LM4780 PCB

portreathbeach · 5th September 2011, 05:38 PM

Hi,

I have built a couple of amps and want to experiment with the LM4780 before I start my next amp. Instead of making my own PCB for the LM4780, like I did for my LM3875 amps, I thought I would just buy some pre made ones. I have emailed Peter Daniel, as he does a very nice LM4780 board, but it looks like it only comes with the PSU boads also.

I saw this on ebay: http://www.ebay.co.uk/itm/LM4780-hea...item2c5e079651

Has anyone used it, the layout doesn't seem too bad, apart from the feedback resistors are far from the chip. I could of course solder these directly to the chip.

Any thoughts?

! · 06:32 PM

The feedback resistors aren't that far away, right next to the chip at a right angle (the ones to the right of the PCB being for input)

There are also a couple auctions for the non-gold("en") plated version for about half the price.
LM4780 dual-channel POWER amplifier PCB | eBay

portreathbeach · 5th September 2011, 07:39 PM

My mistake! How stupid of me.

Unfortunately the link you posted isn't a 'Buy It Now'.

Has anyone made an amp with one of these boards, what do people think of them?

! · 6th September 2011, 12:49 AM

... well place a bid then

There's a website URL stamped onto the board, you might ask around in that site's forum.

KARLJHAN · 7th September 2011, 06:45 PM

Hi,portreathbeach
You can solder these directly to the chip and don't solder 0.18ohm resistor(feedback resistor must be less than 20k),It will have good results

portreathbeach · 7th September 2011, 09:51 PM

Just ordered a couple of boards from Peter Daniel at $10 each. Seems like a good price as they are gold plated and look to have a good layout. Also, I have read a lot of posts on this forum from Peter, and he seems to have a lot of knowledge in audio and seems well respected here on this forum.

jazko · 7th September 2011, 10:07 PM

I have an amp using the pcb from the ebay link. Runing at +-35v and it sounds decent, can't really say more. If you intend to listen it loud, be generous with the heatsink.

portreathbeach · 7th September 2011, 10:25 PM

As I've found with all chip amps, the heat sinks are very important. I am going to use a simple thermal trip attached to the heat sink that will operate the Mute function at a certain temperature.

5th September 2011, 05:38 PM	#1
portreathbeach diyAudio Member Join Date: Jan 2010 Location: Cornwall	LM4780 PCB Hi, I have built a couple of amps and want to experiment with the LM4780 before I start my next amp. Instead of making my own PCB for the LM4780, like I did for my LM3875 amps, I thought I would just buy some pre made ones. I have emailed Peter Daniel, as he does a very nice LM4780 board, but it looks like it only comes with the PSU boads also. I saw this on ebay: http://www.ebay.co.uk/itm/LM4780-hea...item2c5e079651 Has anyone used it, the layout doesn't seem too bad, apart from the feedback resistors are far from the chip. I could of course solder these directly to the chip. Any thoughts? __________________ Another project of mine: (a very big one at that!) http://www.mp3car.com/vbulletin/show...5-pimping.html

5th September 2011, 06:30 PM	#2
! diyAudio Member Join Date: Jun 2005 Location: Midwest	The feedback resistors aren't that far away, right next to the chip at a right angle (the ones to the right of the PCB being for input) There are also a couple auctions for the non-gold("en") plated version for about half the price. LM4780 dual-channel POWER amplifier PCB \| eBay Last edited by !; 5th September 2011 at 06:32 PM.

5th September 2011, 07:39 PM	#3
portreathbeach diyAudio Member Join Date: Jan 2010 Location: Cornwall	My mistake! How stupid of me. Unfortunately the link you posted isn't a 'Buy It Now'. Has anyone made an amp with one of these boards, what do people think of them? __________________ Another project of mine: (a very big one at that!) http://www.mp3car.com/vbulletin/show...5-pimping.html

7th September 2011, 09:51 PM	#6
portreathbeach diyAudio Member Join Date: Jan 2010 Location: Cornwall	Just ordered a couple of boards from Peter Daniel at $10 each. Seems like a good price as they are gold plated and look to have a good layout. Also, I have read a lot of posts on this forum from Peter, and he seems to have a lot of knowledge in audio and seems well respected here on this forum. __________________ Another project of mine: (a very big one at that!) http://www.mp3car.com/vbulletin/show...5-pimping.html

7th September 2011, 10:25 PM	#8
portreathbeach diyAudio Member Join Date: Jan 2010 Location: Cornwall	As I've found with all chip amps, the heat sinks are very important. I am going to use a simple thermal trip attached to the heat sink that will operate the Mute function at a certain temperature. __________________ Another project of mine: (a very big one at that!) http://www.mp3car.com/vbulletin/show...5-pimping.html


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6th September 2011, 12:49 AM	#4
! diyAudio Member Join Date: Jun 2005 Location: Midwest	... well place a bid then There's a website URL stamped onto the board, you might ask around in that site's forum.

7th September 2011, 06:45 PM	#5
KARLJHAN diyAudio Member Join Date: Nov 2010	Hi,portreathbeach You can solder these directly to the chip and don't solder 0.18ohm resistor(feedback resistor must be less than 20k),It will have good results

7th September 2011, 10:07 PM	#7
jazko diyAudio Member Join Date: Sep 2009 Location: Manchester	I have an amp using the pcb from the ebay link. Runing at +-35v and it sounds decent, can't really say more. If you intend to listen it loud, be generous with the heatsink.

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