90-degree phase tri lfo revisited

[Haible Juergen]

Just taken a brief glance. The LM311 with the 68R resistor
struck my eyes. Never seen this before. I guess that's a clever
way to introduce som hysteresis without using up the + input (?).
Great !

JH.

> -----Original Message-----
> From:	jorgen.bergfors at idg.se [SMTP:jorgen.bergfors at idg.se]
> Sent:	Monday, August 09, 1999 7:39 AM
> To:	pfperry at melbpc.org.au; synth-diy at mailhost.bpa.nl
> Subject:	Re: 90-degree phase tri lfo revisited
> 
> >> You can get arbitrary phase shifts by
> >>starting with a saw oscillator, going through an ElectroNotes sawtooth
> >>phase shifter, and then a saw to tri converter.
> >...I dont know this ckt, I presume there is a comparator which says
> >when to add or subtract the comparator input from the original
> >sawtooth.. cant quite see how yet..
> 
> You can find the schematics for just such a circuit om my web site
> http://www.idg.se/personal/bergfors/bergfotron/quadrature%20saw%20shaper.g
> if
> I have built it, and it actually works.
> 
> /Jorgen