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Re: heat sink upgrade #bitx40 #parts

 

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Dave that¡¯s a great idea with the fan powered on only when in transmit I might do the same thing here. I¡¯ve got a few very small fans here salvaged from somewhere and they are quiet too.?
Have you done any other mods? I¡¯ve done my version of the thump mod and waiting for parts to flatten out the driver amp response. I¡¯m also doing the mic amp gain increase mod too.

Skip Davis, NC9O?

On Apr 24, 2018, at 23:15, davesters@... wrote:

Thanks for the advice Skip.?
Did some long transmissions on 40 and indeed the power transistors did get pretty hot. I had not noticed it.?

Went to my box of computer parts and pulled out a nice brushless computer fan. Thought about putting a circuit to turn on the fan when the tx is on. After a couple of minutes I did the more expedient route and wired the fan directly into the power supply It runs anytime the PS is running. My experience with larger heat sinks is that a fan easily Trumps a larger heat sink.?

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