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Registered Member #1208
Joined: Thu Jan 03 2008, 05:30PM
Location: Chesterland, OH
Posts: 154
if you REALLY wanted more current, you could rewind the MOT's primary to about 20 volts with the thickest wire you can find, and use those in parallel to get like 400 amps... search instructables for "spot welder"
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
Wow, after sitting idly for nearly a year, this thread has been resurrected. Cool.
Since I wasn't a member when this thread started, I'll add my 2 cents. I have a 1200W MOT that I rewound to almost exactly 20 VDC after being rectified and smoothed (10 turns of 6 AWG). This was for my ZVS driver, but I couldn't resist trying some electrolysis stuff with it. So yes, basic math says it should be able to output around 60A (probably with substantial voltage drop).
But a simple electrolysis cell with 2 rod electrodes has WAY too much resistance to allow that much current. To get 10s of amps flowing you need to have large plate electrodes, and lots of them, very close together.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
another (slightly less risky) method is to parallel lots of MC34063 SMPS converters to generate your 4V at 10A or so (IIRC each one is good for 1.5A and up to 2A pulsed)
I once built a charger this way, you do need to calibrate the output voltages and combine using diodes, but it does work well. -A
Registered Member #1262
Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
I've just been using a big 'ol SLAB for all my electrolysis experiments so far, although I am looking to make a larger electrolysis machine for making hydrochloric acid, as my parents arn't very fond of buying the stuff.
Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
The less expensive method would be adding 10 windings on a 300W toroidal transformer, obtaining a couple of volts, then taking care to reduce all the overpotentials and ohmic losses.
Registered Member #8
Joined: Thu Feb 02 2006, 04:34AM
Location: Harlowton, MT, United States
Posts: 214
How were you planning to get HCl from electrolysis? Were you going to build a simple HCl furnace of some sort that is fed from the cell? Hydrogen and chlorine do not combine without initiation. Keep in mind that even a graphite electrode will be slowly corroded, being removed as liquid and/or gaseous CCl4 and/or CO2. Most metals will be hopelessly attacked to the point that you will not get much free chlorine out.
Registered Member #1262
Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
Hmm that could be a problem, my idea was to combine hydrogen and chlorine byproduct gases and set tiny amounts on fire to produce hydrogen chloride. Then I'd dissolve the HCl in distilled water to get Hydrochloric Acid.
Registered Member #396
Joined: Wed Apr 19 2006, 12:55AM
Location: Pittsburgh, PA
Posts: 176
Backyard Skunkworks wrote ...
Hmm that could be a problem, my idea was to combine hydrogen and chlorine byproduct gases and set tiny amounts on fire to produce hydrogen chloride. Then I'd dissolve the HCl in distilled water to get Hydrochloric Acid.
Sounds like a massive dangerous ordeal that will likely have a very small yield. A gallon of 9M HCl is about $8-10 at Lowes or Home Depot. Maybe your parents won't have a problem with you buying it if they never find out? Just an idea . . .
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Hydrogen fun
Just an idea . . .