3340 VCO sounds like a LFO, please help me!

[fredrik]

Your coarse tuning pot may not be wired up correctly. See the drawing and the first few comments here for how and where to measure the CV inputs:

Annotated Simple 1V/Oct Oscillator Stripboard

And here’s the LMNC 3340 stripboard layout, with scribbles: [image] See here for the annotated Simple Low Pass Filter stripboard.