PURPLEOLOGY: 7-bit R-2R resistor ladder DAC

R-2R resistor ladder DAC

THIS MODULE IS A ONE-OFF - it features a 1.8mm thick 3D-printed panel faced with rust-effect decoupage paper. The end result has a glossy finish - whilst the finish is pretty sturdy it isn't indestructable, so try and avoid excessive handling.

Something for the square-wave nuts, although there's nothing to stop other people using it too.

Most DACs-on-a-chip are like this, except on a much smaller scale, with more stages and insane tolerances, this module is more fun if you consider it as a 'weighted' mixer - it's a series of 2:1 voltage dividers which you can use to combine pretty much any which way you like. Use it with 'traditional' waveforms (sine, triangle etc.) to get deep, beating drones or combine audio-rate square waves to get a warbly, 8-bit vibe going.

Finally, if you use with a clock divider you can get a pretty decent sawtooth out of it by feeding the divider outputs into the DAC inputs.

Endless opportunities ...

Built with 1% resistors for the resistor ladder, this module is also finished with funky anodised jack nuts which are colour-coded thusly:

Purple - inputs (DC coupled)
Blue - output
Supplied with a power cable and mounting hardware, this module is 3HP wide and approximately 50mm deep with the power cable attached. PLEASE MAKE SURE YOUR CASE IS DEEP ENOUGH TO ACCOMODATE IT.