Only works half the time, transistor switching on by itself

Thread Starter

thieaux

Joined Jan 31, 2013
13
You should not use acetone to clean printed circuit boards. It is very flammable and too strong a solvent which can harm both you and the circuit.

It is better to use isopropyl alcohol. You can get it as rubbing alcohol at your local drug store. Get the highest concentration they have -- typically 70 percent.
ohhh yeah, not acetone per se, nail polish remover, its just that my mom calls nail polis remover acetone and has stuck with me, i think the label said something like 50% acetone...but anyway good to know, thanks
 

Thread Starter

thieaux

Joined Jan 31, 2013
13
Thanks guys, i thought i had updated the thread , apparently i dreamt it , well anyways the problem has been solved, it seems that the flux i used can conduct in such a manner to allow the transistors to switch on, after a scrubbing it all went according to plan:)
 

Thread Starter

thieaux

Joined Jan 31, 2013
13
Why not use a 2N7000 FET, Darlington equivalent, instead of a bipolar Tr?
Max.
Believe it or not, never had the need for a mosfet, so i have no experience with them other than basic theory, right now im reading up on them, cause i need to switch a 10a load on a logic level, and have been learning about the rds and such...any tutorials are welcomed
 

RichardO

Joined May 4, 2013
2,270
not acetone per se, nail polish remover, its just that my mom calls nail polis remover acetone and has stuck with me, i think the label said something like 50% acetone
I believe that nail polish remover has some additives (oils ?) to soften the skin. The "oils" will have unexpected effects on the circuit. Again, do not use any cleaning agent with acetone in it.
 
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