In a message dated 12/11/2002 6:27:37 PM Eastern Standard Time, 
[EMAIL PROTECTED] writes:


> Not sure that "formal" instructions are really necessary. My own informal 
> isntructions might go something like this:
> 
> 1. Bend leads just past neckdown to 90 degrees.
> 2. apply heatsink compound to screw tab (underside of TO-220)
> 3. Insert component.
> 4. Solder component.
> 5. Attach using screw/nut
> 
> 

I'd want to reverse the last two instructions. Once it's soldered, any 
misalignment of the mounting will add stress to the solder joints when you 
screw it down. By screwing it down first, you ensure that only residual 
thermal stresses are left in the solder joints.

Steve Hendrix


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