This is a fun circuit that can be used at parties for example. The 4 LEDs flash on the beat of the music. The light organ responds to sound using a microphone.
T1 amplifies the signal from MIC. The sensitivity can be controlled with P1. T4 controls the LED's. These are preferably LED's with a high light intensity.
MIC is a condenser microphone. The circuit can be powered with a 9 V block battery.
MIC is missing in this simulation!!. it should be connected to the 100nf to gnd.
