Diagram consists of three active filters on the transistors VT1-VT3 and three gauges of stress on the microcircuits THE [A]1- BASICS (LM3915), loaded with the light-emitting diodes, established in the screen [TSMU].
to the current to 850 mA (it befits net adapter, for example, from the play prefix “by dandies”). Desirably so that the light-emitting diodes would be different colors, red, dark-blue, green. But at the disposal of the author there were only white super-bright light-emitting diodes; therefore they were painted in the necessary colors with the quick-drying clear varnish for the furniture, into which as the dyes was added many-colored (dark-blue, red and green) paste from the ball-point pens. It is possible to break light-emitting diodes into the groups and to make a screen of soundlights with three zones, isolated with the light filters of different colors or to make three different lamps (“searchlight”) with the reflectors and the many-colored light filters. Adjusting consists only in tuning of active filters. This makes with the aid of the generator OF LF. By resistors R5, R12 and R16 establish necessary width of zones of filters.
Soundlights device is calculated for the connection to the dynamic head of any radio set, whose nourishment has galvanic decoupling with the network. If we say briefly, then the task of soundlights device is reduced to the conversion of the musical sounds of the specific tones in the color of the corresponding painting. For example, to the lower tones (frequencies) corresponds red color, by average – green, highest – dark-blue. From the cursor of variable resistor signal will be given through the capacitor Of [s]1 to the base of the transistor VT1 of the amplifier stage, general for all channels. The load of the amplifier stage is resistor R4. From it the signal enters further three color channels. One of them, high-frequency, is assembled on the transistor VT2. Its base enters through the capacitor Of [s]2 signal by the frequency of above 800 Hz. it as a result ignites the lamp EL1 of dark-blue color. On the transistor VT3 is assembled the channel of medium frequencies with the lamp EL2 of green color. Because of the filter from the capacitors [SZ], [S]4, the base of transistor enters only the signal of medium frequencies, the lowest and highest frequencies are weakened. Cascade on the transistor VT4 with the lamp EL3 of red color is designed for the work from the signal of the lowest frequencies. Filter [S]5[S]6 passes well signals with frequency to 2000 Hz, the signals of higher frequencies considerably are weakened. Since the stronger signals in comparison with the channel of the highest frequencies enter the bases of the transistors of the channels of average and lowest frequencies, in these channels are introduced the fine-adjustment resistors (R8 and R10), which level strengthening channels. Feeds [tsvetomuzykalnaya] prefix from the weak block, which consists of the step-down transformer Of [t]1, rectifier on the diodes VD1-VD4 i. of filter from the capacitors Of [s]7, [S]8 and resistor Of r11. All fixed resistors of [tsvetomuzyki] can be [MLT]-0,25, besides R11 – it wire, for example type [PEV], with the power not of less than 5 W (at the worst, this resistor can be prepared from the section of spiral from the electric stove). Variable resistor R1- CP -1, fine-adjustment – cP -1A or cP -1B. Transistor VT1 – of the series [MP]39-[MP]42 with the gear ratio factor of current is not less than 40. Power transistors VT2-VT4 – series [P]213-[P]217 with the highest possible gear ratio factor, but it is compulsory identical or by close one. Each output transistor of [tsvet]i[muzyki] must be strengthened on the radiator from duralumin with a thickness 2… of 3 mm and with the sizes of 60[Kh]50 mm. of lamp – to the voltage 6,3 [v] and the current of 0.28[A] ([MN] 6,3-0,28). Capacitors Of [s]1, [SZ], [S]5 – [S]8 – [K]50-6, rest – [K]50-3[A]. Instead of the diodes Of [d]232 will approach other rectifying diodes, calculated for the current not less than 3a and inverse voltage is not below 50 v. the power transformer of [tsvetomuzyki] home-made. It is executed on the magnetic circuit [SH]20[KHZO], winding 1 contains 2200 turns of wire [PEV]-1 0,1, the winding OF THE II -120 turns [PEV]-1 0,9. Will approach the finished transformer with a power not of less than 20 W with the voltage on secondary winding by 8… 10 [v] with the current Of [a]. [Bolshinstvo]’s load 1-2 the components of [tsvetomuzykalnoy] prefix are installed on the pay from the insulation. Installation can be both the attached and printed. The mutual arrangement of the components of special importance does not have, it is important so that there would be the free access to each of them.
The adjusting of [tsvetomuzykalnoy] prefix begins from the measurement of rectified voltage – it must be on the outputs of the capacitor Of [s]7 or [S]8 of approximately 12 [v] and differ not more than to 20%. None of the lamps in this case must shine.
A voltage drop across the lamps of channels further is measured – it must be not more than 1 [V]. Rather, this stress establish by the selection of the corresponding resistor in the circuit of the base of power transistor (R5, R7 or R9). By the selection of resistor R2 (if this is required) the cursors of the tuned resistors of soundlights is established stress on the collector of the transistor VT1 relative to its emitter equal to approximately 7 v. then establish approximately to the mid-position, will be given to the entrance of prefix signal from the audio signal generator. Signal amplitude is established 0,5 [v], frequency -1000 Hz. moving the cursor of variable resistor R1, they attain the brightest glow of lamp EL1 (or the switch oned instead of it three lamps with the second version of screen). Stress on the lamp must not exceed that permitted, otherwise lamp can burn out. With the constant amplitude of the output signal of generator changes its frequency and they determine the frequency, which corresponds to the greatest brightness of lamp. With an increase brightnesses move the cursor of variable resistor downward according to diagram so that the lamp would not be overloaded. This there will be the unique resonance frequency of the channel of the highest frequencies. In order to move it to that or other side, it is necessary to change the capacitance of the capacitor Of [s]2: with the decrease of its capacity the frequency grows, and vice versa. After this, they decrease the oscillator frequency, after placing preliminarily the cursor of fine-adjustment resistor R8 in upper according to diagram position. As in the preceding case, the resonance frequency of the channel of medium frequencies finds. With the approach to it the brightness of lamp EL2 they decrease by the displacement of the cursor of resistor downward according to diagram. It is completely permissible, if resonance frequency comes out 200… by 400 Hz. to if necessary move it to the side of lower frequencies sufficient to increase capacitance of capacitor [SZ], and to the side high- to more decrease the capacity of capacitors [SZ] and [S]4. The cursor of fine-adjustment resistor leaves in such position, with which the intensity of the glow of lamp EL2 at the resonance frequency is the same as lamp EL1. Analogously they check and they if necessary adjust the channel of the lower frequencies of soundlights. Resonance frequency (about .100 Hz) changes with the selection of the capacitors Of [s]5 and [S]6. During the work of soundlights device the signal amplitude of different frequency will be unequal; therefore at the screen will begin to appear the aurora borealis of different painting and saturation (if lamps are directed toward the screen). Depending on the usable work by variable resistor it is not difficult to establish the most pleasant intensity of the glow of the screen of soundlights.