[sdiy] EMS VCS3 VCO

[harrybissell]

Hi Yves...

some spice advice. I have not tried this oscillator but...

Spice has perfect components... try modeling some realistic offset etc.

If you can program in some 'event' at a non-zero time... use a switch
closure
or voltage transient to 'kick start' the oscillator.  Progs like Electronic
Workbench
will allow interactive use... so you can kick start it by hand.  Even in a
normal
spice transient analysis you should be able to do something like this.

You may not be waiting LONG enough for oscillation to start...

I'll try it, maybe later

H^) harry

Yves Usson wrote:

> Hi and happy new year !
>
> I intend to build myself a clone of the EMS-VCS3 and before going into
> the hardware, I tried to simulate the behaviour of the VCO1
> with Spice3. The simulation is based on the schematics available at
> Graham Hinton's site. Unfortunately, the bloody thing doesn't oscillate
> at all !
>
> Has somebody in the list ran such Spice simulation for the same circuit
> and did it work ? Has somebody built the oscillator from this schematic
> and what are the pitfalls?
>
> Thanks for you advices.
>
> Yves
> -----------------------------
> Yves Usson
> http://www-timc.imag.fr/Yves.Usson/personnel/SDIY
>
> -------------------------------------------------
> envoyé via Webmail/IMAG !