I have a speaker with the following specs:
Impedance: 4Ω
Frequency Range: 35Hz~22KHz
Sensitivity: 91dB/W
Max. Power: 650 W
Rated Power: 75 W
Power Supply Voltage: 12V
Is there any amplifier (which can be powered with up to 12V) that can work with arduino for this speaker? I have already used PAM8403 for a low wattage speaker (<3Watts). Thank you.
Power like 75 to 650 Watt from 5 volt supply? Bring down the moon I would say.
I see...I change my question and remove the requirement to power the amp with 5V. I can power it with 12 V.
That depends on the amplifier You didn't tell about.
Please read the first topic telling how to use this forum.
Helpers help You correct a failing design but helping You to write the initial question..... No, no, no. Wasting helpers time.
Just a hint but audio is audio. They make amplifiers like that for cars. I have seen them advertised at over a kilowatt. They do require a lot of current, many are connected directly to the battery with heavy gauge wire. Good luck and let us know how yo do!
12V limits the available power -
Power can be calculated as Voltage squared/Resistance.
That's RMS voltage... With 12V power suppl and a "regular" amplifier that's 12V peak-to-peak or about 4V RMS, or with a bridge amplifier you can double that.
So that works-out to about 4.5V with a standard amplifier or 18W from a bridge amplifier (with a 4-Ohm speaker).
(High power car amplifiers have a built-in voltage booster.)
It depends... The "regular Arduino" doesn't have a DAC, so no true-analog output. That's OK for square waves (like the tone() function as long as you put a capacitor in series to block the "DC component" (to make a square wave that swings positive & negative like a regular audio signal. Many amplifiers already have a capacitor on the input but if you're not sure, add one.
If you're using TMRpcm that can potentially be a BIG PROBLEM. It's actually putting-out PWM which is "nasty" high-level high-frequency signal that can potentially do "bad things" to an audio amplifier. I wouldn't use TMRpcm with my good stereo amplifier.
With a 12V source (assuming no boost converter) the maximum (albeit distorted) power you can attain is:
12V can supply +/- 6 volts to the speaker.
With a sine wave input the RMS voltage of +6 volts is 6 * 0.707 = 4.2V
RMS Power = E * E / R = about 5 watts.
Peak power = 6 * 6 / 4 = 9 watts.
If you look at he equation you will notice the power increases as the square of the voltage.
Simply stated if the voltage doubles, the power increased by a factor of 4.
So you see a 12V power supply
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