# Cooling Case Fans to keep VCOs in tune?

**URL:** <https://lookmumnocomputer.discourse.group/t/cooling-case-fans-to-keep-vcos-in-tune/3866>\
**Category:** KOSMO MODULES\
**Created:** [August 7, 2021, 7:39pm UTC](https://lookmumnocomputer.discourse.group/t/cooling-case-fans-to-keep-vcos-in-tune/3866 "2021-08-07T19:39:06Z")\
**Posts on this page:** 1\
**Showing post:** 20

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**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\
**Post date:** [August 8, 2021, 4:24am UTC](https://lookmumnocomputer.discourse.group/t/cooling-case-fans-to-keep-vcos-in-tune/3866/20 "2021-08-08T04:24:03Z")

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I don’t see a temperature coefficient specified for any of the polyester film capacitors Tayda carries, but I think 600 ppm/K is typical (see [this](https://www.tdk-electronics.tdk.com/download/530754/480aeb04c789e45ef5bb9681513474ba/pdf-generaltechnicalinformation.pdf)). Mouser carries 1 nF polypropylene film caps with coefficient -200 ppm/K.

(I updated [this](https://lookmumnocomputer.discourse.group/t/1222-tuner-vco-module-fixes-improvements/2072) to recommend a film cap for C6.)

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