[sdiy] Monotron Schematic - Guard Rings

[Harry Bissell]

The UJT is its own discharge switch for the relaxation oscillator. The othertransistors are a current source to charge the timing capacitor.

The UJT was popular for sawtooth oscillators at one time, but they were fickle and
expensive to get really good parts.

H^) harry




----- Original Message -----
From: Ingo Debus <igg.debus at t-online.de>
To: synth diy <synth-diy at dropmix.xs4all.nl>
Sent: Fri, 05 Nov 2010 16:58:49 -0400 (EDT)
Subject: Re: [sdiy] Monotron Schematic - Guard Rings


Am 05.11.2010 um 18:54 schrieb Harry Bissell:

> They look like a sawtooth VCO whose frequency is set by whatever  
> the last sample
> voltage was... kind of a way of "shaking the dice" at different  
> rates each time...
>
> Clever, wonder if it works well... sure is simple (no noise  
> generator needed)
>

Is this an answer to my question re how the random voltage generator  
in the Steiner Synthasystem works?

So the UJT is the discharge switch of a relaxation oscillator?

Making an analog random generator this way is pretty brilliant. Hats  
off!
And then there's two of them in one module that can be run with the  
same trigger signal (if no plug is inserted in the trig 2 input). I  
wonder how similar the outputs are?

Ingo
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-- 
Harry Bissell & Nora Abdullah 4eva