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Caleb D asked How can I control voltage?
I'm looking at this power supply here: http://www.amazon.com/Pyramid-PS21KX-Amp-Power-Supply/dp/B0002JTD2A It's a Pyramid PS21KX 20 Amp Power Supply. If you take a look at it, all it has is an on/off switch, but nothing to control voltage. Now my end goal is to control amps, but I've been told that there is only an indirect way of doing this-by controlling the volts. So instead of going out and spending over $500 on a high amp adjustable power supply, is there something that I could plug this unit into in order to control the volts (amps)? I'm building an HHO generator. I'm not incredibly tech savvy so building some kind of circuit might now be my thing, but I'm always up for a challenge. So, ya, my purpose is for an HHO generator. I want to start out small (low amps) and then gradually increase the power to make sure everything is going smoothly.
And got the following answer:
Can you give more information? Do you really need 20Amps? What is it for? Is it something that needs a permanent installation? Or just for a temporary project? Why do you need to control the current specifically? Can you do soldering? There are simple circuits you can make yourself. Additional Details: OK you could try something like this, second hand but cheap. Only gives you voltage adjustment, but theres an amp meter, so you just wind up the voltage until it hits the amps you need. http://cgi.ebay.com/BK-Precision-1688-DC-Power-Supply-High-Current-/110616907909?pt=BI_Signal_Sources&hash=item19c1481085 Heres the manufacturer specs http://www.bkprecision.com/products/model/1688A/20a-3-14v-dc-power-supply.html Read what it says about the current supply being low when the voltage is low. If you are keen on doing a DIY supply you can start with an old PC supply, a 400w supply should put out 25A on the 12V rails combined, it also has +5V and 3.3V rails typically, that can cough up even more current. Making it variable at such high currents will be an issue, but you can make low current regulation circuits with just a few components, like this one: http://cgi.ebay.com.au/5V-9V-12V-24V-Voltage-Regulator-Stabilizer-Circuit-PCB-/170579936031?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item27b75b431f Only 1 Amp though...