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-   -   USB powered, MOSFET H-Bridge audio amplifier?!? (http://www.diyaudio.com/forums/pc-based/233061-usb-powered-mosfet-h-bridge-audio-amplifier.html)

merajsalek 29th March 2013 06:54 PM

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

blu_glo 4th April 2013 09:39 AM

1 Attachment(s)
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....

merajsalek 5th April 2013 05:12 PM

Quote:

Originally Posted by blu_glo (Post 3440454)
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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