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Connecting old color music to a music center. Homemade color music from LEDs. Simple circuit with one lamp

The inexhaustible potential of LEDs has once again been revealed in the design of new and modernization of existing color and music consoles. 30 years ago, color music, assembled from multi-colored 220-volt light bulbs connected to cassette recorder. Now the situation has changed and the function of a tape recorder is now performed by any multimedia device, and instead of incandescent lamps, super-bright LEDs or LED strips.

The advantages of LEDs over light bulbs in color music consoles are undeniable:

wide color gamut and more saturated light;
various design options (discrete elements, modules, RGB strips, rulers);
high response speed;
low power consumption.

How to make color music using a simple electronic circuit and make the LEDs blink from the source audio frequency? What are the conversion options? sound signal exist? Let's look at these and other questions using specific examples.

The simplest circuit with one LED

First you need to understand a simple color music circuit, assembled on one bipolar transistor, resistor and LED. It can be powered from a DC source with a voltage of 6 to 12 volts. This color music works on one transistor according to the principle of an amplification stage with a common emitter. A disturbing influence in the form of a signal with varying frequency and amplitude arrives at the VT1 base. As soon as the oscillation amplitude exceeds a certain threshold value, the transistor opens and the LED flashes.

The disadvantage of this simplest scheme is that the rate of blinking of the LED depends entirely on the level of the sound signal. In other words, a full-fledged color-musical effect will be observed only at one volume level. Lowering the volume will result in a rare wink, while increasing the volume will result in an almost constant glow.

Scheme with single-color LED strip

The simplest color music above on a transistor can be assembled using an LED strip in the load. To do this, you need to increase the supply voltage to 12V, select a transistor with the highest collector current exceeding the load current and recalculate the resistor value. This simple color music from an LED strip is perfect for beginning radio amateurs to assemble with their own hands, even at home.

Simple three-channel circuit

A three-channel audio converter allows you to get rid of the shortcomings of the previous scheme. The simplest scheme of color music with the division of the sound range into three parts is shown in the figure.
It is powered by a constant voltage of 9V and can illuminate one or two LEDs in each channel. The circuit consists of three independent amplifier stages assembled on KT315 (KT3102) transistors, the load of which includes LEDs of different colors. As a pre-amplification element, you can use a small step-down network transformer.

The input signal is fed to the secondary winding of the transformer, which performs two functions: galvanically isolates the two devices and amplifies the sound from the line output. Next, the signal goes to three parallel-connected filters assembled on the basis of RC circuits. Each of them operates in a specific frequency band, which depends on the values of resistors and capacitors. The low-pass filter passes sound vibrations with a frequency of up to 300 Hz, as indicated by the blinking red LED. Sound in the range of 300-6000 Hz passes through the mid-pass filter, which is manifested in the flickering of the blue LED. The high-pass filter passes a signal whose frequency is greater than 6000 Hz, which corresponds to the green LED. Each filter is equipped with a trimming resistor. With their help, you can set the uniform glow of all LEDs, regardless of the musical genre. At the output of the circuit, all three filtered signals are amplified by transistors.

If the circuit is powered from a low-voltage DC source, then the transformer can be safely replaced with a single-stage transistor amplifier.
Firstly, galvanic isolation loses its practical meaning. Secondly, the transformer is several times inferior to the circuit shown in the figure in terms of weight, size and cost. Scheme simple amplifier audio frequency consists of a KT3102 transistor, two capacitors that cut off the DC component, and resistors that provide the transistor with a common emitter mode. Using a trimmer resistor, you can achieve overall amplification of a weak input signal.

In the case when it is necessary to amplify the signal from the microphone, an electret microphone is connected to the input of the previous circuit, applying potential to it from the power source. Two-stage circuit preamp shown in the figure.
In this case, the trimming resistor is located at the output of the first amplifier stage, which gives more opportunities for adjusting sensitivity. Capacitors C1-C3 pass the useful component and cut off D.C.. Any electret microphone is suitable for implementation, for normal operation which requires a bias of 1.5V.

Color music with RGB LED strip

The following circuit of a color music console operates on 12 volts and can be installed in a car. It combines the main functions of the previously discussed circuit solutions and is capable of operating in color music and lamp modes.

The first mode is achieved through contactless control of the RGB strip using a microphone, and the second mode is achieved through the simultaneous illumination of red, green and blue LEDs at full power. The mode is selected using a switch located on the board. Now let’s take a closer look at how to make color music that is perfect even for installation in a car, and what parts are required for this.

Structural scheme

To understand how this works color music console, first consider its structural diagram. She will help you track full path signal passage.
The source of the electrical signal is a microphone, which converts sound vibrations from the phonogram. Because This signal is too small and must be amplified using a transistor or operational amplifier. Next comes the automatic level controller (AGC), which keeps the sound fluctuations within reasonable limits and prepares it for further processing. Filters divide the signal into three components, each of which operates only in one frequency range. In the end, all that remains is to amplify the prepared current signal, for which transistors operating in switching mode are used.

Schematic diagram

Based on the structural blocks, we can proceed to a consideration of the circuit diagram. Its general appearance is shown in the figure.
To limit current consumption and stabilize the supply voltage, resistor R12 and capacitor C9 are installed. R1, R2, C1 are set to set the microphone bias voltage. Capacitor C fc is selected individually to specific model microphone during setup. It is needed in order to slightly muffle the signal of the frequency that prevails in the microphone’s operation. Usually the influence of the high-frequency component is reduced.

Unstable voltage in the vehicle network can affect the operation of color music. Therefore, it is most correct to connect homemade electronic devices through a 12V stabilizer.

Sound vibrations in the microphone are converted into an electrical signal and, through C2, are supplied to the direct input of the operational amplifier DA1.1. from its output the signal goes to the input of the operational amplifier DA1.2, equipped with a circuit feedback. The resistances of resistors R5, R6 and R10, R11 set the gain DA1.1, DA1.2 equal to 11. The elements of the OS circuit: VD1, VD2, C4, C5, R8, R9 and VT1, together with DA1.2, are part of the AGC. At the moment a signal of too large an amplitude appears at the output of DA1.2, transistor VT1 opens and, through C4, closes the input signal to the common wire. This results in an instantaneous reduction in the output voltage.

Then the stabilized alternating current of audio frequency passes through the cut-off capacitor C8, after which it is divided into three RC filters: R13, C10 (LF), R14, C11, C12 (MF), R15, C13 (HF). In order for the color music on LEDs to shine brightly enough, you need to increase the output current to the appropriate value. For tape with a consumption of up to 0.5A per channel, medium-power transistors such as KT817 or imported BD139 without mounting on a radiator are suitable. If the do-it-yourself light-music assembly involves a load of about 1A, then the transistors will require forced cooling.

In the collectors of each output transistor (parallel to the output) there are diodes D6-D8, the cathodes of which are connected to each other and connected to switch SA1 (White light). The second contact of the switch is connected to the common wire (GND). While SA1 is open, the circuit operates in color music mode. When the switch contacts are closed, all the LEDs in the strip light up at full brightness, forming a total white stream of light.

Printed circuit board and assembly parts

To make a printed circuit board, you will need a single-sided PCB measuring 50 by 90 mm and a ready-made .lay file, which can be downloaded. For clarity, the board is shown from the side of the radio elements. Before printing, you must set its mirror image. Layer M1 shows 3 jumpers placed on the parts side.
To assemble color music from an LED strip with your own hands, you will need accessible and inexpensive components. An electret type microphone, suitable in a protective case from old audio equipment. Light music is assembled on a TL072 chip in a DIP8 package. Capacitors, regardless of type, must have a voltage reserve and be designed for 16V or 25V. If necessary, the board design allows you to install output transistors on small radiators. A terminal block with 6 positions is soldered on the edge for supplying power, connecting an RGB LED strip and a switch. A complete list of elements is given in the table. In conclusion, I would like to note that the number of output channels in a homemade color music set-top box can be increased as many times as desired. To do this, you need to divide the entire frequency range into a larger number of sectors and recalculate the bandwidth of each RC filter. Connect LEDs of intermediate colors to the outputs of additional amplifiers: violet, turquoise, orange. Do-it-yourself color music will only become more beautiful from such an improvement.

The given diagrams belong to the site cxem.net

Five-channel LED color music

Hello radio amateurs!

Like many beginners, the main problem was where to start, what my first product would be. Started with what I wanted to buy a home first. The first is color music, the second is a high-quality headphone amplifier. I started from the first one. Color music using thyristors seems to be a hackneyed option, so I decided to put together color music for LED RGB strips. I present you with my first job.

The color music scheme was taken from the Internet. Color music is simple, with 5 channels (one channel is white background). You can connect an LED strip to each channel, but for it to work at the input you need a low-power signal amplifier. The author suggests using an amplifier with computer speakers. I went from a complicated point, to assemble an amplifier circuit according to the datasheet on a TDA2005 2x10 W microcircuit. This power seems to me to be enough, even with a reserve. I diligently redraw all the diagrams in the sPLAN 7.0 program

Fig. 1 Color music circuit with an input signal amplifier.

In the color music circuit, all capacitors are electrolytic, with a voltage of 16-25v. Where it is necessary to observe polarity, there is a “+” sign; in other cases, changing the polarity does not affect the blinking of the LEDs. At least I didn't notice it. KT819 transistors can be replaced with KT815. Resistors with a power of 0.25 W.

In the amplifier circuit, the microcircuit must be placed on a radiator of at least 100 cm2. Electrolytic capacitors with voltage 16-25v. Film capacitors C8, C9, C12, voltage 63v. Resistors R6, R7 with a power of 1 W, the rest 0.25 W. Variable resistor R0 - double, with a resistance of 10-50 kohms.

I took a factory switching power supply with a power of 100W, 2x12v, 7A

On a day off, as expected, a trip to the radio market to purchase radio parts. Next task is to draw printed circuit board. For this I chose the Sprint-Layout 6.0 program. It is recommended by radio specialists for beginners. It is easy to study, I am convinced of this.

Fig 2. Color music board.

Fig 3. Power amplifier board.

The boards were manufactured using LUT technology. There is a lot of information about this technology on the Internet. I like it when it looks factory, so LUT did the parts too.

Fig 3.4 Assembling radio components on a board

Fig 5. Checking functionality after assembly

As always, the most “difficult” thing when assembling a radio circuit is to assemble everything into a housing. I bought the case ready-made at a radio store.

I made the front panel this way. I drew it in Photoshop appearance front panel where variable resistors, a switch and LEDs should be installed, one from each channel. Printed out the finished drawing inkjet printer on thin glossy photo paper.

I glue photo paper onto a degreased prepared panel with holes using wood glue:

Then I place the panels under the so-called press. For a day. As a press, I have a 15 kg barbell plate:

Final assembly:

Here's what happened:

Attachments to the article:

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Don’t forget to express your opinion on the competition entries and take part in voting for your favorite design on the site’s forum. Thank you.

Some suggestions for those who will repeat the design:
1. You can connect speakers to such a powerful stereo amplifier, then you get two devices in one - color music and a high-quality low-frequency amplifier.
2. Even if the polarity of connecting electrolytic capacitors in a color music circuit does not affect its operation, it is probably better to observe the polarity.
3. At the color music input, it is probably better to install an input node for summing signals from the left and right channels (). According to the author, judging by the diagram, the high-frequency color music channel (blue) is supplied with a signal from the right channel of the amplifier, and the remaining color music channels are supplied with a signal from the left channel of the amplifier, but it is probably better to supply a signal to all channels from the audio signal adder.
4. Replacing the KT819 transistor with KT815 implies a reduction in the number of possible LED connections.

Additionally

IN: I bought a tape with contacts G, R, B, 12 on it. How to connect?
A: This is the wrong tape, you can throw it away

IN: The firmware loads, but the error “Pragma message...” appears in red letters.
A: This is not an error, but information about the library version

IN: What should I do to connect a ribbon of my own length?
A: Count the number of LEDs, before loading the firmware, change the very first setting in the sketch, NUM_LEDS (the default is 120, replace it with your own). Yes, just replace it and that’s it!!!

IN: How many LEDs does the system support?
A: Version 1.1: maximum 450 pieces, version 2.0: 350 pieces

IN: How to increase this number?
A: There are two options: optimize the code, take another library for the tape (but you will have to rewrite some of it). Or take Arduino MEGA, it has more memory.

IN: Which capacitor should I use to power the tape?
A: Electrolytic. The voltage is 6.3 Volts minimum (more is possible, but the conductor itself will be larger). Capacitance - at least 1000 uF, and the more the better.

IN: How to check the tape without Arduino? Does the tape burn without Arduino?
A: The address strip is controlled using a special protocol and works ONLY when connected to a driver (microcontroller)
YOU CAN ASSEMBLE THE CIRCUIT WITHOUT A POTENTIOMETER! To do this, use the POTENT parameter (in the sketch in the settings block in the settings signal) assign 0. The internal reference voltage reference source of 1.1 Volt will be used. But it will not work at any volume! For the system to work correctly, you will need to select the volume of the incoming audio signal so that everything is beautiful, using the previous two setup steps.
Version 2.0 and higher can be used WITHOUT an IR REMOTE, modes are switched with a button, everything else is configured manually before loading the firmware.
How to set up another remote control?
Other remote controls have different button codes, use the sketch to determine the button code IR_test(versions 2.0-2.4) or IRtest_2.0(for versions 2.5+), available in the project archive. The sketch sends the codes of the pressed buttons to the port monitor. Next in the main sketch in the section for developers There is a definition block for the remote control buttons, just change the codes to your own. You can calibrate the remote control, but honestly it’s too lazy.
How to make two volume columns by channel?
To do this, it is not at all necessary to rewrite the firmware; it is enough to cut a long piece of tape into two short ones and restore the broken electrical connections with three wires (GND, 5V, DO-DI). The tape will continue to work as one piece, but now you have two pieces. Of course, the audio plug must be connected with three wires, and the mono mode is disabled in the settings (MONO 0), and the number of LEDs must be equal to the total number on the two segments.
P.S. Look at the first diagram in the diagrams!
How to reset settings that are stored in memory?
If you've played around with the settings and something goes wrong, you can reset the settings to factory settings. Starting from version 2.4 there is a setting RESET_SETTINGS, set it to 1, flash it, set it to 0 and flash it again. The settings from the sketch will be written to memory. If you are on 2.3, then feel free to update to 2.4, the only difference is the versions new setting, which will not affect the operation of the system in any way. In version 2.9 there was a setting SETTINGS_LOG, which outputs the values of settings stored in memory to the port. So, for debugging and understanding.

We all want a holiday from time to time. Sometimes you want to be sad or experience other emotions. The simplest and effective method achieve the desired result - listen to music. But music alone is often not enough - visualization of the sound flow and special effects are needed. In other words, we need color music (or light music as it is sometimes called). But where can you get it if such equipment in specialized stores is not cheap? Do it yourself, of course. All you need for this is a computer (or a separate power supply), several meters of LED RGB strip with a power consumption of 12V, a USB development board (AVR-USB-MEGA16 - perhaps the cheapest and simplest option), as well as a circuit diagram for , what and where to connect.

A little about the tape

Before moving on to the work itself, it is necessary to determine what exactly this 12V LED RGB strip is. And it is a simple, but at the same time very ingenious invention.

LEDs have been known for decades, but thanks to innovative developments they have become a truly universal solution for many problems in the field of electronics. They are now used everywhere - as indicators in household appliances, independently in the form energy saving lamp, in the space industry, as well as in the field of special effects. The latter also includes color music. When three types of LEDs - red (Red), green (Green) and blue (Blue) are combined on one strip, an RGB LED strip is obtained. Modern RGB diodes have a miniature controller. This allows them to emit all three colors.

The peculiarity of this tape is that all the diodes are grouped and connected into a common chain, controlled by a common controller (it can also be a computer if connected via USB, or a special power supply with a control panel for stand-alone modifications). All this allows you to create an almost endless tape with a minimum of wires. Its thickness can reach literally several millimeters (if you do not take into account options with rubber or silicone protection from physical damage, moisture and temperature). Before the invention of this type of microcontroller, the simplest model had at least three wires. And the higher the functionality of such garlands, the more wires there were. In Western culture, the phrase “unraveling the garland” has long become a common noun for all long, tedious and extremely confusing tasks. And now this has ceased to be a problem (also because the LED strip is prudently wound onto a special small drum).

What do we need?

DIY color music from tape GE60RGB2811C

Ideally, to organize color music with your own hands, we will use a ready-made LED strip powered by USB port computer. All we need is to download required application on the same computer, set up file associations with the desired audio player, and enjoy the result. But this is if we are very lucky, and if we have the money to purchase all this. Otherwise, everything looks a little more complicated.

Electronic components stores sell LED strips of various lengths and power, but we only need 12V. It is the best option for connecting to a computer via USB. For example, you can find the GE60RGB2811C model, which is 300 series connected RGB LEDs. One of the advantages of any such tape is that it can be cut as you wish - to any length. All that is needed after this is to connect the contacts so that the electrical circuit is not open and the circuit is complete (this must be done).

Color music setup scheme

Also we may need a development board for USB connections. The most popular, cheapest, yet functional connection option is the AVR-USB-MEGA16 model for USB 1.1. This version of USB is considered somewhat outdated because transmits a signal to the LEDs at a speed of 8 milliseconds, which is too slow for modern technology, but since the human eye perceives this speed as the “blink of an eye,” it is quite suitable for us.

If we omit most of the most complex technical subtleties and nuances, then all that such a connection diagram requires of us is to take a tape of the required length, release and strip the contacts on one side, connect and solder them to the output on the breadboard (the board itself shows the symbols which connector is needed and what is it for) and, in fact, that’s all. There may not be enough power for the full length of the 12V tape, so you can power them from an old computer power supply (this will require a parallel connection), or simply cut the tape. With this option, the sound will come from the computer speakers. For those who are particularly experienced in electronics, we can recommend connecting a microphone amplifier and a small “tweeter” speaker directly to the AVR-USB-MEGA16.

Scheme for attaching the contacts of the tape to the USB cord from the smartphone

If you couldn’t get this board, then as a last resort, the connection can be made via LED RGB tape 12V to USB cable from smartphone or tablet computer(the diagram for setting up color music with your own hands allows this). It is only important to make sure that the cord will provide the required 5 watts of power. At the end of all these manipulations, install the SLP program (or write down all the steps in a txt file, if your knowledge of programming allows and the diagram and algorithm of all actions is clear), select the desired mode (by the number of diodes), and enjoy the work done with your own hands.

Conclusion

Color music is not a necessity, but it makes our lives much more interesting, and not only because we can now look at flashing multi-colored lights that light up and go out to the beat of our favorite melody. No, we're talking about something else. Having made something like this with your own hands, rather than buying it in a store, everyone will feel a surge of strength from the satisfaction inherent in every master and creator, and the realization that he, too, is worth something. But in essence, the color music is installed, blinks and pleases the eye with minimal costs and maximum pleasure - what else is needed?..

Lighting in the kitchen of a small apartment
We select lamps for mirrors, possible options
Chandelier for a children's room in the shape of an airplane

Almost every novice radio amateur, and not only others, had a desire assemble a color music console or running fire to add variety to your music listening in the evening or at holidays. In this article we'll talk about a simple color music console assembled on LEDs, which even a novice radio amateur can assemble.

1. The operating principle of color music consoles.

Operation of color music consoles ( CMP, CMU or SDU) is based on frequency division of the spectrum of an audio signal with its subsequent transmission through separate channels low, average And high frequencies, where each channel controls its own light source, the brightness of which is determined by the vibrations of the sound signal. The end result of the console's operation is to obtain a color scheme that matches the piece of music being played.

To obtain a full gamut of colors and the maximum number of color shades, color music consoles use at least three colors:

The frequency spectrum of the audio signal is divided using LC- And RC filters, where each filter is tuned to its own relatively narrow frequency band and passes through only vibrations of this part of the audio range:

1 . Low pass filter(low-pass filter) transmits vibrations with a frequency of up to 300 Hz and the color of its light source is chosen red;
2 . Mid Pass Filter(PSC) transmits 250 – 2500 Hz and the color of its light source is chosen green or yellow;
3 . High pass filter(HPF) transmits from 2500 Hz and above, and the color of its light source is chosen blue.

There are no fundamental rules for choosing the bandwidth or color of the lamps, so each radio amateur can use colors based on the characteristics of his perception of color, and also change the number of channels and frequency bandwidth at his own discretion.

2. Schematic diagram of a color music console.

The figure below shows a diagram of a simple four-channel color and music set-top box assembled using LEDs. The set-top box consists of an input signal amplifier, four channels and a power supply that supplies the set-top box with AC power.

The audio frequency signal is supplied to the contacts PC, OK And General connector X1, and through resistors R1 And R2 falls on variable resistor R3, which is a regulator of the input signal level. From the middle terminal of the variable resistor R3 sound signal through a capacitor C1 and resistor R4 goes to the input of a pre-amplifier assembled on transistors VT1 And VT2. The use of an amplifier made it possible to use the set-top box with almost any audio source.

From the output of the amplifier, the audio signal is supplied to the upper terminals of trimming resistors R7,R10, R14, R18, which are the load of the amplifier and perform the function of adjusting (tuning) the input signal separately for each channel, and also set the desired brightness of the channel LEDs. From the middle terminals of the trimming resistors, the audio signal is supplied to the inputs of four channels, each of which operates in its own audio range. Schematically, all channels are designed identically and differ only in RC filters.

Per channel higher R7.
The channel bandpass filter is formed by a capacitor C2 and passes only the high-frequency spectrum of the audio signal. Low and medium frequencies do not pass through the filter, since the capacitor resistance for these frequencies is high.

Passing the capacitor, the high-frequency signal is detected by a diode VD1 and is fed to the base of the transistor VT3. The negative voltage appearing at the base of the transistor opens it, and a group of blue LEDs HL1 — HL6 included in its collector circuit are ignited. And the greater the amplitude of the input signal, the stronger the transistor opens, the brighter the LEDs burn. To limit the maximum current through the LEDs, resistors are connected in series with them R8 And R9. If these resistors are missing, the LEDs may fail.

Per channel average frequency signal is supplied from the middle terminal of the resistor R10.
The channel bandpass filter is formed by a circuit С3R11С4, which for low and higher frequencies has significant resistance, therefore, to the base of the transistor VT4 Only mid-frequency oscillations are received. LEDs are included in the collector circuit of the transistor HL7 – HL12 Green colour.

Per channel low frequency signal is supplied from the middle terminal of the resistor R18.
The channel filter is formed by a circuit С6R19С7, which attenuates signals of medium and high frequencies and therefore to the base of the transistor VT6 Only low frequency vibrations are received. The channel load is LEDs HL19 – HL24 Red.

For a variety of colors, a channel has been added to the color music console yellow colors. The channel filter is formed by a circuit R15C5 and operates in a frequency range closer to low frequencies. The input signal to the filter comes from a resistor R14.

The color music console is powered by constant voltage 9V. The power supply unit of the set-top box consists of a transformer T1, diode bridge made on diodes VD5 – VD8, microcircuit voltage stabilizer DA1 type KREN5, resistor R22 and two oxide capacitors C8 And C9.

The alternating voltage rectified by the diode bridge is smoothed by an oxide capacitor C8 and goes to the voltage stabilizer KREN5. From the output 3 microcircuit, a stabilized voltage of 9V is supplied to the set-top box circuit.

To obtain an output voltage of 9V between the negative bus of the power supply and the output 2 chip included resistor R22. By changing the resistance value of this resistor, the desired output voltage is achieved at the pin 3 microcircuits.

3. Details.

The set-top box can use any fixed resistors with a power of 0.25 - 0.125 W. The figure below shows resistor values that use colored stripes to indicate the resistance value:

Variable resistor R3 and tuning resistors R7, R10, R14, R18 of any type, as long as they fit the size of the printed circuit board. In the author's version of the design, a domestic variable resistor of the SP3-4VM type and imported trimming resistors were used.

Permanent capacitors can be of any type, and are designed for an operating voltage of at least 16 V. If difficulties arise in purchasing a C7 capacitor with a capacity of 0.3 μF, it can be composed of two connected in parallel with a capacity of 0.22 μF and 0.1 μF.

Oxide capacitors C1 and C6 must have an operating voltage of at least 10 V, capacitor C9 not below 16 V, and capacitor C8 not below 25 V.

Oxide capacitors C1, C6, C8 and C9 have polarity, therefore, when mounting on a breadboard or printed circuit board, this must be taken into account: for Soviet-made capacitors, the positive terminal is indicated on the case; for modern domestic and imported capacitors, the negative terminal is indicated.

Diodes VD1 – VD4 any from the D9 series. A colored stripe is applied to the diode body on the anode side, identifying the letter of the diode.

As a rectifier assembled on diodes VD5 - VD8, a ready-made miniature diode bridge is used, designed for a voltage of 50V and a current of at least 200 mA.

If you use rectifier diodes instead of a ready-made bridge, you will have to slightly adjust the printed circuit board, or even move the diode bridge outside the main board of the set-top box and assemble it on a separate small board.

To assemble the bridge yourself, the diodes are taken with the same parameters as the factory bridge. Any rectifier diodes from the KD105, KD106, KD208, KD209, KD221, D229, KD204, KD205, 1N4001 - 1N4007 series are also suitable. If you use diodes from the KD209 or 1N4001 - 1N4007 series, then the bridge can be assembled directly from the printed circuit board directly on the contact pads of the board.

LEDs are standard with yellow, red, blue and green colors. Each channel uses 6 pieces:

Transistors VT1 and VT2 from the KT361 series with any letter index.

Transistors VT3, VT4, VT5, VT6 from the KT502 series with any letter index.

Voltage stabilizer type KREN5A with any letter index (imported analogue 7805). If you use nine-volt KREN8A or KREN8G (imported analogue 7809), then resistor R22 is not installed. Instead of a resistor, a jumper is installed on the board, which will connect the middle pin of the microcircuit to the negative bus, or this resistor is not provided at all during the manufacture of the board.

To connect the set-top box to the sound source, a three-pin jack connector is used. The cable is taken from a computer mouse.

Power transformer - ready-made or home-made with a power of at least 5 W with a voltage on the secondary winding of 12 - 15 V at a load current of 200 mA.

In addition to the article, watch the first part of the video, which shows the initial stage of assembling a color music console

This ends the first part.
If you are tempted make color music using LEDs, then select the parts and be sure to check the serviceability of diodes and transistors, for example. And we will carry out the final assembly and configuration of the color and music console.
Good luck!

Literature:
1. I. Andrianov “Attacks for radio receivers.”
2. Radio 1990 No. 8, B. Sergeev “Simple color and music consoles.”
3. Operating manual for the “Start” radio designer.

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