Part 4 in the series on building a Lunetta synth with a Quad NAND CMOS chip. Now, we add a closed feedback loop through all NAND Logic nodes on the chip back to the first one. The result is an unpredictable, wild, and almost insane gate modulation.
Part 2. In this post we explore using the Quad NAND CMOS chip as an oscillator. This is actually a pretty simple circuit. We use the aforementioned CD4093 chip. All we need to add is a capacitor and a matching resistor to generate a square wave Lunetta style.
Part 1. Lunetta synths create sound by using digital logic chips. They’re very easy to build and so much fun. With just a few parts you can make a square wave oscillator, sequencer or noise machine. In this article, we take a look at the Quad NAND CMOS chip as a Lunetta.