The “Little Green NAND” synth

Published on Jun 18, 2018 Mike Sisk

"This is a small noise making synth I built from a Synthrotek 'NAND Synth' PCB and the head from a Toy Story 'Little Green Men' alien toy. Main pitch is controlled by the alien’s antenna. Knobs in each ear control the two oscillators with switches to shut each on or off independently. LED installed in each eye, red in the center for power and green on the sides to show the rate of each oscillator. Power switch and volume control on back with audio output on the nose. “Dive bomb” button and switch that select between two large capacitors which give a winding down sound as unit slowly loses power. Oscillator 2 switch selects a light depended resistor attached to the back of the oscillator 1 LED which in turn causes both to be controlled from oscillator 1 knob. Power starve knob that limits the power from the battery and causes a similar effect to the dive bomb but more drawn out. And lastly on the back of the head there is a CV input and switch that select between battery power or external CV. All of this is base around the 4093 IC on a PCB from synthrotek."