Re: PCB Etching (again!) - chemicals used


Glenn Ashmore wrote:
> I use Amonium Persulphate in a Kinsten etching tank and it works
great.
> Made a couple of modifications though. Bought a higher wattage
aquarium
> heater at the pet store so I can get the tank up to working
temperature a
> lot faster and made a cover from 1/2" acrylic to reduce evaporation
between
> sessions. I use the same solution for about a month etching 8 to 10
boards.

Ha -- I actually broke my heater for the Kinsten tank on Friday. (Left
the water level slightly lower than 1000ml, and the top of the heater
got too hot and cracken when [much] colder water splashed up on it.)
I've ordered 2 more heaters for it -- I'll probably put one either side
of the tank, to heat it twice as fast. ;-)

I was surprised you got an aquarium heater to get it to the
temperatures required, though -- all the ones I've seen have
thermostats which would limit the temperature to a much lower range.
Did you get one and modify it? Or do you just etch at a cooler
temperature? How much did it set you back?

Cheers,
Michael

.

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