Help please,need to build a power supply for a car amp for home use

wizkid77 · 15th June 2010, 04:48 PM

I currently have a P200.2 fosgate amps using in my house powered by a 350w computer power supply. However it seem not to have enough power. I notice that while in use the voltage drop from 12v to 10.5v when heavy bass is played and at that point the bass sounds distorted. I am looking for a cost effective solution.
I really don't want to buy a regular home amplifier since I already have a amps.

paulb · 15th June 2010, 04:57 PM

It's cheaper to buy one.

multisync · 15th June 2010, 05:15 PM

I use a 4 x 50 watt JVc car stereo for sound outside in the back yard. The only power that I have available is 220 volts for the pool pump. So I made a 2 amp charger/power supply to feed a marine battery which runs the car radio. The battery is rated at 75 amper hours ie 75 amps @12 volts for 1 hour or 37.5 amps for 2 hours or 10 amps for 7.5 hours etc. So unless you are blasting super loud for long periods of time a battery and a cheap charger will do you.

I live in the country and my son has had several parties and yes even with only 4 x 50 watts the neighbours are glad he doesn't have too many parties.

roredigolo · 15th June 2010, 05:51 PM

Try to use 2 computer power supply, and add at least 4 x 2200uf 16v caps, use a diode to put it in parallel. It´s far from a reasonable solution, but it´s cheap, and you could try .

wizkid77 · 15th June 2010, 06:37 PM

Quote:

Originally Posted by roredigolo

Try to use 2 computer power supply, and add at least 4 x 2200uf 16v caps, use a diode to put it in parallel. It´s far from a reasonable solution, but it´s cheap, and you could try .

You said to use a diode, Could you explain a bit more about connecting the diode.

gmphadte · 17th June 2010, 09:48 AM

If u can go inside and do some soldering/desoldering, it will be easier and then u can use the power amp bypassing its internal DC-DC power supply.

Gajanan Phadte

wakibaki · 10:56 AM

Even with 2 computer supplies, that is not a good solution. The voltage will be down 0.6V before you start. Computer supplies put out most of their current @ 5V.

The suggestion from multisync is good, it will work, it will give you good volume; if you buy a big enough battery it will probably run all day (if you charge it all night). You still need a battery charger though, and the battery will not be that cheap, and it requires maintenance (you have to charge it, not overcharge it, erc.,etc.).

You could buy a power supply but you really need quite a lot of current (probably).

The sensible thing to do is buy a mains power amplifier, maybe secondhand off ebay. It won't cost much more than a decent power supply, and you won't have to faff around. You could sell the car amp on ebay to offset some of the cost, or (better) hang onto it until you have a car you can put it in.

Decide how much power you need (what kind of speakers, how big the room, party or everyday listening), put your rough location in your details, and somebody will make a recommendation.

w

Oh, bypassing the internal supply; not unlesss u're happy taking a substantial risk of destroying the whole thing.

roredigolo · 17th June 2010, 05:04 PM

I´m not sure , if you place a diode in the line of +12v of one power supply you will avoid the return of tension . so don´t try it. forget what I said, do always the right thing, try to use a baterry or buy a expensive apropiated power supply.

15th June 2010, 04:48 PM	#1
wizkid77 diyAudio Member Join Date: Dec 2009	Help please,need to build a power supply for a car amp for home use I currently have a P200.2 fosgate amps using in my house powered by a 350w computer power supply. However it seem not to have enough power. I notice that while in use the voltage drop from 12v to 10.5v when heavy bass is played and at that point the bass sounds distorted. I am looking for a cost effective solution. I really don't want to buy a regular home amplifier since I already have a amps.

17th June 2010, 10:54 AM	#7
wakibaki Banned Join Date: Jan 2008 Blog Entries: 2	Even with 2 computer supplies, that is not a good solution. The voltage will be down 0.6V before you start. Computer supplies put out most of their current @ 5V. The suggestion from multisync is good, it will work, it will give you good volume; if you buy a big enough battery it will probably run all day (if you charge it all night). You still need a battery charger though, and the battery will not be that cheap, and it requires maintenance (you have to charge it, not overcharge it, erc.,etc.). You could buy a power supply but you really need quite a lot of current (probably). The sensible thing to do is buy a mains power amplifier, maybe secondhand off ebay. It won't cost much more than a decent power supply, and you won't have to faff around. You could sell the car amp on ebay to offset some of the cost, or (better) hang onto it until you have a car you can put it in. Decide how much power you need (what kind of speakers, how big the room, party or everyday listening), put your rough location in your details, and somebody will make a recommendation. w Oh, bypassing the internal supply; not unlesss u're happy taking a substantial risk of destroying the whole thing. Last edited by wakibaki; 17th June 2010 at 10:56 AM.

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15th June 2010, 04:57 PM	#2
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	It's cheaper to buy one.

15th June 2010, 05:15 PM	#3
multisync diyAudio Member Join Date: Jan 2008 Location: Carp	I use a 4 x 50 watt JVc car stereo for sound outside in the back yard. The only power that I have available is 220 volts for the pool pump. So I made a 2 amp charger/power supply to feed a marine battery which runs the car radio. The battery is rated at 75 amper hours ie 75 amps @12 volts for 1 hour or 37.5 amps for 2 hours or 10 amps for 7.5 hours etc. So unless you are blasting super loud for long periods of time a battery and a cheap charger will do you. I live in the country and my son has had several parties and yes even with only 4 x 50 watts the neighbours are glad he doesn't have too many parties.

15th June 2010, 05:51 PM	#4
roredigolo diyAudio Member Join Date: May 2010 Location: Rib Preto SP Brazil	Try to use 2 computer power supply, and add at least 4 x 2200uf 16v caps, use a diode to put it in parallel. It´s far from a reasonable solution, but it´s cheap, and you could try .

17th June 2010, 09:48 AM	#6
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	If u can go inside and do some soldering/desoldering, it will be easier and then u can use the power amp bypassing its internal DC-DC power supply. Gajanan Phadte

17th June 2010, 05:04 PM	#8
roredigolo diyAudio Member Join Date: May 2010 Location: Rib Preto SP Brazil	I´m not sure , if you place a diode in the line of +12v of one power supply you will avoid the return of tension . so don´t try it. forget what I said, do always the right thing, try to use a baterry or buy a expensive apropiated power supply.

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