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`tune` the hard way via Logic Noise (Supercon '18)

After attending the Logic Noise: Breadboard Your Own Primitive Synthesizer workshop, I thought why not have the badge control the synth?

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Getting 40xx CMOS basic logic chips to make music was relatively easy (thanks Elliot Williams) but when I wanted to interface the multiplexer to the badge's GPIO I realized I had to interface 9v CMOS with 3.3v TTL.... enter some hacky MOSFET level shifters. More details (and video) to come.
  • 1 × 4069UB Hex Inverter Logic ICs / Gates and Inverters
  • 1 × 40106 Hex Schmitt inverter Logic IC
  • 1 × 4040 Binary Counter Logic IC
  • 1 × 4051 8-way multiplexer Logic IC
  • 3 × 2N3904 Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs

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Elliot Williams wrote 11/09/2018 at 22:47 • point

Awesome!  Can't wait to see what comes of this.

For quick-and-dirty 9V logic to GPIO input, you could use diodes pointing "against" the 9V source (and maybe a pull-up resistor on the GPIO side): the logic chips will be able to pull the voltage down, but will be blocked from sending their full 9V through.

Going GPIO -> 9V Logic though, you'll want a transistor or FET, like you're suggesting.

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