Bridged lm4780

rs1026 · 12th September 2004, 09:58 AM

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.

mandat · 12th September 2004, 10:10 AM

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.

tschrama · 12th September 2004, 10:49 AM

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

12th September 2004, 09:58 AM	#1
rs1026 diyAudio Member Join Date: Jul 2004 Location: Bangalore	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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12th September 2004, 10:10 AM	#2
mandat diyAudio Member Join Date: Oct 2003 Location: Gliwice	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.

12th September 2004, 10:49 AM	#3
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	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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