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Old 16th May 2015, 12:54 PM   #1
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Default Ampere booster 1000 mah to 3000 mah

Hello.

I got a 3.7 v 1000 mah battery but i need 3000 mah for my circuit. What type of IC do i need to use?

- Sebastian
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Old 16th May 2015, 01:44 PM   #2
infinia is offline infinia  United States
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a new battery
mA*H is a rating of energy storage for a certain voltage in this case 3.7V.

your battery should work but last 1/3 as long
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Old 16th May 2015, 04:21 PM   #3
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Okay i thought so, but i need 3000 mah to power two 3 watt speakers any other way i can get 6 watt totat with a 1000 mah battey?
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Old 16th May 2015, 04:37 PM   #4
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The average current when playing music is normally much lower than the maximum, unless you play grunge with the volume turned up to max.

The current needed when idling (silence or very quiet music) is usually very low.

A battery rated at 1000mAh means that, in theory, it will supply 1A for one hour. This is usually measured at 1/10 max current. So it should supply 100mA for 10 hours, and 50mA for 20 hours. Etc.

Speakers labelled 3 watts do not NEED 3 watts of power to operate! That is the maximum power rating. These specs are full of confusion as the distortion at that power is not specified and could be almost anything!

Unless you are trying to run a big disco on batteries, I wouldn't fret about it. Your battery will work, but may need recharging a little sooner that a 3Ah one.
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Old 16th May 2015, 04:41 PM   #5
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Okay so a 1000 mah will be able to supply two 3w speakers with a normally high sound? Im going to use the MAX98306 amplifier.
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Old 16th May 2015, 04:49 PM   #6
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Yes, always state the application when asking a question!

This is a class D (switching) amplifier with a very low idle current (2mA).

The most critical thing here is the efficiency of your speakers, i.e. how much of the electrical power is turned into sound.

3 watts of acoustic power is VERY VERY LOUD! Your speakers are probably no more than a few percent efficient, but even then it could play loud enough to annoy.

How long the batteries last depends entirely on how loud you turn it up and how long you can go between charges.

Experiment with what you have first.
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Old 16th May 2015, 05:17 PM   #7
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Quote:
Originally Posted by cliffforrest View Post
Yes, always state the application when asking a question!

This is a class D (switching) amplifier with a very low idle current (2mA).

The most critical thing here is the efficiency of your speakers, i.e. how much of the electrical power is turned into sound.

3 watts of acoustic power is VERY VERY LOUD! Your speakers are probably no more than a few percent efficient, but even then it could play loud enough to annoy.

How long the batteries last depends entirely on how loud you turn it up and how long you can go between charges.

Experiment with what you have first.

Okay thank you.
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