[sdiy] Old unique VCO - Tune drifting problem - adapting a servo conversion‏

[Idris El Kasri]

  hi everybody!
I've tried the thermoregulating circuit from the Minisonic ! thanx Alan ;)
   It reduces pretty well the drifting pbm, with a good bias setting at the best I can get maybe  one 1/4tone up or down within 1h30~2h

  So not bad result but not the solid as a rock stability, is it the servo convertion with a matched pair that could bring that?
I don't know how to adapt that kind of conversion on the circuit, here's the schematic :
http://img826.imageshack.us/img826/646/vco2shematic.jpg

I've tried that without any result... :(
http://img337.imageshack.us/img337/1861/servow.jpg

  I beg for your help S-Diy-list...  :)




> Date: Fri, 11 May 2012 17:56:10 +0100
> From: Alan.Needham at centrica.com
> To: Gergo_Palatinszky at epam.com; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy]	Old unique VCO - T?==?windows-1256?Q?une drifting problem - adapting a servo c?==?windows-1256?Q?onversion‏
> 
> The PE Minisonic had an oven as an option.
> http://www.timstinchcombe.co.uk/synth/pe_mini/pe_mini_feb_75.pdf
>  Circuit on magazine page 145 (pdf page 6 of 7)
> I remember it taking about a minute to settle.
> 
> 
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Gergo Palatinszky
> Sent: 11 May 2012 15:49
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Old unique VCO - T?==?windows-1256?Q?une drifting problem - adapting a servo c?==?windows-1256?Q?onversion‏
> 
> Hi,
> 
> What about using a 3046(3086) and use one of the spare transistor inside as heater ... ASM-2 did this way if I'm right ....
> 
> Br,
>          Pala
> 
> 
> 
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