[sdiy] Old unique VCO - T?==?windows-1256?Q?une drifting problem - adapting a servo c?==?windows-1256?Q?onversion‏

[Harry Bissell]

Hmmm...  the voltage is probably not much of an issue imho.  There were many of these designs... some can
be found in applications notes from National Semiconductor and Linear Technology (look for Jim Williams as
author). I'm suspicious of this particular design as it uses the differential pair as the heater and sensor... and these the are the transistors with the best matching (they would all be good, but this pair is specified to match).
Other designs used different transistors and reserved the differential pair for the VCOs. There are better and worse
transistors to use for the heater and sensor, maybe someone on list knows more than me. Be sure to connect the substrate pin to a more negative voltage than any other point in the circuit, but watch out for the maximum voltage
rating on the chip (+/-15V is TOO much and you need to limit the applied voltage to less).

ASA

H^) harry

----- Original Message -----
From: Idris El Kasri <idris1er at hotmail.com>
To: alan needham <alan.needham at centrica.com>, gergo palatinszky <gergo_palatinszky at epam.com>, synth-diy at dropmix.xs4all.nl
Sent: Fri, 11 May 2012 13:07:27 -0400 (EDT)
Subject: Re: [sdiy] Old unique VCO - T?==?windows-1256?Q?une drifting problem - adapting a servo c?==?windows-1256?Q?onversion‏


  Very interesting, as Gergo's suggestion..
Do you think I could try that with 10V without any modification (as it is 9V for the Minisonic) ?

----------------------------------------
> 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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-- 
Harry Bissell & Nora Abdullah 4eva