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  • How to Make a Professional Printed Circuit Board: the Complete Guide

    For the last 31 years I've used a mix of hydrohloric acid 30% strength, hydrogen peroxide 30% strength and diluted it with 1-2 parts of water. Use a small container, bathe the board about 3cm deep. (for example 50ml hcl, 50ml h2o2 and 100ml water) change ratio when you use stronger or weaker stuff. (if you use 10% strength don't dilute, 3% doesn't workt) The mix etches the board with perfect results in about 1-5 minutes. Do it outside, it fumes unhealthy stuff. Strong peroxide is very bad for skin and clothes. When done, neutralize the acid with plenty of soda till it stops fizzing and flush thru the toilet. The only thing going down the drain is soda, salt, a bit of peroxide that will very quickly turn into oxygen and water and a gram or so of copper hydroxide (basically rusted copper...

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    For the last 31 years I've used a mix of hydrohloric acid 30% strength, hydrogen peroxide 30% strength and diluted it with 1-2 parts of water. Use a small container, bathe the board about 3cm deep. (for example 50ml hcl, 50ml h2o2 and 100ml water) change ratio when you use stronger or weaker stuff. (if you use 10% strength don't dilute, 3% doesn't workt) The mix etches the board with perfect results in about 1-5 minutes. Do it outside, it fumes unhealthy stuff. Strong peroxide is very bad for skin and clothes. When done, neutralize the acid with plenty of soda till it stops fizzing and flush thru the toilet. The only thing going down the drain is soda, salt, a bit of peroxide that will very quickly turn into oxygen and water and a gram or so of copper hydroxide (basically rusted copper) which isn't dangerous to plumbing or much of an environmental threat.

    Yes, I used to buy extra thin single sided boards, dril 2 holes in both layers, align them with pins and the glue them together with expoxy glue. There are also rivets for sale that can be used for the vias. Lot of work and not always very reliable.

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  • Is the best PCB etchant in every kitchen ?

    Whiten teeth? I assumed it was restricted to keep people from making aceton peroxide and blowing things up.

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