USB powered, MOSFET H-Bridge audio amplifier?!? - diyAudio
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Old 29th March 2013, 06:54 PM   #1
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Cool USB powered, MOSFET H-Bridge audio amplifier?!?

Hi all

Not sure exactly which forum this should be in.....

I'm looking to build a USB powered, 2.5W amplifier...

PAM8403 based, and their brethren are not an option given the cost and the location of use (exchange rate, currency restrictions)

So I'm left with re-inventing the wheel

I came across this Give me a 5w or 10w amplifier circuit

Would this be a good idea to implement by itself, or would it require an opamp input buffer?!?

The thought of a MOSFET H-Bridge crossed my mind, but I lack the know how for pulling off such a design...

Would someone guide me in the right direction?!?

Thanks for reading

Cheers
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Old 4th April 2013, 09:39 AM   #2
blu_glo is offline blu_glo  England
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TDA7052 is an analogue bridged circuit based on the original circuit in your link. You will need 2 for stereo.
Using mosfets with limited supply is pointless and wasteful unless using a switching type amplifer....
Attached Files
File Type: pdf TDA7052.pdf (44.6 KB, 21 views)

Last edited by blu_glo; 4th April 2013 at 09:49 AM.
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Old 5th April 2013, 05:12 PM   #3
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Quote:
Originally Posted by blu_glo View Post
TDA7052 is an analogue bridged circuit based on the original circuit in your link. You will need 2 for stereo.
Using mosfets with limited supply is pointless and wasteful unless using a switching type amplifer....
Thanks for the pointer, mate!!

I was hoping to get around 2W.... I'll source TDA7052 and see how that works out.....

In the meantime, I think I'll build the H-Bridge just for the heck of it...
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