[sdiy] the most simple semicon VCO ever built

[Magnus Danielson]

From: "Czech Martin" <Martin.Czech at Micronas.com>
Subject: [sdiy] the most simple semicon VCO ever built
Date: Tue, 25 Mar 2003 13:53:26 +0100

> 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.

In the words of Roger Rabbit:

P-P-P-Please!

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

Please take on the effort. Oddities like these are also what you learn from.

Naturally it would be nice to benchmark one up and see how well it performs
and then discuss how to "enhance" the curcuit. If it operates by a different
mode of the transistor, it would be nice to see what temperature dependencies
is in there etc.

Please recall that several of us is not fluent in German, so you might have to
translate enought for us to understand - bitte!

Cheers,
Magnus