beam is indicated by

R DS(SAT) = 25 mOhm - the reference of the open-channel MOS transistor,
V LASER = 2.0 V – voltage on the laser diode.

The values ​​of R DS(SAT) and V LASER were taken from the subconductor data on the transistor and laser diode output. The value of the resistor R1 is adjusted to the value of the laser flow (in this case, 250 mA) with a correction made by the direct voltage of the laser diode, typically a value of 2.0 V. 1, omit:

de I LASER = 250 mA.

There is little support for the R DS(SAT) table, so you can’t help it. At the given values ​​of R1 and the maximum laser output, the intensity that is dissipated by R1 can be calculated using the formula

It is clear that a resistor with a permissible voltage of 800 mW, which is turned off, ensures a small additional reserve.

The laser beam value is set behind an additional DAC, the output voltage of which is calculated ratiometrically. Since the reference voltage is set to +5, the output of the DAC monitors all life fluctuations. During the hour of operation, the required value of the voltage that controls is installed at the output of the ADC. Dialer R2, R3 scales this setpoint to the nominal life +5 Art.

For example, if the output voltage of the DAC is set to equal half of the scale, then +2.5 V, the voltage between R2 and R3 (or at the non-inverting input of op-amp IC1) will be +3.5 V. Included in the gate circuit, IC1 regulates the voltage shutter Q1 and Apparently, the stream must pass through R1, Q1 and the laser diode. The circuit mode stabilizes when the gate voltage becomes equal to +3.5 V. In this mode, resistor R1 drops 5 V - 3.5 V = 1.5 V, and the voltage reaches 125 mA, so it is in the middle of the scale. Similarly, if the output of the DAC is set to a minimum value of 0 V, the voltage at the input, which does not invert, IC1 will be +2 V. IC1 will increase the voltage at the gate of Q1 until the voltage drops on R1 not up to 3 V, but flow, obviously, up to 250 mA. This is the point at which Q1 is open, and the direct voltage on the laser diode is +5 minus the voltage drop on R1.

In the new circuit, elements R4 and C1 are included, which ensures stability of the control circuit and changes the frequency at f, which is similar to the previous one.

I would like to note the trace of the process that occurs in the circuit during a wave-like change in the voltage, such as an op-amp, which works as a summator of the voltage settings and the gate connection, becomes a repeater of the voltage, yogo exit pragne viniknut shodenka. In connection with this, in our application we add capacitor C2, which filters the low-frequency voltage filter settings depending on the frequency

de R2||R3 = 12 kOhm.

Since the frequency of the visual filter will be much lower due to the transmission of the OS, the op-amp can set the stages of changing the settings with minimal inputs during the DAC re-micking time.

R5 ensures that the op-amp has been removed so that a small amount of current will always flow through resistor R1. If a full-scale voltage of +5 V is installed at the output of the DAC, the laser stream, which is set by the operational booster, is always a little more sensitive to the value that is set by the setting. Therefore, the output of the op-amp, when you turn on Q1, enter until it is full. Without resistor R5, the input bias voltage of the op-amp could be taken as a different set value and would result in the balance being updated before Q1 was turned on.

This is one of the main reasons, through which the DAC is turned on ratiometrically. If the reference voltage of the DAC was fixed, programming small streams would be practically impossible. If you set the voltage at the output of the DAC a little lower than the exact value of +5 V, then with small fluctuations in the supply voltage +5 V the voltage that controls will change even more. However, in the ratiometric DAC circuit, the supply voltage changes +5 V, and the voltage that controls its output is not stable.

The price for the ability to accurately define weak currents is a poor coefficient of strangulation by the pulsation of life. However, for the medical supplement for which a laser is prescribed, the struma stabilization loop itself is partly the stabilization loop of tension and pulsation of life in it is minimal. If necessary, a small voltage stabilizer can be added to the board, and at the cost of a significant increase in the number of components, you get a more stable, low-noise operation of the laser.

In this post I will describe how I took the purple laser pointer from the moth that I had at hand. For what I need: a violet laser diode, a collimator for combining the light beam, driver parts, a housing for the laser, a life-saving device, a hot soldering iron, straight hands and a lot of creativity.

Those who are stuck and want to tinker with electronics - please contact me.

Having pressed the jammed Blu-ray cutter under my hand. Vikinuti bulo Skoda, but I don’t know what else you can earn. After a short while of watching the video, who was shown such a self-contained “toy”. Here and the blues for the future!

The read-write system of the drive has a laser diode. The vein in most episodes looks like this:

Or so.

To liven up the “red” voltage, you need 3-3.05 volts, and from 10-15 to 1500-2500 milliamps under pressure.
And the “violet” diode axis generates as much as 4.5-4.9 volts, so it is impossible to live through a resistor from a lithium battery. Get a driver.

Since I have a positive result from the ZXSC400 microcircuit, I chose it without hesitation. This microcircuit is a driver for high-pressure LEDs. Datashit. With regard to the appearance of the transistor, the voltage and the inductance, I won’t get too wise – I’ll go with the datasheet.

I prepared a board for the laser driver using the knowledge of a large number of LUT (Laser Technology) radio amators. What is a laser printer for? The scheme is painted in the SprintLayout5 program and placed on the float for further transfer of the little one to the textolite. The melt can be carefully handled so that it does not get stuck in the printer and is clearly pressed on it. It is ideal for melting plastic envelope folders.

Since there is no spitting, there is no need to get embarrassed! Apparently a friend or friend has a women's glossy magazine, it looks like it's on the right side and adjusts it to A4 size. Then another thing.

In the photo below, you can mix the melt with the applied toner in the form of diluting the circuit and preparing before transferring the toner onto the textolite. The next step will be the preparation of textolite. It’s better to take a small piece of paper, twice as large as our pattern, so that it can be pressed more firmly to the surface before the time of the day. The copper surface must be sanded and defatted.
Now we need to move the babies. We know we put some powder in the cupboard, let’s mix it up. While it is heating up, we place a piece of paper with a diagram on the textolite.

As soon as the powder heats up, you need to carefully pass the melt through the papier.

This video has a clear indication of the process.

If it sticks to the textolite, you can mix the powder and proceed to the next step.

After transferring the toner with additional initial sanding, the area on the right looks like this:

If some parts of the track were not transferred, or were not transferred very well, they can be corrected with a CD marker and a sharp tip. It is necessary to vikorize the slope, the tracks should be finer, less than 0.4 mm. The board is ready before etching.

Poisonous by chlorine salt. 150 rubles per jar, lasts forever.

We sort out the items, throw in our prepared ingredients, “mix” the payment and check for the result.

Don't forget to control the process. We carefully pull the board together with tweezers (it’s better to buy one, so we can spare ourselves the nasty mat and “snot” of solder on the next board when soldering).

Well, the board has been damaged!

Carefully clean with fine sandpaper, apply flux, and seal. What to do after servicing.

On the contact pads, you can apply a little more solder, lower down, so that the parts can be soldered more easily, and without applying additional solder.

Select the driver for this circuit. Return to respect: R1 - 18 milliohm, but not megaohm!

When soldering, it is best to sharpen the soldering iron with a thin tip; for ease of use, you can quickly use a thicker tip, and even add smaller parts. When soldering, flux LTI-120 is used.

Well, the board is practically soldered.

It is soldered in place of a 0.028 Ohm resistor, since we are unlikely to know such a resistor. You can solder in parallel 3-4 SMD jumpers (look like resistors, marked 0), they have about 0.1 ohm of real support.

If such people did not appear, then I would rely on the primary support for a similar support. Definitely not dying - without the fuss of any online calculator.

Testing.

The voltage is set to less than 4.5 volts, so the light is not very bright.

Surprisingly, the board looks rough before being stained with flux. Zmivati ​​can be forgiven with alcohol.

Now it’s time to write about the collimator. On the right is that the laser diode itself does not shine in a subtle way. If you turn it on without optics, then light it as a primary LED with a separation of 50-70 degrees. In order to do this, you need optics and the collimator itself.

Coloring machine from China. You must remove another weak red diode, otherwise you will not need it. The old diode can be knocked out with the primary M6 bolt.

We unscrew the collimator, twist the lens and the back part, and connect the driver to the diode. The fastenings that have been lost are squeezed into the breams. You can change the diode by hitting it.
The diode is broken.

Now it is necessary to apply a new violet diode.
It is impossible to press on the feet of the god, but otherwise it is not easy to press.
Why bother?
The back of the collimator is wonderfully suitable for this.
We insert the new one with the legs into the hole in the rear part of the cylinder, and press it into the flanges.
The blades are smoothly twisted so that the liquid is not completely pressed into the collimator.

Well, the driver and collimator are selected.
Now we attach the collimator to the head of our laser, and solder the diode to the driver outputs using additional wiring, or directly to the driver board.

As a corps, I bought a simple lighter from a government store for a hundred rubles.
It looks like this:

All slots for laser and collimator.

There is a magnet on the clip for easy fastening of the accumulators.
It was impossible to insert the laser device into the housing and tighten it.

Sprint layout 5, card layout files

Everyone, of course, needs to know laser pointers. Such inserts do not shine and do not have a heating effect. It’s not surprising that its optical power is only 1 mW (maximum 5 mW). The author wants to create a high-tension laser, rather than the classic laser but even more complex, so he did it the other way.

Three faulty CD-RW drives were discovered. Lasers in them, as a rule, operate at 100 - 250 mW in pulsed mode, and 50 - 125 MW in continuous mode. Perform in the infrared range at a maximum of 780 nm. Middle working stream 100 mA – 150 mA, pulse up to 200 mA. When connecting a diode, it is better not to risk and adjust the flow of the lancus with a life of approximately 100 mA (more is possible, otherwise there is a risk of destruction of the diodes, which is why it is important to install this type). The voltage drop across the diode is approximately 2.1 – 2.15 V. To interchange the current, you can use a resistor. This is not a perfect solution, but it works. It is better, of course, to set the life cycle with a stabilized strum with 7805 or LM317.

In the original design of the laser device, the laser beam is focused from a decimal mm distance, there are two lenses: the first converts the diode light into a parallel beam, the other focuses it on the desired Get out. Such a method is not suitable for experiments; it requires minor processing.

There are two possible solutions:
1) Remove the laser diode and mount the optics from another device (laser printer. This is only suitable for laser diodes with large housings with a diameter of 5.6 mm, which are compatible with third-party optics).
2) By removing the laser diode in the original part, one of the lenses (closest to the CD) is removed. The other lens is shifted in the same direction and focused at the desired location (1 cm to 1 m or more).
The laser diode must be coupled with the lens, otherwise you will not be able to focus the beam. The laser diodes are not to blame for being turned on, since they are not placed in a large metal housing that serves as heat dissipation!

Those that can be found in various devices for recording discs: DVD-RW drives have 2 laser diodes: a red one for burning DVDs and an infrared one for burning CDs. DVD-ROM drives (readable only) can only use a weak 1 mW red LED, which is good only for designing inserts. The stench cannot be ignited or detected. For CD-RW/DVD-ROM combinations (burning CDs and only reading DVDs), you can find the infrared and low-red diode (like DVD-ROM). And, please, download the CD-ROM, what should you read, absolutely :).

Respect! Laser LEDs from CD-RWs are subject to invisible laser degradation, and they are no longer safe! This light may harm your eyes. You don’t have to worry about working without a lens or pointing it out on the surface that’s shaking. The laser flash may cause burns or burns. Tse zazvichiy laser class III b. Everything you do, you do at your own risk.

The simplest way is to connect a laser diode.

Laser diode connections

R = (U-Ud)/I

The support of the laser diode series (voltage U is taken to be 1 V lower than the voltage drop Ud on the laser diode. The voltage drop Ud is 2.15 V for infrared and 2.5 V for worm diodes. I will not install please laser diode stream higher for 0.2 A.

Note: If the diode is connected to any device (regulated) without a support or regulator, the diode will be reduced! The laser diode is near zero. A voltage drop of 2.1 does not mean that the voltage can be connected up to 2.1 V!