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Old 2nd June 2005, 12:13 AM   #1
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Default Simplest class B Amplifier

Anyone has a simple Class B Amplifier ?
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Old 2nd June 2005, 03:13 AM   #2
Leolabs is offline Leolabs  Malaysia
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What for?????
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Old 2nd June 2005, 03:17 AM   #3
Duo is offline Duo  Canada
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I do have some very simple class B ideas.


If you want extreme simplicity, I suggest an opamp and diode biased output stage. This can be accomplished with a minimal amount of components and operate with fair audio quality at low distortion if done properly.
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Old 2nd June 2005, 04:57 AM   #4
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I want a simple audio amplifier with discret components.

The input stage can be a op-amp.
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Old 2nd June 2005, 05:20 AM   #5
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Here you are then.

Still leaves room for embellishment. RtoR. Good for sub.
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Old 2nd June 2005, 06:40 AM   #6
AndrewT is offline AndrewT  Scotland
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Hi Amplifierguru,
Looks like a CFP using FETs
Should the Vgs +Rs be fed from the Vce of the driver?
or from a resistor in the collector supply of the driver?
How does the VAS determine it's voltage gain? There is no feedback resistor, just a 330p cap. Or is it 4k7/100r? Seems a bit large @ times 47.
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Old 2nd June 2005, 01:10 PM   #7
rintek is offline rintek  Netherlands
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Default Simplest class B Amplifier

Simplest class B Amplifier Post #1
Anyone has a simple Class B Amplifier ?

http://www.angelfire.com/ab3/mjramp/amp7.html
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Old 2nd June 2005, 08:38 PM   #8
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Anyone has a simple Class B Amplifier ?

Here, they don't come any simpler than this. Here is part of the audio strip for a longwave receiver I designed and built awhile ago. Pay attention to the final that is connected to the active CW filter.

Works just great for this application. Of course, as for audio quality:

Then, again, high fidelity is neither needed nor desireable in this application.

Edit: Forgot a decimal point. The emitter resistors are 1.0/1.0W, not 10 ohms.
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Old 2nd June 2005, 11:15 PM   #9
Duo is offline Duo  Canada
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Lol, the PNP transistor in the push-pull output stage on that CW radio amplifier is in backwards.


By changing that amplifier to work with negative global feedback, it would be not bad.
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Old 3rd June 2005, 12:04 AM   #10
Duo is offline Duo  Canada
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Here's a design of great simplicity that I've used in a lot of projects when I needed a quick amplifier.

If you like, I can show you one with even more simplicity that uses three transistors, however, it's nowhere near as nice as the one I've shown here.

(NOTE) The input cap is 2.2F. I guess if you want a better low roloff you could put 22F lol.
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