SV: [sdiy] QVCO schemo up

[Harry Bissell Jr]

no ME...

don't even DREAM about building one before me !!!

OK... F-it.

(go ahead) BUILD one.

I SPICE simulated it, already. It works well
as advertized.  DO NOT try it with a 3080
it will generate quasi-triangle waves. You need
the LM13700 (or 13600 I presume) with the diode
linearization.

I did get offset on the two waves in opposite
directions. I have not 'trimmed' the simulation.

It takes hundreds of cycles to come up to stable
amplitude. I suspect this will be similar to an old
Wien-bridge oscillator which takes a long time to
stabilize after a frequency shift, but I didn't
simulate that, yet.

This might be the simplest sine-wave oscillator that
I've seen.

Ian... you should send these to EDN magazine and pimp
them for the $150.  You'd be sure to get the money
(in about six months :^)  You'd even have your name in
glorious black and white... otoh you could use the
even
more exclusive "Electronotes" to get your
electro-notariaty   :^P

H^) harry

--- karl dalen <dalenkarl at yahoo.se> wrote:

> This is so interesting i have to build one right
> away! :)
> 
> KD
>