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Old 7th May 2008, 07:37 PM   #1
Nordic is offline Nordic  South Africa
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Default TO-3 transistor - best practice?

What is the best way to connect to the transistor case?
2 legs are obvious... but not the case... maybe one of those wire crimps with a hole in, on top, underneath the screw's top?

I'd like to use an insulated sink.
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Old 7th May 2008, 09:09 PM   #2
pilli is offline pilli  France
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This is how you usually see them:

The top is free from cables, and insulated with the mica.
The screws are not insulated from the case.

Underneath, the screws are insulated from the heatsink with a plastic washer, quite the same as those used on TO-220 packages.
One of the screws has a "tabbed-washer" (don't know the name of those things...) to which you can solder the wire, and then a spring-washer to ensure tension, then the nut.


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Old 7th May 2008, 09:10 PM   #3
pilli is offline pilli  France
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...Sorry if the pictures are a "quick and dirty" job, I couldn't find a neat "exploded view" anywhere quick.
Anyway the thick green line represents the heatsink, the thin green line represents the mica; hardware is mounted in the shown sequence.

Edit: You can buy the entire kit (mica + all washers) for 25 cents.


Cheers,
pilli


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Old 7th May 2008, 09:25 PM   #4
pilli is offline pilli  France
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...a neat exploded view can be found on this site (towards the end of the page).
I am not sure I am allowed to paste here the copied picture, so just the link. And it is in French.
(The part labelled "canon" is a "nylon bush", all the rest is metal.)


http://pagesperso-orange.fr/mgiaco/e...htm#Assemblage


(For those who understand French, that page also has an extensive analysis of heatsinking.)

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Old 7th May 2008, 09:56 PM   #5
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Solder a wire to it.(e.g. MF)
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Old 8th May 2008, 12:31 PM   #6
Nordic is offline Nordic  South Africa
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Sweet, thanks, then it seems I have every thing I need...
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