Psu

gurusan · 2nd May 2004, 08:33 PM

What exactly do I need to build a 14.4 volt 30 amp power supply?

a lotta money?

chipco3434 · 3rd May 2004, 12:39 AM

30 Amp? Is this for a heater?

gurusan · 3rd May 2004, 03:50 AM

It's for a sub amp...

I wanted to know if i can build a power supply for a car amplifier

Cro maniac · 3rd May 2004, 08:55 PM

Quote:

I wanted to know if i can build a power supply for a car amplifier

In your case you would be transforming mains voltage to 12V and than again to about +/- 40V in the amp. Efficiency of that circuit would be low.
All car amplifiers with more than 20W on the output have switching circuits inside to raise voltage.
It is good idea to open the amp and measure the voltage behind the switcher (it is usually something between +/- 20 to +/- 50V). Than you only have to build power supply which will have the same voltage you measured inside the amp when it was connected to car battery.

djQUAN · 4th May 2004, 08:36 AM

you could shop around in second-hand stores. I was able to get a 2000W powersupply with a 65A 12V output. very cheap.

also, I got a 12V 27A supply about the size of a PC PSU.

2nd May 2004, 08:33 PM	#1
gurusan diyAudio Member Join Date: May 2004 Location: Oxford, UK	Psu What exactly do I need to build a 14.4 volt 30 amp power supply? a lotta money?

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3rd May 2004, 12:39 AM	#2
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	30 Amp? Is this for a heater?

3rd May 2004, 03:50 AM	#3
gurusan diyAudio Member Join Date: May 2004 Location: Oxford, UK	It's for a sub amp... I wanted to know if i can build a power supply for a car amplifier

4th May 2004, 08:36 AM	#5
djQUAN diyAudio Member Join Date: May 2004 Location: manila	you could shop around in second-hand stores. I was able to get a 2000W powersupply with a 65A 12V output. very cheap. also, I got a 12V 27A supply about the size of a PC PSU.

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