[sdiy] TZ triangle core

[Harry Bissell]

I'm still playing with the simulation. It works correctly (sort of) but for some reason my polarity switchers
tend to bounce right out of the real world. The last crash was sitting at about 80MV on a transition.

no that not a typo. 80 MEGA volts... (from a 741)

I told you those were some really rugged opamps :^)

H^) harry



----- Original Message -----
From: Ian Fritz <ijfritz at comcast.net>
To: synth-diy at dropmix.xs4all.nl
Sent: Sat, 05 Mar 2011 22:22:59 -0500 (EST)
Subject: Re: [sdiy] TZ triangle core

OK, I had the topology out of order.  This one is what works:

Lin CV --> polarity switch 1 --> integrator --> polarity switch 2 
-->  Schmidt triggger
Schmidt trigger  --> polarity switch 1 control
Lin CV --> comparator --> polarity switch 2 control

Still just 6 opamps and an OTA.  Has anyone seen one simpler?

Still a minor issue with startup for one modulation polarity, but turning 
the know over to the other side gets it going.  It may need a little 
kickstart something or other.

   Ian

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-- 
Harry Bissell & Nora Abdullah 4eva