Microphone pidsiluvach on microcircuits (017). Front mount for microphone Front mount on microcircuits 4558

Scheme of a self-contained front podsiluvach (preamp) with a timbre block, chimes on an LM4558 microcircuit. An important part of the audioopidsiluvach is the anterior pidsiluvach. Bazhano, schob vіn mіg not only sill the signal, but also regulate the frequency response.

On the little one on the right, a scheme of a clumsy frontal stereopatch with adjustable thickness is directed separately in the skin channel and with a voice in both channels, timbre control for low, middle and high frequencies.

Schematic diagram

Scheme of a vikonan on a double operational substation type LM4558. І recognized by us as a front for work with cars simple pіdsiluvachami inspired on microcircuits - integrated bridge UMZCH. That's why the voltage of life is "automobile" - unipolar 12V.

However, the sphere of stosuvannya given schemes is not limited to automotive technology.

Rice. one. Schematic diagram self-contained front support with tone block on LM4558.

The voltage of life can be up to 30V. You can switch to bipolar eating. For which it is necessary to pick up a dilnik on resistors R1, R2 and C2. And the visnovki 3 and 5 microcircuits are a big minus for eating. At the same time, 4 vydklyuchiti vіd minus livelihood and tax on the new negative voltage of livelihood.

Thickness regulation is controlled by changing resistors R7 and R15, as it is said, about the skin channel. On the operational sub-circuits of the A1 microcircuit, two active tone controls are broken, in which they act as an amplification of the audio signal, and frequency correction for the additional tri-switch tone controls.

Lances of regulation are included in the lances of the OOS of operational subsidiaries. Adjustment of the loudness for high frequencies - with a double change resistor R8, for mid frequencies - R9, according to low frequencies- R10.

Details

The LM4558 microcircuit can be replaced by any kind of IMC - two op-amps of a wild zastosuvannya or a circuit for two IMCs, one op-amp for the skin.

Microphone pidsiluvach. (017)

Let's take a look at the design of a high-pitched microphone microphone. Pіdsilyuvach zіbrany on the operating pіdsilіvаchі VA4558 letter designations, the essence does not change). This microphone is designed to control the sound environment in the premises, on the streets, as an addition to the video warning system, to protect and protect security. The scheme has a high sensitivity, low level of noise. surgical paramedic, ensuring a clear sound on monitors, recording attachments, head phones, may lower the strum, showing the strum close to 2mA), effective when the voltage is reduced to 4.5 volts. When repeating the circuit with the method of minimizing the dimensions of the attachment, you can replace the microphone capsule with a smaller one with a minimum size (close to 3 mm), do not switch the socket, change the type of microcircuit in the CMD viconann, replace the non-polar capacitors of the capacitors. Acoustic range - up to 7 meters, the length of a good line in the air to support the signal (headphones, monitor, recording device) - up to 300 meters. Zhivlennya vіd dzherel fast strumu voltage 5 - 12 volts. As a substitute for an electret microphone, a studio (dynamic) microphone should be installed, the resistor for livening an electret microphone R1 from the circuit must be turned off. Vrahovyuchi, scho microchip to store two identical subsidiaries in its warehouse, the other subsequence (visnovki 5,6,7) can be set for another channel, or it can be played as a front subsilience for the first channel. As a substitute for a dynamic microphone, connect a coil to the entrance,wound on a ferite shear and place about 3,000 turns of a thin (0.08 - 0.12 mm) mid-range wire of the PEL, PEV, subsiluvach type to transform into a radio receiver of an over-low range of a radio wave, supported by speakers of telephones, televisions, telephone wires. If it is not possible to connect to the power supply with a wired line, you can add power to the power supply with a radio-supported switch, selected on one VT1 transistor, which is a low-power RF generator, which works in the radio range of 88 - 108 MHz. Substroyuvalny capacitor C6 allows you to change the frequency of the generator, adjusting to the desired frequency. It is also possible to change the frequency of stretching / squeezing the coils of a frameless coil L1, wound with a medium dart with a diameter of 0.4 - 0.7 mm on a mandrel 3 - 4 mm (for example, on the drill shank) and sweep 6 turns. If you want to supplement the circuit with a high-frequency power supply on an ever-changing high-frequency transistor (for example, KT361, the diagram shows it in blue color and the kit is not included), then the distance of the call can reach 1 km, but it can also be used in accordance with the current legislation. Antenna can serve as an antenna for a mid-mounting dart 50 - 80 cm.
Adjustment of the radio microphone to switch on at the right frequency and to switch the radio receiver in the range of 88 - 108 MHz.

Most audio enthusiasts are categorically and not ready to compromise when choosing equipment, rightly respecting that the sound that is received is the responsibility of the clean, strong and hostile. How can one reach?

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Pidsiluvach on microcircuit f4558

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Mabut, the main role of the virishennі tsgogo pitannja zіgraє vibrіr pіdsilyuvacha.
Function
Pidsilyuvach vіdpovіdaє for the yakіst and the intensity of the sound. When buying a product, pay attention to the following signs, which signify the introduction of high technologies in the production of audio equipment:

• Hi fi. Ensures the maximum purity and accuracy of the sound, elevating it from external noises and creating.
• Hi end. The choice of a perfectionist who is ready to pay a small price for the satisfaction of distinguishing the most important nuances of his favorite musical compositions. Often, manual selection equipment is brought up to the category.

Technical characteristics, on the basis of the following signs of respect:

• Exit that exhaustion. The most significant may be the nominal indicator of the exhaustion, because regional values ​​are often unreliable.
• Frequency range. Variable from 20 to 20000 Hz.
• Coefficient of non-linear creations. Everything is simple here - the smaller, the better. The ideal value, according to experts - 0.1%.
• Spivv_dshennya signal and noise. Modern technology transmits the value of this indicator over 100 dB, which reduces third-party noise to a minimum for an hour of listening.
• damping factor. Vіdbivaє vihіdniy opіr pіdsilyuvacha yogo spіvvіdnoshnі z nomіnalnym navantazhennya reliance. In other words, a sufficient indicator of the damping factor (more than 100) replaces the vindication of non-essential vibrations of the equipment only.

Memory slide: preparation yakіsnih pіdsilyuvachiv- laborious and high-tech process, obviously, even a low price for good characteristics is to alert you.

Classification

Schob rozіbratisya at vsomu raznomanіttі propozitsіy market, prіbno razrіznyat goods according to raznimi criteria. Subsidiaries can be classified:

• For pushing. The front one is a kind of intermediary lane between the dzherel sound and the final pidsiluvache tightness. Podsilyuvach tightness, at his desk, vydpovida for the strength of that thickness signal at the exit. At once, the stench will satisfy the new pidsiluvach.

It is important: the first transformation of the signal is seen by itself in the front pods.

• According to the elemental basis, lamps, transistors and integrated ROZUM are distinguished. Remain vinicli with the method of combining excellence and minimizing the first two, for example, like the sound of tube subsidiaries and the compactness of transistor ones.
• Behind the regime of robots, subduers are subdivided into classes. The main classes are A, B, AB. As for class A, vicory has rich energy, but you can still see a high-pitched sound, class B is accurate to the last, class AB is the optimal choice, which is a compromise to the strength of the signal and to achieve a high CCD. Classes C, D, H and G are also distinguished, which winkli from zastosuvannyam digital technologies. Also, single-cycle and double-cycle modes of the robot and output cascade are divided.
• For a number of channels, subsiluvachs can be one-, two- and rich-channel. Stay active in home cinemas to mold the volume and realism of the sound. Most often, two-channel audio is used for both right and left audio systems.

Respect: the development of technical warehouse purchases, especially, necessary, and most importantly, the most important factor is the elementary listening of equipment for the principle of sounding or not sounding.

Zastosuvannya

Vibіr pіdsilyuvacha is more important than priming with goals, which we buy wine. Pererakhuem the main spheres of vikoristannya pіdsilyuvachіv sound frequency:

1. At the warehouse of the home audio complex. Obviously what best choiceє lamp two-channel single-cycle in class A, also the optimal choice can become three-channel class AB, de one channel for the subwoofer, with the Hi-fi function.
2. For acoustic system in the car. The most popular chotyricanal pіdsilyuvachі AB or D class is suitable for the financial possibilities of the purchase. In cars, the crossover function is also needed for smooth frequency regulation, which allows, if necessary, to see the frequency in a high or low range.
3. At concert equipment. To the extent that the feasibility of professional equipment is primed, there are greater heights of power through the great expanse of breadth sound signals, as well as a high demand in intensity and trivality of vikoristannya. In this rank, it is recommended to take a bath with a class of not lower than D, a customary practice mayzhe on the middle of your tightness (70-80% of the declared), bagged near the building with high-tech materials, which protects from negative weather and mechanical effusions.
4. At the studio equipment You can add the largest range of frequencies - from 10 Hz to 100 kHz versus from 20 Hz to 20 kHz in a single substation. Note also the possibility separate regulation richness on different channels.

In this way, in order to spend a long time enjoying yourself with a clear sound, do not forget to remember all the different propositions and choose the option of audio equipment that best suits your needs.

The author of this circuitry is good friend Maestro, having developed the scheme of the birth of the rock, and having published it in one of the issues of the radio magazine. The postal version of the circuit showed good parameters and high stability of the robot, so for a couple of years the circuit was fully completed by the combined forces of radioamators.

Bula added stabilization on the varicap, as well as replacing the sprat of the components of the frequency-setting lance, adding a loop capacitor for manual adjustment to the required range. A high-yield microphone was added. Zahopivsya tsієyu scheme vseryoz і rasrobiv kіlka modifications.

The first version is suitable for transmitting a signal on a distance of 150 meters. Drukovana fee The postal version of the bugs was painted by hand, with custom manicure and toothpicks.

Element base

Microcircuit BA4558 is used for different markings, less attention is paid to writing 4558. The microcircuit is issued in 8 different cases. Resistors and capacitors were soldered motherboards computer and type of digital devices. It is a pity that there is no marking for SMD capacitors, so it is necessary to vikoristovuvaty virіryuvach єmnostі kondensatorіv or a digital multimeter with such virіryuvach. In the extreme case, you can use variable capacitors.

For low-power versions of raju in UHF transmission, use imported high-frequency transistors of the S9018 series. The transistor can be marked as SS9018, C9018 or 9018.

At the transmitter, it is not necessary to use the traditional transistors, having shown that with a similar KT368 reception, it is an order of magnitude higher.
Contour - wind with a dart 0.6-0.8mm ( optimal option 0.7 mm) on a frame 4 mm and leave 8 turns from the openings in the middle. For the cob on the frame, wind 8 turns, then we read 4 turns and take the varnish. Cleaned with a varnish, the place is soldered with a piece of a single-core dart of the same diameter as the cat (providing a bazhan denudation)

The process of folding and adjusting the circuit does not take a lot of time, only after folding the cob version of the circuit, adding to the design of stabilization and UHF. On all his versions of the victorist, having the same microphone subs, promptings on the BA4558 microcircuit. Microphone zvichaynisinky - a capsule from the Chinese priymach and induce sensitivity with him close to 5-6 meters, with which the transmission of the sound is clear, so you can speak near the microphone. Such parameters of the bug give the possibility of victoring an attachment like a remote microphone for karaoke, thereby creating a couple of such attachments for a conference.

The frequency has decreased insignificantly: at a distance of 10-100 meters from the receiver, the frequency floats by only 0.1 MHz!

Dekіlka happy zі sbirannya

Scheme bazhano work on SMD, so drastically changes the scope of the radio microphone, it was chosen a few versions, including the most important components, from the SMD of everyday zbudiv that noise at the receiver was not posterigav.

Antenna is shorter than robit with a bagatozhenny drotu in іsoljatsії, drotu diameter 0.5-0.7 mm.

The varicap is taken from the antenna unit of the old-fashioned TV, but it is possible to vicore practically any analogous varicap, in my opinion of the KV121A varicap.

Place the ready bug in a metal case, which will immediately play the role of the screen, minus the bug soldered onto the case.
Take the microphone yourself, like mine, you can easily buy it on the radio, with microphones like style telephones and a headset, the sound is not voluminous, more predicting the directions of the microphone and the deuce fragments of the movement are important to sort out. Natomist mikrofon vіd mobile phone vidminno pidide in that vein, yakscho chooses to vicorist an attachment like a microphone for karaoke.

The high stabilization of the circuit allows you to take attachments in your hands, with which in the signal that is being transmitted, it will not happen, so the antenna does not hang around. With the method of changing the length of the antenna, you can take the paste in the form of a helium pen and wind the spiral antenna. For this, a single-core drіt is taken with a diameter of 0.6-0.8 mm and a length of 40-50 cm and evenly, a coil to a coil is wound along the length of the frame (graze like handles). After winding the paste, you can clean it up, and place the spiral antenna in a plastic tube of a large diameter.

First launch

If the scheme is chosen again, it is connected to the zherel zhivlennya. For the cob of bazhano vikoristati, I use a crown of 9 volts. At the plus of life, a miliammeter is connected, or a digital multimeter in the mode of vimiruvach strum. Correctly selected bug lives close to 10-13mA, in some fluctuations up to 15mA. Let's help for the help of the RF detector, we will re-verify the industry.

For which one, the detector antenna is close to the beetle antenna so that there is a gap of 0.5-1 cm between them. The arrow of the detector is to blame, if it doesn’t appear, then stick the detector antenna with the collector of the transmitting transistor - the arrow is to blame for the wind, as if the bug is working.

Before folding, turn over all active components for use, remember that the rest were bought from the store, that is. new.
Yakshcho viprominyuvannya є, then turn up the radio receiver for an hour. The beetle with such elements in the frequency-setting lancet sounded at frequencies of 94-98 MHz, 4 specimens were selected in the case, all were caught at frequencies of 96-98 MHz.

The first version of the circuit without UHF pierced 130 meters for the reception of a large mobile telegon, for the life of the crown, the rest of the power (7.8 Volts)

Another version with UHF on low-voltage S9018 uses 20-27mA, breaks through a clear 300 meters - it was specially checked, having received a signal on the same receiver from a mobile phone.
On the third version of the screen - having changed it with an imported transistor at 300 MHz, the 68mA circuit slowed down, breaking through 500 meters, but not the boundary for the third version, with the transistor assigned to the circuit, it can easily penetrate 1 km.

Like a case, I made a cold casing of a Chinese electronic transformer for 30-50 watts.

Part of the transmission for stability is filled with paraffin.

Without podsilyuvacha HF bug easily pierces 100-130 meters through concrete walls, so this bug is entirely adventitious for listening or storing food.

Nasamkinets want to say that I have tried a lot of radio bug schemes in medium and high folding, good schemes with quartz stabilization are not available, and simple schemes not stable, but the range is in the range of 10-50 meters, this circuit is not surprised by the simplicity of the signal, which is transmitted, stability and distance, so that no one was doubtful of taking one of the first relatives from their test far-reaching beetle.

List of radio elements

Pіdsilyuvach for mikrofonu, but the frontal booster or the microphone for a microphone is such a type of booster, which is recognized as - strengthening a weak signal up to a linear level (about 0.5-1.5 volts), then up to a reasonable value, with such a pracciut zvichayut potuzhnist.

With the input jack of acoustic signals for the front sounder, sound the sounder of vinyl records, microphones, and the sounder of other musical instruments. Below there are three schemes of microphone inputs on transistors, as well as a variant of a microphone input on microcircuits 4558. All of them can be easily taken with your own hands.

Scheme of a simple microphone pidsiluvach on one transistor

The scheme of a microphone microphone is given, working with both dynamic and electric microphones.

Dynamic microphones are similar in design to the Guchnomovts. Acoustic fluff is poured onto the membrane and onto the acoustic coil attached to it. At the moment of cleavage of the membrane, in the coil, under the influx of the magnetic field of the permanent magnet, an electric stream is established.

The work of electric microphones is based on the ability of singing types of materials to change the surface charge under the influence of acoustic whistle due to the introduced dielectric penetration (electricity). Tsey type The microphone sounds like a dynamic high input support.

When using an electret microphone to change the voltage on the microphone, it is necessary to install Opir R1

Oskіlki tsya scheme mikrofonnogo pіdsiluvachа dynamic mikrofon, then at vikoristanny electrodynamic mikrofon yogo opіr may be in the range of 200 to 600 ohms. For C1, it is necessary to set up to 10 microfarads. If there will be an electric capacitor, it is necessary to connect a kill transistor.

Animation zdіysnyuєtsya in the battery krone or in the form of a stabilized dzherel zhilennya. Wanting a shorter type of battery to reduce the noise. you can replace it with a marriage. Electrolytic capacitors for a voltage of 16 volts. In order to stop the transitions, connect the switch to the signal to the signal, and before the input of the switch it is necessary to use a shielded dart. If you need to go further away, stronger sound, you can pick up the sound on the microcircuit.

Microphone front podsiluvach on 2 transistors

The structure of the stimulus, whether it be a subdued one, is even more infused with its noise characteristics. Even if we take into account the fact that victories in the circuit of the subsilver and radio components, everything in this other world leads to silence (noise), then it is obvious that the single vihіd should take away the larger and smaller microphonic components of the radio circuit. With a butt, a two-stage frontal scheme can be stepped on.

For this option, the number of different capacitors is reduced to a minimum, the chips of the transistor are connected behind the circuit from a hot emitter. Also, between cascades there is an uninterrupted link. For stabilization of the robot circuit mode, with a change in the outside temperature and the pressure of life, the environmental protection system was added to the circuit according to the constant stream.

Tripod for electret microphone on three transistors

That's one more option. The peculiarity of this circuit for the microphone is that the supply of life to the circuit for the microphone is carried out by the conductor itself ( phantom eating) as the input signal.

Danish microphone pіdsilyuvach appointments for sleeping room h, for example, MKE-3. The voltage of life on the microphone goes through the opir R1. The audio signal from the microphone output goes to the base VT1 through the capacitor C1. , What is built up from the supports R2, R3 is created necessary on the basis of VT1 (approximately 0.6). Strengthening the signal from the resistor R5, which acts as a bias, goes to the VT2 base, which is part of the emitter repeater on VT2 and VT3.

For rose output, two additional elements are installed: the input voltage R6, through the wire, and the expansion capacitor SZ, which leads to the output audio signal from the voltage of the live.

Front microphone on microchip 4558

Operational pilot 4558 is manufactured by ROHM. Vin is characterized as a low-power and low-noise pidsiluvach. The microcircuit is installed in the substation of the microphone, sound podsiluvachiv, active filters, generators with electric voltage Chip 4558 can have internal phase compensation, lower input voltage thresholds, high power factor and low noise level. Also, this operating podsiluvach may zahist in the form of a short zamikannya.

(140.5 Kb, vanquished: 2485)

Tse garniy option for everyday use of a microphonic substation of a microcircuit. Scheme for subscribing to the microphone high quality strength, simplicity and vimagaє great tying. This microphone microphone for a dynamic microphone also works well with electric microphones.