3 Tone Audio Oscillator Circuit CD4001

3 Tone Audio Oscillator is a simple circuit which will generate audio tone on the press of a button. This circuit can be very useful as a test equipment for audio equipment’s or as a signal source for  an audio input.

Input – 12 VDC @ 100 mA
Output – Speaker, 8 Ω / 0.25 W
Three switches produce 1.2 KHz, 725 Hz and 325 Hz
Terminal pins for supply Voltage and speaker connection
Power-On LED indicator
Four mounting holes of 3.2 mm each
PCB dimensions 42 mm x 48 mm