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Circuitbenders Forum => Circuitbending discussion => Toys => Topic started by: omgphil on October 02, 2007, 10:12:36 PM

Title: Removing tiny SMD resistors
Post by: omgphil on October 02, 2007, 10:12:36 PM
You know the tiny square ones?


I want to replace one with a pot but it's so damn fiddly, it won't come out, and I can't even cut it in half and prise it out D:

Any techniques?


I got a heart shaped necklace with a record/playback function from Poundland t'other day and I'm gunna rehouse 2-3 of them and make a mini super-lofi sampler with pitch control. It's an ambitious project for me but it should be good.
Title: Re: Removing tiny SMD resistors
Post by: Circuitbenders on October 02, 2007, 10:18:38 PM

From another thread.

I think you mean SMD (surface mount devices)

(http://tbn0.google.com/images?q=tbn:bxfOZVyZB375lM:http://www.futurlec.com/Pictures/Resistors_SMD.jpg)

SMD resistors and capacitors (resistors have numbers on them , capacitors not) can easyly desoldered by alternately heating each side for a short time (about 1second each side) with your soldering iron. After a few cycles (heating left, heating right) the part will left the circuitboard (PCB).

 
Title: Re: Removing tiny SMD resistors
Post by: omgphil on October 02, 2007, 10:31:33 PM
Really thanks, that will be useful.

I guess I'lll use the search function next time :X.


Anyone else done a project like this? I'd like to see, for inspiration.
Title: Re: Removing tiny SMD resistors
Post by: soflaed on November 16, 2007, 02:41:26 AM
After removing,how do you solder onto such a small area? starts melting the board.
Title: Re: Removing tiny SMD resistors
Post by: octatone on November 16, 2007, 04:45:56 PM
SMD = Hell.  Avoid at all costs.

Use a low watt iron, low temp, and work with a magnifying glass.  Oh and take a few shots of whiskey to calm the hands.
Title: Re: Removing tiny SMD resistors
Post by: catweazle on November 16, 2007, 09:16:10 PM
If you do your own PCBs you will love SMD, more space (you can use two layers of components)
and the best: you don't need to drill so f**in lots and lots of holes ;)

Don't panic, SMD soldering isn't that complicated, you need a fine good tweezers and
a fine soldering iron, you don't need a SMD Soldering iron. I think on the net you'll find
good tutorials and how to's about SMD soldering,

Soldering a new part on a desoldered one is not much stress. Take the part with the
tweezers and lay it on the pads and hold the part while soldering both ends.
Caution if you solder a smd resistor for example you will see the "thumb stone effect" the part stands up on the
side were you solder - thats why you have to hold it with tweezers.
Take a old pcb and make some excersices, you will see its not mysterious and a big deal,

You can desolder SMD parts real easy with two soldering irons (if you have two)
Heating both ends simultaniously (really really fast method)