Need some help: one vs. two rectifier boards?

ebenai · 21st May 2007, 12:35 PM

I'm assembling Peter Daniel's LM4780 kit. It comes with two rectifier boards, but I only have one transformer. I read a post in which only one board was used for the LM 3875. Can I use only one? The only way I could do it would be to connect two wires to each one of the V+, PG+, V-, PG-. The LM3875 rectifier has 2 connections for each one. The LM4780 has only one. Appreciate some advice.

DeanP · 22nd May 2007, 05:48 PM

Use only one power board as you'll end up getting a ground feed loop.(name?) I tried two power boards with one tranny and I get the buzzing. I'm in the middle of rebuilding and plan on using only one power board per tranny.
There is a thread here on just this and what was done to get rid on the buzzing.

edit: here is the thread Let there be music :) ...and Hum :(

lgreen · 22nd May 2007, 06:15 PM

Use just one rectifier board. It worked for me.

ebenai · 22nd May 2007, 08:32 PM

Thank you very much guys. Will do.

ianpengelly · 25th May 2007, 11:49 AM

This is worth a read:

Got Chipamp Hum? Possible Solution

I have now moved to two transformers, which you can do at a later date as a upgrade.

Good luck.

21st May 2007, 12:35 PM	#1
ebenai diyAudio Member Join Date: Jul 2006	Need some help: one vs. two rectifier boards? I'm assembling Peter Daniel's LM4780 kit. It comes with two rectifier boards, but I only have one transformer. I read a post in which only one board was used for the LM 3875. Can I use only one? The only way I could do it would be to connect two wires to each one of the V+, PG+, V-, PG-. The LM3875 rectifier has 2 connections for each one. The LM4780 has only one. Appreciate some advice.

22nd May 2007, 05:48 PM	#2
DeanP diyAudio Member Join Date: May 2004 Location: Cold Lake	Use only one power board as you'll end up getting a ground feed loop.(name?) I tried two power boards with one tranny and I get the buzzing. I'm in the middle of rebuilding and plan on using only one power board per tranny. There is a thread here on just this and what was done to get rid on the buzzing. edit: here is the thread Let there be music :) ...and Hum :( __________________ Yes! Its cold in Cold Lake...

22nd May 2007, 06:15 PM	#3
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	one is fine Use just one rectifier board. It worked for me. __________________ My DIY audio projects- PartTimeProjects.com.

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22nd May 2007, 08:32 PM	#4
ebenai diyAudio Member Join Date: Jul 2006	Thank you very much guys. Will do.

25th May 2007, 11:49 AM	#5
ianpengelly diyAudio Member Join Date: Oct 2006	This is worth a read: Got Chipamp Hum? Possible Solution I have now moved to two transformers, which you can do at a later date as a upgrade. Good luck.

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