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|19th October 2005, 11:16 AM||#1|
Join Date: Jul 2004
How calculate the output power
Please give me the formula for the output power for power amplifiers.
I'm looking for the formula for:
Single-end class A
Ordinary Class A
|19th October 2005, 11:31 AM||#2|
Join Date: Aug 2001
Location: Ingolstadt Germany
"the formula" is always the same:
P = I*I*R = V*V / R = V*I
The only things you need to know is how much current your amp can deliver, how much voltage your amp can deliver and what the impedance of the load you´re using is.
If you know peak current and peak voltage then rms power is:
Prms = Ip * Vp / 2
This power is only dumped into the fitting load R = Vp/Ip.
When R gets bigger the output is voltage limited an dpower will go down. Here you can use P=V*V/R
When R gets smaller the output is current limited and power will go down. Here you use P = I*I*R
Note that this has nothing to do with how much power the amp will draw out of the mains.
een ooievaar is geen konijn want zijn oren zijn te klein!
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