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Tempcos in the missed

The yusynth VCO was missing a tempco. So I ordered some from Vintage Planet and as soon as I got them (ultra fast) I put them on both the VCOs I’ve made and TADAAAAA! ONE OF THEM WORKED almost as expected (the other one is still too unstable). So I will hunt down and kill [...]

Not quite functional!

Made two yusynth VCOs the other day.. None works… But the real problem is that at the schematics it mentions using a 1% silver mica capacitor. I have used plain ceramic and multilayer. Voltages are OK. The comparator and OP Amps get nice voltages. No electrolytic capacitors are the other way around. So it [...]