[sdiy] Zener clipping Was : ...that 1K resistor on the output

[Ian Fritz]

At 02:59 PM 1/29/2011, David G. Dixon wrote:
> > Oh, you mean like in the auxiliary oscillator in my three-phase LFO?
> >
> > http://www.milton.arachsys.com/nj71/pdf/cesyg/vclfo-sch.pdf
> >
> > The back-to-back zeners are D11 and D12 around comparator IC5A.  They
> > clamp the output of the comparator and set the input current into the
> > integrator IC1C / IC6A.
>
>Yep, that's it!


So I guess this is an improved version of the ENS-76 Option 2 VCO (EN#75, 
p11)?  That used an OTA hysteretic switch driving a  4-diode clipper 
(+/-1.2V) followed by an attenuator to +/-50mV to drive the OTA 
integrator.  Has anybody tried that one?

  Ian