simple oscillator - old chestnut new branch - Electronic Circuits Projects Diagrams Free

chukabuka · 17th September 2008, 01:10 AM

Hi every one, I am be new here, this be my first post.

Ref old thread by pixelsnpings, this Forum, I offer this:

There is an oscillator which uses just three discrete components; a transistor, one capacitor and one resistor.

Here it is.

Cheers all.

Roff · 17th September 2008, 01:17 AM

Funy (sic) you should mention this. See the link in this thread.
I built a negative resistance oscillator like that around 1968.

chukabuka · 17th September 2008, 03:58 PM

yes, negative resistance is at the heart of the circuit. I first come across the same in 1968, in an article in a magazine called 'Wireless World'. As is stands it is useful as a rough sawtooth osc, and it only takes about 2 minutes to construct.

The base, although unused here, can be used as a sync input, if the oscillator is used as one of a group in a toy organ. Each base, if driven from a lower, modulating frequency, causes all oscillators to synchronize with the mod frequency, or so it was said at the time of publication.

The transistor should be a silicon planar type, as ony these types will work, I think.

Thanks for the fast response by the way.

Cheers.

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17th September 2008, 01:17 AM	(permalink)
Roff	Funy (sic) you should mention this. See the link in this thread. I built a negative resistance oscillator like that around 1968. __________________ Ron Last edited by Roff; 17th September 2008 at 01:19 AM.

17th September 2008, 03:58 PM	(permalink)
chukabuka	re the neg resistance transistor yes, negative resistance is at the heart of the circuit. I first come across the same in 1968, in an article in a magazine called 'Wireless World'. As is stands it is useful as a rough sawtooth osc, and it only takes about 2 minutes to construct. The base, although unused here, can be used as a sync input, if the oscillator is used as one of a group in a toy organ. Each base, if driven from a lower, modulating frequency, causes all oscillators to synchronize with the mod frequency, or so it was said at the time of publication. The transistor should be a silicon planar type, as ony these types will work, I think. Thanks for the fast response by the way. Cheers.