OPA541 power rating
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 7th May 2003, 06:15 PM #11 daatkins   diyAudio Member   Join Date: Aug 2001 Location: Bath, UK It works out as half through the maths although the correct way to calculate is to multiply the swing by 0.707 (the reciprocal of the square root of 2). If the supplies are +/-20v, your peak output swing will be 16.4v whereas the RMS will be 16.4 * 0.707 = 12.6v. This will result in an RMS current of 1.45A into 8R, giving 16.82W RMS output power. Nice one, David.
 20th September 2013, 08:34 PM #12 lawbadman   diyAudio Member     Join Date: Mar 2003 Location: St. Catherine, Jamaica sooo for a +-35 power supply i would get 8 ohms 35-3.6=31.4 (31.4*31.4)/8 = 123watts 123*0.707=87 watts rms correct??? for 4 ohms = 246 watts 174watts rms correct??? Can two OPA541 in parrallel handle this power without plowing up? __________________

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 21st September 2013, 05:43 PM #13 AndrewT   diyAudio Member   Join Date: Jul 2004 Location: Scottish Borders no. no. __________________ regards Andrew T. Sent from my desktop computer using a keyboard
 22nd September 2013, 09:52 PM #14 lawbadman   diyAudio Member     Join Date: Mar 2003 Location: St. Catherine, Jamaica so then how do I calculate the power output? __________________

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stratus46
diyAudio Member

Join Date: Nov 2009
Location: Los Angeles
Quote:
 Originally Posted by lawbadman so then how do I calculate the power output?
You take the Peak Voltage and multiply time .707 ( square root of 2 divided by 2). Square the result and divide by the load resistance. So your 31 Volt peak output is 21.9 Vrms. Squared is 480.35 and divided by 8 is 60.04. BTW it's hard to get accurate to 3 digits.

If you're measuring the Peak to Peak Voltage you will need to divide by 2 to get to the peak Voltage or else you'll get an answer 4 times larger than it should be.

It gets a little more interesting as the power supply varies with the power output which is why power is specified with continuous sine wave drive. ALSO, the power varies when the line Voltage changes as well. If you measure power with 117 Volt line an the line goes up to 125, a ratio of 1.068 %, the power can go up 1.068 SQUARED or 1.14.

This must be done with a scope to stay out of clipping.

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