High Voltage (220VAC) Bass-Treble Automatic Disco Light Controller
The previous music-controlled disco light controllers, the audio-controlled disco light controller circuit and hi-lo (treble-bass) disco light controller have some features and drawbacks. The first one features high voltage drive, enable the circuit to drive 220VAC lamps, and the drawback is that it has only one way (single channel control). In the other side, the second version has two-way (bass and treble) control paths, but it drives only low voltage lamps. To combine all of their benefits, now a high voltage (220VAC) controller is designed to have two-way control, bass and treble paths. Here is the schematic diagram of the circuit:
The transformer is a standard transformer for power adapter, choose between 100-350mA rating. Optional to 12V small power transformer, you can also use a 21V-220V 100mA transformer which is usually designed for TV booster, use the 21V winding for the audio input. Please be warned that all parts of the circuit, except the 12V winding of the transformer (connected to the audio input) is directly connected to hazardous voltage (220VAC). Never touch all wirings and components without isolation, and adjust the potentiometer VR2 though a plastic knob. Watch the circuit in action in the following Youtube video.