A simple three-channel color and music console. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands
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A simple color and music prefix is designed to work with a tube radio or tape recorder. Connect it to the secondary winding of the output transformer. For power, the alternating voltage of the filament winding of the lamps (4 V) rectified by the V6,3 diode is used.
The prefix is three-channel. The channel on the transistor V1 amplifies the components of higher frequencies, on the transistor V2 - medium, on the transistor V3 - lower. Separation of the frequency spectrum of the input signal is carried out by the simplest filters R3C1, R5C2C4 and R7C3C5. The loads of the transistors are miniature incandescent lamps MH6,3-0,28, painted in blue, green and red.
Variable resistors R5 and R7 balance the brightness of the glow, taking into account the spectrum of the real musical signal, the variable resistor R1 regulates the minimum brightness of the glow of all lamps at the selected sound reproduction volume.
The adjustment begins with the selection of resistors R2 *, R4 * and R6 * (at this time it is advisable to replace them with variable resistors with a resistance of 6,8 ... glowed visibly. Having achieved this, the engines of the resistors R10, R1 are set to the middle position and a signal is input from the secondary winding of the output transformer. Having set the normal volume of the sound and the maximum rise in high frequencies with the regulators of the receiver or tape recorder, move the slider of the resistor R6 until the lamps H5, H7 begin to flash in time with the music. Last of all, variable resistors R1 and R1 achieve the same bright glow of lamps H2, H5 and H7, H3.
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