2 Tone Audio Oscillator Circuit

2 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 test equipment for audio equipment or as a signal source in an audio input.

Input – 5 ~ 12 VDC @ 100 mA
Output – Speaker, 8 Ω / 0.25 W
Two switches produce / play different frequencies
Frequencies 1.2 KHz, 700 Hz
Terminal pins for supply voltage
Power-On LED indicator
Four mounting holes of 3.2 mm each
PCB dimensions 47 mm x 46 mm