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Old 26th July 2006, 04:36 AM   #1
yugaaa is offline yugaaa  India
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Default Power Amp limiter

I was wondering if anyone has a circuit which can limit the power drawn by the amplifier when the car ignition is switched off .

I use the stock battery which came with the car ,the battery must most probably be a 70Ah one ,though I am not sure about it .

The car is a brand new one ,so I dont want to replace the alternator and and mess up with the warranty .

I had been on a date last week ,and I was doing around 50kms /hr . I had replaced the headlamps to 90/100w and with the amp turned on ,the battery got drained and ,my car had stalled .

It was embarassing for me to ask my girl to push the car to start it .

could anyone help me out with a current limiting circuit for the amp ,so that the amp dosent draw more current than what the amplifier can supply ?
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Old 26th July 2006, 08:43 PM   #2
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I don't know what the current capacity of your alternator is but unless you have a VERY powerful amplifier, the battery should not have been drained to the point where the engine stalled. Charge the battery and with the engine running, measure the voltage across the battery terminals. It should be at 13.5 volts or higher.

If the alternator is working properly but simply can not support your audio system, you need to use a second battery and a battery isolator. This will prevent the amplifier from draining the main battery.
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Old 27th July 2006, 03:25 AM   #3
yugaaa is offline yugaaa  India
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perry ,

sorry for being too naive ,but what is a battery isolator ?

I havent heard of any such thing .
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Old 27th July 2006, 04:17 AM   #4
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http://www.bcae1.com/battiso.htm

You would likely use the first type shown on the page (diode type isolator).
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Old 27th July 2006, 01:17 PM   #5
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It's called the volume control...

A little bit of self control goes a long way
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Old 27th July 2006, 09:59 PM   #6
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I once ran 680W of amps from a 37A alternator..
Never stalled,but man did it make the headlights dim at a stop light..
Once I found out the (puny!) rating of the alternator,out came the amps...

Get your charging system checked out,it seems something isn't quite right...(unless,as already mentioned,you've got massive amplifiers in there,and a stock charging system.)
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Old 27th July 2006, 11:42 PM   #7
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Quote:
Originally posted by DigitalJunkie
I once ran 680W of amps from a 37A alternator..
Never stalled,but man did it make the headlights dim at a stop light..
Once I found out the (puny!) rating of the alternator,out came the amps...

I'm currently running over 2200w in amps off of the stock 80A alternator with no problems.

My vote is for a bad alternator, you REALLY have to have it cranked (and have massive amps) to run the battery dead with the car on using music, and stall out the car on top of that. Unless you have a 2000rms+ amp and were playing test tones at full volume with the girl in the car, my guess is you have a bad alternator...
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Old 28th July 2006, 12:30 AM   #8
Jexx is offline Jexx  United States
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Ditto to the above post.

In addition, once the battery is drained, it has sustained permanent damage. It will not charge to full capacity...You might need to get that replaced as well...
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Old 1st August 2006, 09:37 AM   #9
yugaaa is offline yugaaa  India
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Thank you guys for the information .

Perry ,thx a lot ,your site was very informative .
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