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High voltage and higher power output - what heat sink are you using?

 

Good evening all. I've been wondering what strategies people are using to increase heat dissipation off the IRF510 final amp when running higher power output level? Is there a logical replacement heat sink used? Or is there a way to integrate additional heat sink metal to dissipate heat? What have those of you running higher power using since the existing heat sink is insufficient for higher than standard power levels? Could a fan be used successfully with the existing heat sink if running 20-25 watts, which appears to be the maximum push for the 510? Thanks for your ideas. 73 - W4USF?
 

John:? At first, I had a little muffin fan on the stock heat sink.? But I didn't like the noise and I kept getting my fingers in the blades.? So I did this:
?? Be sure to read ZL2DEX's wise counsel in the comments.?




On Friday, January 13, 2017 7:12 PM, John Daly via Groups.Io <wa9whd@...> wrote:


Good evening all. I've been wondering what strategies people are using to increase heat dissipation off the IRF510 final amp when running higher power output level? Is there a logical replacement heat sink used? Or is there a way to integrate additional heat sink metal to dissipate heat? What have those of you running higher power using since the existing heat sink is insufficient for higher than standard power levels? Could a fan be used successfully with the existing heat sink if running 20-25 watts, which appears to be the maximum push for the 510? Thanks for your ideas. 73 - W4USF?
don frasher
 

What I have done with other projects is to mount the output transistor remotely.. ?This allows for easy use of the case itself as a heat sink, as well as makes it easier to use "junk box" heat sinks that do not fit the printed circuit board.
? Surprised I have not seen this option all ready mentioned.. pretty simple matter of removing the 510 and running wire.

73
Don Frasher ?AD7LL
 

Thanks, Bill. On another note, thanks for Soldersmoke and your QRP book, which I read 3-4 years old. Will take a look at your information. 73 - w4usf
 

If you "remote" the 510 by adding even a small amount of wire you run the risk of turning that amplifier into a big ugly oscillator (been there, done that!). One of the reasons the BITX 40 amp is so trouble-free is that the layout is good and the leads are very short.? 73? Bill N2CQR


On Friday, January 13, 2017 8:14 PM, don frasher via Groups.Io <donfrasher@...> wrote:


What I have done with other projects is to mount the output transistor remotely.. ?This allows for easy use of the case itself as a heat sink, as well as makes it easier to use "junk box" heat sinks that do not fit the printed circuit board.
? Surprised I have not seen this option all ready mentioned.. pretty simple matter of removing the 510 and running wire.

73
Don Frasher ?AD7LL

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