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Old 06-26-08, 05:16 AM   #1
asher Tea
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Angry build your own amp?

I want to get some advice from anyone who has used a car amplifier to make an amp?
I am having problems powering the amp up and wondering if it is due to grounding issues?
Treat me as if I am a layman
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Old 06-29-08, 12:37 PM   #2
gav
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Just so happens I am an expert in this area.
I have built my own amps for over 10 years now.
Firstly, you probably want a car amp that is the smallest you can find, cause these days they are all huge and 'showy'.
100 watt stereo(50 watt per channel is fine)
You've got a red wire, a black wire and a yellow wire for power. Then there are the speaker wires.
Connect the red wire to the positive terminal of your battery ( which I recommend to be a 12volt 7amp sealed lead acid battery), connect the black wire to the negative terminal of the battery.
Here's the bit you may not have read about or realised. The yellow wire is the 'remote on' wire.
I won't explain in detail what it's normaly for but all you need to know is that it also has to be connected to the positive terminal of the battery.

Try it.

Last edited by gav; 06-30-08 at 02:12 AM.
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Old 06-30-08, 08:57 AM   #3
asher Tea
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hey gav, thanks for that. I worked out that I could put the "remote" wire back into the 12V port, then I used it in a sweitch to turn on the amp. All good except my wireless mic transmitter just died, so the saga continues.
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Old 06-30-08, 10:08 AM   #4
gav
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Switching is what it's meant for.
I don't build in a switch on purpose. I just disconnect the battery. No chance of accidently getting switched on and battery going dead.
Can't help you with the mic problem.
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Old 11-13-08, 10:37 PM   #5
shizo
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I just built my own portable bass amp!
Thanks gav for the help.

All you need is an amp, a 12V battery and an optional DC/AC power inverter. I used a 40W/8" bass amp, 120W inverter and a motorcycle battery. It all fits conveniently inside the amp.

If your amp works from DC current, you can connect it to the battery directly, bypassing the internal AC/DC power converter.

Beware that the amp can become very noisy when powered like this (I guess it depends on inverter's quality or the absence of "ground" wire). Test it out first!
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Old 11-14-08, 08:04 PM   #6
jeep caillouet
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It's not the ground wire its the type of wave the inverter puts out.
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Old 11-14-08, 09:19 PM   #7
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The noise is less when I touch the strings, that's why I thought it was a grounding issue. Is it possible to get rid of noise?
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