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Old 18th February 2006, 04:03 PM   #11
DcibeL is offline DcibeL  Canada
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Sorry, Ractis. It was an LD1085V12. I figured at least a 2A supply is needed, so a 3A regulator should do the trick.
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Old 18th February 2006, 06:32 PM   #12
dnsey is offline dnsey  United Kingdom
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I used a 330F 16V electrolyte capacitor and a ring inductor that looks like a small toroidial transformer. Would that be fine?
You need a cap of about ten times that value (at least), and - if I understand you correctly - a much larger inductor. The secondary of an LT transformer would do for experimenting with.
Think of it this way - the frequencies that you're trying to supress are in the audio band, on a low impedence line, so you need a filter of the same order as a speaker crossover.
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Old 19th February 2006, 05:09 PM   #13
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I've have quite a bit of experience dealing with auto sound and I would have to guess its a ground loop issue.

If your using your cars head unit to supply the audio signal, which I assume you are, make sure the head unit and the t-amp are powered from the same wires. More importantly, make sure the t-amps -12v connection is properly connected. If not, the t-amp will pull the -12v through the RCA ground, very bad.

I've tried my t-amp in about 3 different cars without the use of a regulator and haven't had any over voltage or noise issues.
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Old 25th February 2006, 04:44 PM   #14
ractis is offline ractis  Singapore
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I finally solved the problem by buying a $15 electronic noise filter and putting it before the power supply into the t-amp.

Thanks all for your suggestions!

PS. dnsey, I think you're right. The noise filter I bought is probably a choke/capacitor filter and it certainly feels 20x heavier than the ineffective one I built
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