Can a car amplifier run off of a 9 volt battery? - diyAudio
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Old 23rd January 2013, 02:25 PM   #1
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Default Can a car amplifier run off of a 9 volt battery?

Could a 9 volt battery even turn on a small car amplifier? (one that's less than 300 watts)
Or would it have to be 11 volts or higher?
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Old 23rd January 2013, 02:35 PM   #2
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Some amps may power up with 9v. Chip-amps likely would work normally. Amps with switching power power supplies would have a tougher time. If the amp didn't have a low voltage protection circuit, 9v may not be an issue but starting an amplifier's switching power supply with the very limited current that a 9v battery (guessing that you're referring to a NEDA 1604 type battery) can deliver would be a problem. The voltage would drop significantly as the amp started and would drop significantly as the amp produced output. The current draw from the amp would quickly drain the 9v battery.
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Old 23rd January 2013, 07:38 PM   #3
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I am sure those class T chip amps will work
My sony xm1s amp needs 10.5-16 volts to run, the manual says
The output power may also be reduced to 1/2 if you move from 13 volts to 9 volts
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Old 23rd January 2013, 08:00 PM   #4
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How about using 2X 9V batteries (18V) with a 7812 regulator + NPN pass transistor to get regulated 12V?
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Old 23rd January 2013, 08:03 PM   #5
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A 9 volt battery can't produce enough current to operate that type of amplifier.
You can use two of them and a regulator to get 12 volts but you will not get any more current than a single battery can deliver.
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Old 23rd January 2013, 08:52 PM   #6
JMFahey is offline JMFahey  Argentina
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Quote:
a small car amplifier? (one that's less than 300 watts)
"small" and "300 watts" should not be used in the same phrase.

"small" and "1/2W" , as in an LM386 amp is more likely.
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Old 23rd January 2013, 09:16 PM   #7
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300 watts
12Volts * 25 amps
Lm7812 regulator will get very hot trying to convert 18 to 12
its current limit is very low
you can stack up 2-3 dozen of them for 300 watts
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