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I went with the adapted Electronotes design because I'm using the full, temperature compensated exponential version on another project - it seemed like a good idea to stick with one circuit that I knew worked.<br><br>The linear version I'm using is driving a VCA - so it's not pitch critical and I'm not seeing any temperature effects under normal use (unless e.g. I hold the circuit under a heater or some such...)<br><br>...but I was still curious if there was the possibility of temperature compensation on the linear parts.<br><br>Thanks,<br><br>/ J <br><br>-----Original Message-----<br>From: Nathan Trites [nathan@idmclassics.net]<br>Received: 12.11.2016 18:37:15<br>To: Justin Owen<br>Cc: SDIY List<br>Subject: Re: [sdiy] Linear current source - temperature compensation?<br><br>Is there any reason for sticking with the electronotes design? If the<br>tempcos are only there to compensate for the temperature effect of the<br>transistors, if you do away with the transistor pair altogether theres no<br>reason for them.<br><br>- N<br><br><br><br>On Sat, Nov 12, 2016 at 8:29 AM, Justin Owen <juzowen@gmail.com> wrote:<br><br>> Hello,<br>><br>> The classic Electronotes current source has a linear input. It's possible<br>> to chop out some of the exponential parts and just have a linear current<br>> source based on that design - however, you lose the two standard Tempco<br>> placement positions.<br>><br>> So - is it possible to temperature compensate a linear-only current source?<br>><br>> 1) Please ignore the component values...<br>> 2) I'm assuming the same temperature variation/dependance exists in the<br>> linear version...<br>><br>> <a href="http://www.sdiy.org/juz/source_exp.png">http://www.sdiy.org/juz/source_exp.png</a> - exponential<br>><br>> <a href="http://www.sdiy.org/juz/source_lin.png">http://www.sdiy.org/juz/source_lin.png</a> - adapted to linear only<br>><br>> Thanks,<br>><br>> / Justin<br>><br>><br>><br>> _______________________________________________<br>> Synth-diy mailing list<br>> Synth-diy@synth-diy.org<br>> <a href="http://synth-diy.org/mailman/listinfo/synth-diy">http://synth-diy.org/mailman/listinfo/synth-diy</a><br>><br>
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