A simple color-music prefix. 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 music box can be mounted on the front panel of a stereo tape recorder, electrophone, or radio receiver.
The prefix is made on two transistors, one logic chip and four miniature incandescent lamps. The signals coming through resistors R1, R7 and capacitors C1, C2 to the input of the device are amplified by transistors V1 and V2 and fed to the inputs of inverters D1.1 and D1.3, the output circuit of which includes incandescent lamps H1 and H3. The outputs of these inverters through resistors R4, R10 are connected to the outputs of the inverters D1.2 and D1.4, loaded with incandescent lamps H2 and H4. When the lamp H1 is lit, the lamp H2 goes out, when the H3 is ignited, the H4 goes out and vice versa. Thus, when a signal is received at the input, the lamps H1, H2, H3, H4, as it were, wink at the frequency of the sound signal. The lamps are installed behind a light-diffusing screen measuring 650 x 50 mm, painted red, blue, yellow and green, respectively.
Details: incandescent lamps SMN-6,3-20; fixed resistors MLT-0,25, tuning resistors - SPO-0,5 or SP-0,4; capacitors C1 and C2 - KM or MBM. The setting comes down to adjusting the resistors R2 and R8 so that, without a signal, the lamps H1 and H3 are at the ignition threshold. Resistors R4 and R10 achieve the extinction of the lamps H2 and H4 with the full glow of H1 and H3.
Author: A.Polozov
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