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How powerful is this amplifier?

I bought this amplifier kit and I'd like to know what its capabilities are.   I was going to make a Chu Moy headphone amp but remember that I bought this a while ago and never did anything with it.  I'm going to guess that this isn't a top-notch amp, but I was wondering what I could get away with by using this.  

Specs:

music power output: 7W / 4ohm
RMS output: 3.5W / 4ohm or 2W / 8ohm
total harmonic distortion: 0.05% (1W / 1kHz)
frequency response: 20Hz to 20kHz (-3dB)
signal/noise ratio: 86dB (A weighted)
input sensitivity: 40mV / 150Kohm
overload and short-circuit protected
supply voltage: 15V DC (8 to 18V DC possible) / 0.5A
dimensions: 2.2 x 1.4"

I'm assuming that this would be good enough for use as a headphone amp?  Would I be able to run this off a 9V battery?

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Justin Lam (author) 6 years ago
Hm, doesn't seem like it's an entirely efficient amplifier. And yeah, since it's mono, it wouldn't be good for headphones. Come to think of it, it'd probably only be good in amplifying one speaker cone anyway, correct?

Any ideas on what nifty project I could use this amp for? Doesn't seem like it'd be ideal to have it run off of batteries.
verence6 years ago
Loud enough for headphones? Yep. 2W directly on the ear is loud.
Good enough for headphones - depends on the quality you are after.
Able to run from 9V battery? Assuming, you mean a PP3 battery, a fresh one can drive it but it will stop working, once the battery voltage drops below 8V (if the data given is correct) And if the device really needs 0.5A of current, the battery voltage will drop fast.
For headphones, it will be more than loud enough on 9V., but you will need TWO of them, for stereo.

Steve
rickharris6 years ago
More than enough.looks like it is mono though.
lemonie6 years ago

It ought to drive headphones, yes.
Two 9V batteries.

L