Simplest class B Amplifier - Page 5 - 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 7th June 2005, 07:09 AM   #41
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
W=I^2*R = V^2/R = I*V
If V is rms then W is rms equivalent.
If V is peak then W is peak = 2*Wrms when dealing with sine waves.
You use the version of the formula that you have values for. You don't need to do a current calculation in between if you don't have a value.

If the +Vrail is 24Vdc and you can swing to within 5V of either rail when loaded then the pk to pk swing is 24-(2*5)=14 and Vpk=7v.
Close to your 12.5Vpp quoted but not near 10.5Vpk=21Vpp.

10.5Vpp =5.25Vpk Wpk=Vpk^2/R =5.25*5.25/8 = 3.4Wpk = 1.7Wrms.

If you don't agree on any of this come back.

But please define your voltages, currents and power as either rms, pk or pp if there is risk of confusion to the reader.
__________________
regards Andrew T.
  Reply With Quote
Old 8th June 2005, 12:12 AM   #42
diyAudio Member
 
Join Date: Jul 2002
Location: Naptown
Like I said, I should have clearified that I measure from peak to peak. And that's what i said in the second post:

Quote:
And since I was measuring Peak to Peak, the amp stays within 5 volts of the positive rail and 5 volts of ground with about .66v input.
As for the swing, with the bias set at 12V at the sources of the Fets, the swing is from 6.75 v to 17.25 v. This is within 5v of positive and 5v of ground (IE, within: 5v to 19v).

I have to admit that it's post like this that make me refrain from posting at all. I was simply demonstrating a 'Simple AB amp', with my own interpretation of it.
  Reply With Quote
Old 8th June 2005, 02:55 PM   #43
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
please keep posting useful info especially to beginners asking for guidance.
I reluctantly had to correct the error otherwise that newbie and any others reading the thread would be totally confused.
If you had avoided the watts conversion the whole problem would have gone away and the relevance of your post would have been just as good.
__________________
regards Andrew T.
  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
ISO "Simplest" possible amplifier dano12 Solid State 32 27th February 2009 10:07 PM
Simplest class D ever Rikard Nilsson Class D 3 9th November 2008 07:09 PM
simplest amplifier possible with BJT's? rmgvs Solid State 123 10th July 2008 03:05 AM
LM3886 GC - "Simplest Ever Amplifier Bridging" jweber Chip Amps 20 18th June 2006 02:55 AM


New To Site? Need Help?

All times are GMT. The time now is 04:21 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