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Old 21st May 2007, 12:35 PM   #1
ebenai is offline ebenai  United States
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Default 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.
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Old 22nd May 2007, 05:48 PM   #2
DeanP is offline DeanP  Canada
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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...
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Old 22nd May 2007, 06:15 PM   #3
lgreen is offline lgreen  United States
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Default one is fine

Use just one rectifier board. It worked for me.
Retired from DIY (2010) but still lurking now and again. My DIY audio projects-
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Old 22nd May 2007, 08:32 PM   #4
ebenai is offline ebenai  United States
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Thank you very much guys. Will do.
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Old 25th May 2007, 11:49 AM   #5
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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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