Introduction to Dave from SpectrumDIY

[analogoutput]

Have fun waiting for the PSU! If there are further troubles after that, best to post about them in an existing topic like this one

CEM 3340 simple VCO

On the Strip board layout it calls for a .1nf Cap , but on the BOM it states 1nf , which one is it ? Cheers Daryll

for easier finding by future readers who may learn from your experience. Also check

General advice for troubleshooting a module and asking for help

(This is a wiki post, please add and correct!) Look and see if others have had the same problem. Use the Discourse search facility to find topics where the module you’re building is discussed. Inspect your work. Verify all components are correct values. Look for solder connections that are rough, irregular, skimpy, dull, or missed completely (we all do that!) and reflow them. Look for solder bridges between pads and remove them. Check your power connection. If it’s a Eurorack style power cabl…

and

Advice for troubleshooting 3340 based VCO

This is a wiki post; please correct and improve! This is written regarding the 1222 Performance Oscillator module, but similar things apply to the simple stripboard oscillator or other oscillators based on the 3340 chip. For the stripboard version also see If you are not getting good tones from the oscillator, do the following. If with the 1222 you are also not getting good behavior from the tuner, don’t waste time on trying to fix that yet. Get good tones on the outputs first — the tuner won…

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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.