Driving max current hi and low from a battery

**Sceadwian** · 5th January 2007 02:26 AM

I've worked at a metal finishing plant (Zinc / Electrolytic Nickle / Zinc Alloy) for 10 years. What exactly are you trying to do on what scale? It sounds like now that you've said plateing that you're trying to do pulsed electroplating with current reverse, but using batteries? You must be using a tiny cell? Even the Hull Cells we use at work for chemistry testing draw 2-5 amps at 5-10 volts.

**mramos1** · 5th January 2007 10:00 PM

Sceadwain:

This one pulls about 300ma. It is Titanium and Zinc with a number of chemicals. It done by hand, the Zinc rods will retore themselves, try to automate it for a friends. I will try relays like Nigel said, then go FET later. I found an EDN circuit that used 2 additional transistos to drive to low millivolts. Just hoping someone might have a simple, low part count circuit.

**Sceadwian** · 5th January 2007 11:42 PM

300ma seems extremely low, even for a tiny cell. You must be plateing only a few tiny parts at a time or at a VERY low rate? I'm not even sure if metals will even properly deposit onto a part's low current density areas with that little current. It's a bit off topic but I'm curious about the specifics of the operation, for my own curiosity if nothing else. As I said our Hull Cells draw 1-5 amps and those are just bath analsys cells and they're only 250mls. Please feel free to private message me here on the forums or e-mail me at sceadwian@yahoo.com if you would like.

**mramos1** · 6th January 2007 12:03 AM

There is a small amount of surface area, thin rods right now. HE does plan on a larger surface at a later date. I will need to be able to drive a few AMPs then (or now) and thought FETs would do that for sure. But for now. Low power is fine. I will get relays tomorrow and make the board for him.

The power is to reclaim the zinc as the chemical reaction in the cells depletes it.

It is an experiment a chemist friend is working on. And he has has it working by hand right now, but wants to automate it to see how long the zinc will last. Change the times, I will probably add some feedback to the PIC later as well once he tells me what he needs.

He is testing a patent.

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