[sdiy] Barron ringmod

[David G Dixon]

Yes, that's what I call a Zener bridge.  I use them in my tricore VCO
designs (e.g. Dixie, Rubicon). 

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] 
> On Behalf Of Neil Johnson
> Sent: Saturday, May 21, 2016 3:45 PM
> To: bbob
> Cc: synth DIY
> Subject: Re: [sdiy] Barron ringmod
> 
> On 21 May 2016 at 18:59, bbob <fluxmonk at gmail.com> wrote:
> > On a page about Bebe & Louis Barron, Barry Schrader includes what 
> > looks like a notebook page w/ an odd ring-mod schematic:
> >
> > http://www.barryschrader.com/blog/bebe_barron_1925_2008
> > 
> http://barryschrader.com.hostbaby.com/img/Bebe_Barron/Barron_Circuit.j
> > pg
> >
> > Any ideas what's going on w/ the zeners in the middle of 
> the ring? and 
> > the following opamp?
> 
> It's a bipolar limiter - the diodes steer the current so that 
> no matter the input polarity the zener diodes are always 
> reverse-biased.
> I'm guessing that the top zener limits the maximum 
> differential voltage to 12V, and the two zeners to ground 
> limit the maximum common-mode deviation from 0V to +/- 12V.
> 
> Not a ring modulator.
> 
> Neil
> --
> http://www.njohnson.co.uk
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