From memory, along with the mica insulators, there are small nylon
shoulder washers that go between the screw head and the tab of the
to-220 package, These washers protrude slightly inside the hole to
prevent the screw from touching the tab at all.
You can find a complete TO-220 kit at Digi-Key PN# 4724K-ND, but they'll
charge you a dollar each (singles)

Lyle Hazelwood

-----Original Message-----
From: Pic Dude [mailto:picdude@AVN-TECH.COM]
Sent: Monday, July 01, 2002 9:42 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: Regulator grounds...


But what type of screw would I use for this, that would take
the heat?

Cheers,
-Neil.



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Benjamin Bromilow
Sent: Monday, July 01, 2002 2:54 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: Regulator grounds...


Hi Neil,

You could use a mica electrically insulating washer between the TO220s
and
the heatsink... AFAIK that should sort it :)

Ben

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