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Old 03-17-2008, 01:41 PM
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Question Class AB pushpull amplifier

Class AB pushpull amplifier

can anyone help me find and design a Class AB pushpull amplifier...
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Old 03-17-2008, 01:53 PM
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Would you clarify your request? Do you want material to aid in understanding such amplifiers so you can independently design one, or do you simply want a schematic?
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Old 03-17-2008, 01:56 PM
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im very sorry beenthere.. well, first i want to understand how a class AB pushpull amplifier works.. and test/simulate a sample schematic..
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Old 03-17-2008, 02:45 PM
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Here's a Wikipedia article on various classes of amplifiers:
http://en.wikipedia.org/wiki/Electronic_amplifier

Attached is a schematic of a simple class AB audio amplifier with a volume control.
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File Type: png AudioAmpVolumeControl.PNG (33.8 KB, 397 views)
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Last edited by SgtWookie; 03-17-2008 at 02:48 PM.
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Old 03-17-2008, 03:02 PM
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thanks for the info sgt wookie... can anybody show me a diagram of a class ab pushpull diagram?? please..
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Old 03-17-2008, 03:07 PM
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Did you look at the attachment to my last post?

Did you read the Wikipedia article?
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Old 03-17-2008, 03:22 PM
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yep tnx master... i hope i can test it correctly..
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Old 03-17-2008, 03:46 PM
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it doesnt work in simulation... why is that??
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Old 03-17-2008, 04:26 PM
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Quote:
Originally Posted by juniorece View Post
it doesnt work in simulation... why is that??
Did you change components, or miss a connection?

As you can see, it works in the simulation I set up.

Note that the junction of D1 and D2 is NOT connected to the junction of the emitters of Q4 and Q5.


Post a screen shot of what you have so far.

While you have the schematic on the screen, hit Ctrl+PrtScr
Then start Paint (in the Accessories folder) and paste the image by pressing Ctrl+V.
Save it as a type .png or .jpg, then attach it to a reply in Advanced mode.
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Last edited by SgtWookie; 03-17-2008 at 04:34 PM.
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Old 03-19-2008, 01:48 PM
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Red face to mr. sgtwokie

mr. sgtwokie.. ive tried this several times but the output is a clipped sinewave.. but thanks i simulated a real amplifying ckts.. hope youll reply to this soon..
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File Type: jpg osci.JPG (96.9 KB, 163 views)
File Type: jpg ABpushpull.JPG (165.5 KB, 277 views)
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