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Old 23rd September 2013, 11:47 PM   #11
HJL857 is offline HJL857  United States
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Join Date: Jul 2009
Location: northern ca.
i am getting mixed ways on how to install, it shows on the ACA build thread
actual white compound being put onto what the instructions say, Mica, IMO from the reviews of this thread its 50/50. So putting the thermal paste on both sides of the Mica
and to the bottom side of the Power JFET WILL NOT HARM THE JFET and the poulated
PCB ? .....would this be concidered over kill ?
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Old 23rd September 2013, 11:58 PM   #12
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The whole purpose of the compound is to fill the microscopic air gaps. The back (metal portion) of the transistor you are mating to the heatsink is not perfectly flat; this metal portion of the transistor is also electrically connected to the Drain pin, hence why you need mica or some other electrical insulator. Apply compound on the transistor, affix mica, apply compound on the other side of the mica that meets the a 'mica sandwich'...the bread is the compound.

Read this:

Mica and Goop

Last edited by MEGA_amp; 24th September 2013 at 12:03 AM.
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Old 24th September 2013, 04:18 AM   #13
HJL857 is offline HJL857  United States
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Join Date: Jul 2009
Location: northern ca.
Thanks for LINK and the analogie "MICA SANDWICH", and to all who helped me with this build thread.
the knowlage that comes from you guys and the Nelson Pass Diyers is so valueble to us newbie's just speaks for itself. Now i have the confidence to solder Power JFETS to the pcb Q1 & Q3. Take care , im off to a cold one and a Mica Sandwich LOL
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Old 24th September 2013, 05:28 AM   #14
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just don't eat that 'mica sandwich'!!
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