Homebrew PCBs

----- Original Message ----- 
From: "Mike Young" <mikewhy@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, November 30, 2005 11:39 AM
Subject: Re: [Homebrew_PCBs] Paste!


> "A watched board never reflows". I'll time it next time, and calibrate the
> knob. I turned off the heat as soon as all pads "popped", and let it cool
> undisturbed. That should be a usable profile as long as the ramp up isn't
> too aggressive. I'm a little nervous now, with SMD caps going onto the 
> next
> board.

I just tried a Weller Pyropen for mounting a QFN chip with solder paste I 
got as a sample. I had trouble applying the solder paste, it wouldn't stick 
properly, so I used too much in a couple of places. It worked fairly well, 
although I'll have to clean up the excess solder blobs with some desoldering 
braid. Perhaps I should have applied a little gel flux first to make the 
pads sticky. That paste is probably intended for use with a stencil.

I've ordered a syringe of a different paste that is intended for manual 
application. That should work a lot better.

Leon 

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