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Old 29th June 2002, 03:56 AM   #1
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Question how can i use my car amp indoors on 110volts?

this is a stupid question but how can i use my car amp in my house on 110line the speakers and audio i know but how can i convert the 110ac to 12dc?

thanks
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Old 29th June 2002, 04:01 AM   #2
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Well you could use a transformer/bridge/caps power supply but probably better and possibly cheaper would be a switching supply there are alot of commercially available 12V or 13.8V switch mode power supplies. Just get one that is suitably rated and able to supply the peak current demand of the amp
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Old 29th June 2002, 04:20 AM   #3
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One thing I did (quite easily and reliably) with many car amps, was open the amp up and find the supply rails for the audio amplifier itself and then test the voltage they run at. Then I'd find a way to disconnect the amp from it's own step up supply, (usually by removing the rectifiers after the massive power toroid). Then I'd make a power supply for that level(I have a transformer out of which I can get 55 volts at 5000watts which is
90.9 amps, easy enough to vary the voltage with a transistor servo so I could get about 65 volts down to almost nothing.) Then I'd hook the power supply up the amp by connecting it where the rectifier diodes used to be. Only trouble is, you have to be willing to do this little mod to whatever amp you intend to use, and you'd have to have a fairly large transformer for it. But it's less a waste of power than using a 12 volt supply. Only reason I did it was cause I didn't have a 12 supply with sufficient current nor could I build one W/O spending money, but I did have all the right stuff to do what I just explained... So, it may not be your case that you have the right stuff for this, but it's an idea nonetheless
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Old 29th June 2002, 05:23 AM   #4
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uhg thanks?

i'll try radio shack
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Old 30th June 2002, 12:50 AM   #5
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Is there anything wrong with using a car battery, and charging it up every now and then? I believe that they make battery chargers that use line voltages. Of course, you'd have to check on the prices.
-Dan
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Old 30th June 2002, 03:23 AM   #6
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You could indeed use a 12V battery charger assuming you can find one capable of supplying enough current. I would avoid using a 12V battery because I think you'll find the darn thing goes flat too quick.
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Old 30th June 2002, 03:53 AM   #7
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car battery in your house is a bad idea. I've heard stories of people having MAJOR f-ckups doing that.
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Old 30th June 2002, 04:05 AM   #8
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I have done this several times. The idea of overiding the amplifiers power supply is by far the best I've heard.

Car batteries cannot be used inside a house due to the fact that they release toxic fumes during charging. I have twelve 12 volt 7 amp sealed lead acid batteries hooked up in parallel totaling 84amps continous power output. I also have a 80amp current meter and two 30amp breakers hooked up in parallel (allows me to select either 30 or 60 amp "trip" current).

Unfortunately computer power supplies do not work due to the fact that they rarely put out 12 volts even when specified they do. One of the best and most practicle ways to hook up a amp inside is use some sealed lead acid batteries and an automotive battery charger. Run the charger all the time at like two amps to charge the batteries and crank it upto like 10 or 15 amps while your using the amp.

BTW, did you buy this amp at a police auction?

If you need any more help, just lemme know.


======
David
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Old 30th June 2002, 10:46 AM   #9
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Speaking of car batteries, that's the other reason I didn't suggest them. I had a big car amp that I used with some real current hog speakers and I could destroy a car battery beond recharging or ever using again in about 15 minutes. The guts of the battery would just break apart in the pressure of the hot acid and super high current flow!
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Old 1st July 2002, 05:10 AM   #10
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actualy no iu got it out of the dumpster @ custom sounds

whats wrong with it? fuse is blown

radio shack sells some power converters starting at 1000mamp for $15 to 500amp for $200 the 30 amp was $70 to rich for my blood
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