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Old 17th March 2010, 03:56 AM   #1
diyAudio Member
Join Date: Mar 2010
Default Make Amp PSU From Salvaged Parts

I want to make a PSU for a car sub amp to use on a home sub from parts salvaged from second hand store stuff.

I don't want to use PSUs from PCs I want to use a transformer as I am lead to beleive that it's better.

I vaguely know what I am doing but I can follow a schematic and I have completed a year electronics & PC repair course in 1987. I can completely wire a house or a car and build a PC.

So far I know that the amp requires 14.4 volts, have two 30amp fuses, outputs 400watts rms. I checked the specs in the back of the owners manual but no other input specs.

Where can I find a schematic for a project like that? How do I determine the output specifications of the amp? I know I can use the 14.4v but I know that I need at lease on more spec. can I use the 60amps from the combined fuses or can I use the 400watts output?

I don't want to spend a lot on a new plate amp because I have other hardware wants that gets more drool from me but if I can make this quality Alpine car D sub amp work for me cheaply, cool. I already have a 2.21cu. in. 250 watt amp sub woofer
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Old 17th March 2010, 08:06 AM   #2
wwenze is offline wwenze  Singapore
diyAudio Member
Join Date: Mar 2008
The 14.4V input from the car alternator is stepped up to higher voltages by the built-in power supply inside the amplifier, most likely switch-mode.

i.e. I would just give it a power supply with enough amperes and rather modify the built-in power supply instead, if you're looking for better/cleaner power.

If it uses 30 amp fuses 14.4V x 30A x 2 = 864W before the fuse blows 400W RMS output power is probably quite truthful.
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Old 17th March 2010, 12:24 PM   #3
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Join Date: Mar 2010
I am not looking to modify the amp in anyway as i plan on putting it in my next car I want to make a power supply that plugs into a 120 outlet and connect to the amp as I connect power from the alternator.
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