[sdiy] CA3046 Heater TempComp

[patchell]

    I sort of worded my message wrong...This is NOT my design.  This was
a Tau Systems VCO.  I redrew the circuit, that is all...Just want to
keep the record straight here...since there is a certain sensitivity in
the group on this subject.

jhaible at t-online.de wrote:

> patchell schrieb:
> > http://www.silcom.com/~patchell/TAU1010/TAU1050.PDF
> >
> >     This was a VCO sold about 20 years ago.  I redrew the
> > schematic, to make
> > it more readable...hopefully, it is accurate.
>
> Nice circuit !
> No opamp in the expo converter - And I thought you didn't like
> discreet designs. (;->)
> Looks EMS-inspired, but with an extra transistor for HFT (?).
> I would have expected a zener diode instead of R11 - that's
> how the EMS one works, at least, with Q1 doing the servo opamp's
> job to keep the current thru the reference transistor constant.
> Doesn't it need a capacitor from pin 1 to pin 2 of the transistor
> array to prevent oscillations ?
>

    Sorry, since I never built one, I don't know anything really about
the circuit...Personally, I don't care much for heated designs.

>
> JH.

--
 -Jim
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