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Solder resist on home made pcbs

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picclock:
Hi
I'm just making some pcb's for a project, photo resist board, uv exposed etc. Some of the tracks are very close to each other and also pass under components. Does anyone know of an easy or trick way to stop the solder bridging these close connections, basically the same as when you put soap or pencil lead on metal you are brazing to stop the flow of the molten metal.

Many thanks

picclock

John Rudd:
Tippex?

PekkaNF:
Flux. Flux pen or whatever PCB-stuff you have. Some modern ones do not need wash, but some you have to remove before use. Closely spaced componenets need flux or all soder runs together and takes way too long to heat up pads/pins without it.

Pekka

John Rudd:

--- Quote from: PekkaNF on October 12, 2012, 07:07:56 AM ---Flux. Flux pen or whatever PCB-stuff you have.
 Closely spaced componenets need flux or all soder runs together and takes way too long to heat up pads/pins without it.

Pekka

--- End quote ---

Which is what he's trying to avoid... :) I suggested Tippex but I've never tried it myself but have heard it works... :zap:

picclock:
Hi

Will certainly check out tippex - if it works its exactly what I'm looking for. Will post the results. Problem with flux, apart from the mess is that if you have a bridge under a component, you can't get to it to apply it and if it does appear to fix it you can't be sure how well. When soldering  chips that have very small gaps between pins have soldered them in place by running the iron along the contacts and then used fine desolder wick to remove the bridging, which works by using capillary attraction to get rid of the excess solder, using the impregnated flux to make the solder flow. After cleaning with Isopropyl Alcohol it looks like a real reflow joint. So flux is a good solution, if you can get to the joint.

Off to try tippex now .. .

Best Regards

picclock

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