The Shop > Electronics & IC Programing
Digital oscilloscope project/kit
wheeltapper:
How many do you need? One holds the tweezers, one holds the iron / air gun.
if you are using an iron you pre-solder one pad, then hold the component in place and reflow the solder, then do the other end with solder.
With a hot air gun you use solder paste.
simples.
Roy.
PK:
A deft hand on an iron is better for assembly, but hot air is essential if you are ever going to remove a chip with more than two solder pads.
PK
wheeltapper:
Very true.
I managed to remove a 16 pin chip from an old board, no trouble.
Roy.
awemawson:
I've done that with 16 pin surface mounts using a 50 watt Weller TC iron using low meting point solder 'additions' to keep it fluid long enough. Flood the leads with low melt solder, remove the chip with a cocktail stick, clean up with solder wick.
Back in the early days of 7400 series logic - all through hole of course - I used to salvage chips off boards by the simple expedient of putting a 14 or 16 pin i/c inserter clip on the victim, and flashing the back of the board with a blow lamp while pulling on the clip. Not recommended if you want to reuse the board though with care surprisingly little damage was done. The occasional plated through hole would come as well leaving the chip looking as though it was wearing trousers :lol:
hopefuldave:
Sounds like the IC "reclaimer" I saw who turned a blowlamp on the solder side then bashed the boards on the bench - 95% removal rate, and they *looked* fine...
Dave H. (the other one)
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