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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.


This is the schematic of the Colour Organ

PC board layout

This is the printed circuit layout of the Colour Organ

Parts Placement

This is the parts placement of the Colour Organ


Total Qty.
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


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.

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