Timeline for What type of amplifier do I need for this project?
Current License: CC BY-SA 3.0
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| Feb 5, 2012 at 2:44 | comment | added | markrages | An easier way to estimate power, and good enough for your purposes, is to measure the supply voltage and current. Power in is V*I. By the first law of thermodynamics, the amplifier can't put more power into the speaker than it draws from the battery. So watts from the battery puts an upper bound on the output power. You might assume 70% efficiency and multiply the answer by 0.7. If this seems awfully sloppy, consider the ear's logarithmic response. An answer within a couple dB of the true power is probably accurate enough. | |
| Feb 5, 2012 at 2:38 | comment | added | markrages | To measure the power, you will need a sine source and load resistor to replace the speaker. Then you can trust your multimeter's AC RMS range and calculate power as V^2/R | |
| Jan 7, 2012 at 17:15 | comment | added | Carl | Thanks for the reply. Is there any easy way to measure how many watts is coming from the shirt amp? I don't own an oscilloscope, but I do own a multimeter. Also, any idea if this particular amp in the link below would work good? Its cheap, looks very user friendly, and available from hong kong (I believe the amp that you linked to was in UK if I'm not mistaken, never ordered from there, but always get things from honk kong no problem, I'm in the USA) | |
| Jan 6, 2012 at 1:01 | history | answered | Oli Glaser | CC BY-SA 3.0 |