How calculate the output power - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th October 2005, 10:16 AM   #1
Progg70 is offline Progg70  Sweden
diyAudio Member
 
Join Date: Jul 2004
Location: Sweden
Cool How calculate the output power

I'm curious!
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

Class AB

Regard

Progg70
  Reply With Quote
Old 19th October 2005, 10:31 AM   #2
diyAudio Member
 
wuffwaff's Avatar
 
Join Date: Aug 2001
Location: Ingolstadt Germany
Hi,

"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.

William
__________________
een ooievaar is geen konijn want zijn oren zijn te klein!
  Reply With Quote
Old 19th October 2005, 03:57 PM   #3
Progg70 is offline Progg70  Sweden
diyAudio Member
 
Join Date: Jul 2004
Location: Sweden
Thanks for that.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Lateral MOSFET, How do I calculate power output synonymous Solid State 4 18th December 2007 06:54 AM
Calculate PSU output impedance? jayme Tubes / Valves 1 19th May 2007 07:27 PM
How calculate the output power Progg70 Solid State 17 11th April 2007 09:05 AM
How do I calculate (or measure) my amp's output impedance? Saurav Tubes / Valves 22 27th September 2003 03:55 AM
How do we calculate an amp's input and output impadance? Bricolo Pass Labs 1 13th January 2003 09:26 PM


New To Site? Need Help?

All times are GMT. The time now is 09:16 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2