I have recently build the CEM3340 based simple VCO with the full square wave modifications. After making and fixing a few mistakes, its behaving very oddly. The wave shaping for the triangle and saw waves is working, but rather than a tone its giving out a screeching sound, reminiscent of dial up. The tuning knob and CV input are not changing the pitch of this screeching, even though they are (to my knowledge) wired correctly. I am also getting no output at all from the square wave. Any help would be greatly appreciated!
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you say the wave shaping for the saw and tri are working, but give out screech… so that’s contradictory.
Without knowing the circuit or and hi-res images of the build, its going to be difficult to give any advice.
post up what you have.
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Here are images of what I’ve made so far. I’m having difficulties uploading a video of what it sounds like, but the noise coming from the triangle and saw outputs are distinctly different. It almost seems like its oscillating at a very high frequency, but I’m unable to adjust it.
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Can we see the underside, please?
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