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Old 21st September 2013, 11:17 PM   #1
HJL857 is offline HJL857  United States
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Default ACA JFET install Question.

I have just started the ACA, i am where you put the white heat sink compound on the Mica to the heat sink, My question is do you also put a layer of the white compound to the JFET POWER RESISTOR?
this is a noob question, I would appreciate anyone to chime in.
thanks much !
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Old 21st September 2013, 11:33 PM   #2
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If you are mounting any device to a heatsink, compound is typically required if using mica. I don't think any resistors for aca need to be mounted to a heatsink, so none needed there.

Last edited by MEGA_amp; 21st September 2013 at 11:39 PM.
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Old 22nd September 2013, 06:42 AM   #3
WalterW is offline WalterW  Netherlands
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you probably mean: "MOSFET power transistor" ?
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Old 23rd September 2013, 01:20 AM   #4
HJL857 is offline HJL857  United States
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Default ACA JFET install to Heat Sink

Yes!,
Let me re-word , im following pictures instruction "I THOUGHT" : Thermo paste goes onto the under side of the MICA Fabric which is applied to the Heatsink now the Power JFET is screwed down onto the Heatsink, Then the POWER JFET is attach and soldered to the PCB marked Q1 & Q3 MY Question, should i put a thin layer of thermo paste between the topside of the MICA and the bottom side of the POWER JFET then screw it to the Heat Sink.
MEGA_amp i should have been more clear.
HJL857
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Old 23rd September 2013, 02:51 AM   #5
WalterW is offline WalterW  Netherlands
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Answer is YES. Apply paste at the top side of the mica and or bottom side of the power MOSFET.
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Old 23rd September 2013, 03:00 AM   #6
12B4A is offline 12B4A  United States
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Are you using mica or the kerafol supplied with the ACA kit?

Quote:
Thermo paste goes onto the under side of the MICA Fabric
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Old 23rd September 2013, 03:05 AM   #7
HJL857 is offline HJL857  United States
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Default ACA JFET install to Heat Sink

Thanks Walt W !
NOOB help is Vital, it keeps us in the Electronic Amp building World
HJL857
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Old 23rd September 2013, 03:55 AM   #8
HJL857 is offline HJL857  United States
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Default a

Quote:
Originally Posted by 12B4A View Post
Are you using mica or the kerafol supplied with the ACA kit?
If Mica is the same as Kerafol ,The ''Mica Pads'' are explained in the ACA Build Thread as the Pads used.
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Old 23rd September 2013, 11:40 AM   #9
12B4A is offline 12B4A  United States
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If it's pink and floppy, it's kerafol and you do not need grease at all.
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Old 23rd September 2013, 04:58 PM   #10
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It's so easy:

If you have soft insulators like Silicone, Kerafol or Kapton,
NO compound is required.

If you have hard insulators, you will need some compound
on both sides to fill the microscopic gaps.

Remember air is a very bad heat conductor. Any air gaps
need to be avoided.
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