AS3340 CV input negative voltage

[Caustic]

I wrote a post about summing OpAmp circuits here (showing how the simple mixer worked):

LMNC Super Simple Mixer [Strip Board Layout + BOM]

Notes on Schematic: The TL072 is a chip which has two operational amplifiers, and this mixer takes advantage of a specific type of Op-Amp circuit called a “Summing Amplifier Circuit”. Tldr; Summing Op-Amp circuits basically mush all the inputs into a single output voltage that is literally the sum of all the other voltages. [tl072] As stated in the instructions, all of your inputs go into pin 2, which is the inverting input of the Op-Amp (the part of the triangle with the - sign). [image] …