[sdiy] the most simple semicon VCO ever built

[Czech Martin]

Yesterday I browsed through a 1970 something issue of the
"Funkschau" mag. I saw a simple VCO, one cap , one
npn one resistor. Obviously the transistor was working
in tunnel diode breakdown, thus creating negative
impedance characteristic.

The base was left open, but it was said that it could be used
for frequency control.

If there is some interest, I could scan this little
picture. Perhaps one more item to the "most simple modules
collection" a la Korg.

I felt asleep, so the whole thing fell down, I hope
I can dig it out again...


Martin Czech

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