[sdiy] discrete/no-OTA VCO

[DAF]

thanks for all of the suggestions thus far - I am particularly intrigued by 
the UJT voltage-controlled relaxation osc.
especially because of the low parts count, but I am wondering if
the UJT is also going the way of the dodo bird, and also is the control of 
frequency linear over a wide enough range (I see it used in
synths that use octave divider schemes)?

In that Ray Wilson schematic, he says for a VCLFO, leave out the parts in 
RED; are you to join the resulting gaps together on the wires shown 
remaining?

Dave




----- Original Message ----- 
From: "Simon Brouwer" <simon.oo.o at xs4all.nl>
To: "sdiy" <synth-diy at dropmix.xs4all.nl>
Sent: Monday, December 29, 2008 3:13 AM
Subject: Re: [sdiy] discrete/no-OTA VCO


> Here is one:
>
> http://www.elby-designs.com/asm-2/lfo/lfo1-asm2-cct.pdf
>
>
> DAF schreef:
>> Hello - can someone point me to a circuit for a  voltage-controlled
>> lfo that uses discrete or other easy to source parts.  I have used an
>> OTA-based design in the past, but I want to design around more generic
>> parts.  I seem to remember a vco that used a discrete JFET?  I don't
>> neet expo response or temp compensation.  I am looking for about a 2
>> to 10 Hz response range.  I don't want to use any specialty chips or
>> OTA's, just discrete transistors and op-amps.   Any help greatly
>> appreciated.
>>
>> thanks,
>> Dave
>
>
> -- 
> Vriendelijke groet,
> Simon Brouwer.
>
> | http://nl.openoffice.org | http://www.opentaal.org |
>
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