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Old 12th September 2004, 09:58 AM   #1
rs1026 is offline rs1026  India
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Join Date: Jul 2004
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Default Bridged lm4780

Has anyone tried using lm4780 in bridged mode. I wanted to use that configuration for a sub woofer. Wanted a few inputs on how to go about designing the PCB for this configuration.I want to keep this a single layer PCB since its more "diyable"

I am using ExpressPcb
Please help! I am stuck here because I dont know how much space I should allow for the ic pins and how to position the parts.

Thanks.
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Old 12th September 2004, 10:10 AM   #2
mandat is offline mandat  Poland
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Join Date: Oct 2003
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Look at the thread http://diyaudio.com/forums/showthrea...threadid=35572
Pavel Dudek vel Upupa Epops has presented his amp based on LM4780 ICs. You can look at his very complicated but flexible PCB.
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Old 12th September 2004, 10:49 AM   #3
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I made a stereo bridged pair of LM4780 amps.. but I didn't use a PCB, I made it on vero board, .. it doesn't look very pretty, but it works just fine... it's allmost unbelieveble how cheap a stereo 240Watt amp can be made now... 2xlm4780, and couple of resistors... ... I used the circuit of the datasheet, I got less then 20mV offset and it sound pretty good.. It does get warmer though, you may gotta you a significant heatsink..

Goodluck,
Thijs
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