Author Topic: ac electro etching  (Read 83 times)

nottingham82

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ac electro etching
« on: December 03, 2017, 12:57:17 AM »
So if you are electro etching.  DC removes metal and AC makes it black.  Ideally you want to do both.  I used an old ac to dc converter from goodwill to do my dc etching and it works great.  Etching ac at 110 is a bit dicey.  Does anyone know a common household item that steps down 110 ac to like 30 volts ac?
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Stonemull

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Re: ac electro etching
« Reply #1 on: December 03, 2017, 03:54:05 AM »
what current do you need ?
a cheap arc welder will be around that range or a little higher.

30v AC rectified would be around 45V DC .. I can't think of much in the electronics region that would be around that apart from a mid range stereo amplifier, so maybe grab a junk stereo. Probably needs to be an old one though, you need the power transformer from it, a modern one is likely switch mode.

edit: I had a scrap hitachi HA-250 sitting in the wet grass outside the shed to go to the dump.
the 2 filter caps are 40V 5600uF so probably 70v or so rectified, or roughly 50V AC centre tapped, so 25V AC per side at a few amps.
« Last Edit: December 03, 2017, 04:07:02 AM by Stonemull »
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ThothLoki

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Re: ac electro etching
« Reply #2 on: December 03, 2017, 08:45:47 AM »
Furnace transformers or door bell transformers are ac voltage. They are usually stepped down from 110 to 12-24ac

They are cheap too $6-12
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ggallant571

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Re: ac electro etching
« Reply #3 on: December 03, 2017, 01:47:17 PM »
I think we need a filter on ideas from Nottingham. Every time he posts it costs me another 500 hours.
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