AVR-Chat

----- Original Message ----- 
From: "Brian" <blue_eagle74@yahoo.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Wednesday, June 27, 2007 11:54 PM
Subject: [AVR-Chat] Re: Placing and soldering SMD parts for prototypes - OT?


>I do this stuff everyday at work. It even works on QFP100 and bigger
> with 10mil pitch. Place your part on the board, hold the center down
> with your finger. Place flux at four spots, one on each side and
> touch with a clean iron to tack and hold it there. next, flux all for
> sides with liquid (water soluble flux), place a small amount of
> solder on the tip of your iron and using the weight of your iron ONLY
> (do not put any extra pressure or you will bend pins) and drag from
> one side to the other. if done right you can, or I can, solder the
> whole thing in 15 seconds.

The technique is called drag-soldering. I use a special mini-hoof cartridge 
(it holds a small amount of solder) for it with my Metcal system.

Leon
--
Leon Heller
Amateur radio call-sign G1HSM
Yaesu FT-817ND and FT-857D transceivers
Suzuki SV1000S motorcycle
leon355@btinternet.com
http://www.geocities.com/leon_heller