HF PACKER
AMP
V4R6
Page 30
TO-220 Ceramic Washer and MOSFET
The heat sink area should be clean and dry. Use a touch of
alcohol tor maximum clean. The thermal conductive ceramic
washers shown on the heat sink (right) are superior devices
and eliminate short-circuits that can happen with the thin peel
and stick insulators. You can assemble without thermal
compound and it will work but I like to maximize performance. I
prefer to use a thin layer of a thermal compound on both sides
of the washers and the MOSFET back side for maximum
thermal connection. Practically any available thermal
compound will work. My personal choice is Artic Silver. Only a
tiny dab is required. The washers are considerably thicker
(0.08 inch) which puts the MOSFETs closer to the bottom of
the circuit board. An extra washer will be required on the male-
female spacer that screws into the heat sink so that the U4
chip and the male-female spacer come into physical contact.
To aid in keeping the ceramic washers in place, I screw them
down tight and let them set for a while before removing the
screws. This step will encourage the washers to stay in place
during final assembly.
IRF510 MOSFET Lead Bend
Summary of Contents for PackerAmp V4
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