3 Channel Color Organ Circuit

  
The ac line power is brought back into the circuit through Fl, a protective 5-A fuse. One side of the ac line is connected to one side of each ac outlet. The other side of the ac line is connected to each SGR or silicon-controlled rectifier. Each SCR is, in turn, connected to the other side of each ac outlet.An audio signal is brought into the circuit from a stereo speaker by transformer Tl. This transformer has 500- Impedance on the primary and 8- impedance on its secondary. Connect Tl so that the 8- side is connected to the speaker and the 500- side is connected to potentiometer PI.Potentiometer PI is used as a level or sensitivity control.
3 Channel Color Organ Circuit - schematic

The signal from its wiper lead is applied to each RC filter stage. Because each SCR has a different RC (resistor/capacitor) filter on its gate lead, each will respond to different frequencies. The greater the capacitance in the filter, the lower the frequency that the SCR will respond to.




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