-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
Of Brooke Clarke
Sent: Wednesday, June 13, 2007 9:37 AM
To: piclist@mit.edu
Subject: [EE] Flux info -- circuit effects.


Hi:

I built the M3 Semiconductor Analyzer from a kit.  But it failed to pass the 
short circuit calibration.  [PIC]  Uses 16F876 and three 4052 analog switches 
in a very cleaver circuit that recognizes many 3 terminal devices and measures 
key parameters.  http://www.prc68.com/I/MTE.shtml#Xistor

Radio Shack no longer carries flux remover.  But why would flux bother a short 
circuit calibration.  But after getting some alcohol and cleaning the board it 
passed the calibration.  The other problem is that the copper is extra thick 
and my SMT sized soldering iron was not able to heat the joints.  I saw the 
dull color and thought it must be a RoHs lead free PCB.
>>
if you see dull color flux that's water soluble solder it requires to wash
it in the de-ionized water and after that put it oven to dry up.
It has resistance some people do not know about it.
I use regular old flux based solder with 99% alcohol works best. 
<<

Andre Abelian

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com

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