This little guy was my first excursion into audio circuits. It’s a Stepped Tone Generator that puts out some great lo-fi-Atari-esque square waves with a little bit of practice.

Features:

• 2 knobs for controlling the pulse frequency and width
• volume knob
• on/off toggle
• tact switch to pulse the sounds on and off quickly
• 1/4” audio jack for stero or headphone use
• 9-volt powered
• spiffy blue LED

Todo:

• have the tact switch do double duty as a kill switch when the toggle switch is in the on position
• built in speaker
• dc power input
• blinking LED representation of wave pattern