Is there any way to build ~14VDC power supply from household current 115VAC that has alot of amperage.....I would like to put a car amp in my home and it pulls around 115 amps at 12VDC so my requirements would be a 13, 14, or 15VDC power supply that can produce ~120 amps. Can one be made from a microwave or something like that? or whats the highest ampreage one i can make around 14 volts?
Well, 115 Amps x 12VDC = 1380 Watts. So at least it's still somewhere in the basic range of being possible to have it run from a standard AC wall outlet in the USA.
You would need a hefty transformer VA rating, obviously, to make a linear supply of that size. But maybe you could use more than one (identical) transformer, running the secondaries in parallel. (Industrial/Control transformers might make it more economical.)
And the rectifiers would need to be quite beefy, rated to handle your current.
You would probably also need to parallel a lot of smoothing capacitors, to get each one's ripple current down to where readily-available caps with reasonable ripple current ratings could be used.
If you can find all of those parts (and I think that you could), then a linear supply should be possible. But that's not saying that you would want to do it that way.
Does it need to be regulated? If so, you'd need a little voltage headroom. But, conceptually at least, even a standard 12V three-terminal regulator should be able to work, for that, if you used enough pass transistors.
That seems like a terribly-'brute force' type of approach, though. You might have to be looking for arc-welder components. 🙂
Here's a nice little summary of many of the considerations needed for designing a simple linear power supply:
http://www.zen22142.zen.co.uk/Design/dcpsu.htm
I hope that someone else will come up with a more-sane-seeming way of approaching this.
You would need a hefty transformer VA rating, obviously, to make a linear supply of that size. But maybe you could use more than one (identical) transformer, running the secondaries in parallel. (Industrial/Control transformers might make it more economical.)
And the rectifiers would need to be quite beefy, rated to handle your current.
You would probably also need to parallel a lot of smoothing capacitors, to get each one's ripple current down to where readily-available caps with reasonable ripple current ratings could be used.
If you can find all of those parts (and I think that you could), then a linear supply should be possible. But that's not saying that you would want to do it that way.
Does it need to be regulated? If so, you'd need a little voltage headroom. But, conceptually at least, even a standard 12V three-terminal regulator should be able to work, for that, if you used enough pass transistors.
That seems like a terribly-'brute force' type of approach, though. You might have to be looking for arc-welder components. 🙂
Here's a nice little summary of many of the considerations needed for designing a simple linear power supply:
http://www.zen22142.zen.co.uk/Design/dcpsu.htm
I hope that someone else will come up with a more-sane-seeming way of approaching this.
Find out what voltage the car amp runs at (+-YVdc) and build a normal PSU to feed that direct and avoid the triple voltage change from 115Vac to 12Vdc and then 12Vdc to XVac and then XVac to +-YVdc.
Hi
So you need to power car amp at home? connect battery and some charger that can charge with 10 or more amps, this will be easy for you, everything else will be much, much harder to do
So you need to power car amp at home? connect battery and some charger that can charge with 10 or more amps, this will be easy for you, everything else will be much, much harder to do
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