4 oscillator Nand Tone Generator
4 gated Oscillator Nand Synth Drone :
4 tunable square wave oscillators with high and low pitch
four 555 in astable configuration gating and four oscillators made with just one 4093.
three way switch turns oscillator on/off or through to gate
two way switch High/ Low pitch
two way switch High/ Low pitch
or Quick/ Slow Pulse
