Colour (Sound) Organ

Anyone who has been to a night club, concert or school dance has probobly seen a colour organ. Colour organs cause lights to blink and flash to music from your TV, stereo, guitar and even your own voice. The colour organ presented here needs no connection to the sound source, it picks up sound from its built in microphone.

Schematic

PC Board Layout

Parts Placement

Parts

Part Total Qty. Description Substitutions C1 1 22uf 250V Electrolytic Capacitor C2 1 22uf 250V Electrolytic Capacitor C3 1 0.1uf Disc Capacitor C4 1 0.01uf Disc Capacitor C5 1 0.0047uf Disc Capacitor R1 1 47K 1/2 W Resistor R2, R4 2 6.8K 1/2 W Resistor R3, R5 2 1M 1/2 W Resistor R6 1 3.3K 1/2 W Resistor R7, R8, R9 3 1K 1/2 W Resistor R10, R11, R12 3 10K Pot D1 1 1N4004 Diode Q1, Q2 2 2N3904 NPN Transistor 2N2222 Q3, Q4, Q5 3 106B1 SCR Teccor S2003LS1 T1 1 10K:600 Ohm Audio Transformer S1 1 SPDT Switch J1, J2, J3 3 AC Socket MISC 1 AC Line Cord, Crystal Microphone, Case, Wire

Notes

1. R10, R11 and R12 control the response of the different lights.
2. The circuit can handle up to 300 watts per channel.
3. This circuit is NOT isolated from the 115 Volt line. If it is used with the case opened or not installed in a case, you could recieve a bad shock or be killed.
4. You can also use the Teccor S2003LS1 SCR for SCR1. These give better sensitivity and brightness than the 106B1 units.
5. Thanks to James Maloway for redrawing the schematic.