[sdiy] CA3096 Temperature Controlled Question

[Grant Richter]

Hello,

I have tried this approach. I noticed the PNP transistors in the CA3096 have
a rather high Rbe and you may need quite a lot of compensation for the log
converter. Assume you will need to use a Rossum compensation, a De Franco
scheme will require up to 10K in series with the timing cap.

The typical temperature for thermo stabilized dies is just above the highest
ambient temperature expected. 130-140 degrees F is typical, watch out for
oscillation in the thermal loop which will show up as pitch cycles. If the
loop will not stabilize, use different transistors for heater and sensor.

> From: "M. Falconi" <thermen at libero.it>
> Reply-To: owner-synth-diy at dropmix.xs4all.nl
> Date: Fri, 04 Jan 2002 01:23:56 +0100
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] CA3096 Temperature Controlled Question
> 
> I Built  temperature control as in National semic. AN-299 modified by
> Rick Jansen.
> I used a CA 3096 instead CA 3046, i need of two PNP/Matched transistor
> for my log converter.
> The circuit work well ! I test at 35 C° on the chip for many hours , all
> ok.
> 
> But i have a question: What is the correct temperature I will have work
> the chips , for work my converter well and no burn the ic?
> 
> Excuse me for my english
> 
> Thank you
> 
> Maurizio
> 
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> 
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>