Today I finally got 2 of the 4 Thomas Henry VCO 555 build and tuned.
These are some very nice and easy to build VCOs.
I build one with a 2k tempco and the other one with one KTY 81-121 and 1k resistor in series after a theory from Rene Schmitz. Both versions work fine.
Seemore on my Signal Generators
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