briangt PSU 1 transformer, 2 PSU, how to?

sansbury · 25th March 2007, 03:56 PM

So I have the BrianGT dual mono kit, most recent iteration. There are two PSU/rectifier boards. I am assembling one channel first to verify things.

One question that comes up is that the first PSU board I have has terminals to connect 4 wires to off the transformer. I have a Avel trafo from parts express and am following this wiring diagram from another thread:

http://www.diyaudio.com/forums/attac...amp=1121283775

This shows all 4 secondary wires going into one PSU board. My question is, using one transformer, do I not use the second PSU board at all, or is there another way to wire this up?

Mayday · 25th March 2007, 04:09 PM

I split the secondarys like this:

sansbury · 25th March 2007, 04:43 PM

Beautiful- Thanks!

ianpengelly · 27th March 2007, 07:34 PM

The only problem I have found is that you might experience hum due to the two channels interacting through the transformer with this set up. I think the Dual Mono Brian GT kits are designed to be used with either 1 power supply board or 2 transformers. I wrote a thread about it:

Got Chipamp Hum? Possible Solution

Fingers crossed you don't run into this problem, but I did and it bugged me for ages until I figured it out. Now I am waiting to fit the second transformer.

Apex Jr · 27th March 2007, 08:32 PM

I had my webguy put a picture of hookup of the
toroids I have in stock on the website

www.apexjr.com/miscellaneous.html

1/2 way down
Thanks to Troy St Germain

Steve @ Apex Jr.

Mayday · 30th March 2007, 09:01 PM

Looks like this now, and no more humming either...it's completely quiet.
Dual trafos is clearly the way to go with these dual-mono kits.
Noticed sound improvements aswell.

Fan isn't hooked up, don't know that I need it yet.

AndrewT · 31st March 2007, 09:46 AM

Hi,
no hum.
How did you connect the two audio grounds to the safety earth?

Mayday · 31st March 2007, 11:37 AM

Used this as stargnd, and connected them to it and safety gnd to it aswell.

ianpengelly · 1st April 2007, 07:33 AM

Mayday,

Glad you had good results from moving to two transformers... I'll be off to the garage today to try and get mine modified.

Andrew,

I am ashamed to say I still haven't got round to building a disconnecting network.

AndrewT · 1st April 2007, 07:42 AM

Quote:

Originally posted by Mayday
Used this as stargnd, and connected them to it and safety gnd to it aswell.

Quote:

Originally posted by ianpengelly
Mayday,

Glad you had good results from moving to two transformers... I'll be off to the garage today to try and get mine modified.

Andrew,

I am ashamed to say I still haven't got round to building a disconnecting network.

Mayday has got it to work without a disconnecting network.
Look back to his amp photo and you can see his grounding wires going to the tag strip just above the CE label (right of centre).

25th March 2007, 03:56 PM	#1
sansbury diyAudio Member Join Date: Feb 2007 Location: Boston, Massachusetts	briangt PSU 1 transformer, 2 PSU, how to? So I have the BrianGT dual mono kit, most recent iteration. There are two PSU/rectifier boards. I am assembling one channel first to verify things. One question that comes up is that the first PSU board I have has terminals to connect 4 wires to off the transformer. I have a Avel trafo from parts express and am following this wiring diagram from another thread: http://www.diyaudio.com/forums/attac...amp=1121283775 This shows all 4 secondary wires going into one PSU board. My question is, using one transformer, do I not use the second PSU board at all, or is there another way to wire this up?

31st March 2007, 09:46 AM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, no hum. How did you connect the two audio grounds to the safety earth? __________________ regards Andrew T.

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25th March 2007, 04:09 PM	#2
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	I split the secondarys like this:

25th March 2007, 04:43 PM	#3
sansbury diyAudio Member Join Date: Feb 2007 Location: Boston, Massachusetts	Beautiful- Thanks!

27th March 2007, 07:34 PM	#4
ianpengelly diyAudio Member Join Date: Oct 2006	The only problem I have found is that you might experience hum due to the two channels interacting through the transformer with this set up. I think the Dual Mono Brian GT kits are designed to be used with either 1 power supply board or 2 transformers. I wrote a thread about it: Got Chipamp Hum? Possible Solution Fingers crossed you don't run into this problem, but I did and it bugged me for ages until I figured it out. Now I am waiting to fit the second transformer.

27th March 2007, 08:32 PM	#5
Apex Jr diyAudio Member Join Date: Jun 2002 Location: Torrance, Calif	I had my webguy put a picture of hookup of the toroids I have in stock on the website www.apexjr.com/miscellaneous.html 1/2 way down Thanks to Troy St Germain Steve @ Apex Jr.

30th March 2007, 09:01 PM	#6
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	Looks like this now, and no more humming either...it's completely quiet. Dual trafos is clearly the way to go with these dual-mono kits. Noticed sound improvements aswell. Fan isn't hooked up, don't know that I need it yet.

31st March 2007, 11:37 AM	#8
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	Used this as stargnd, and connected them to it and safety gnd to it aswell.

1st April 2007, 07:33 AM	#9
ianpengelly diyAudio Member Join Date: Oct 2006	Mayday, Glad you had good results from moving to two transformers... I'll be off to the garage today to try and get mine modified. Andrew, I am ashamed to say I still haven't got round to building a disconnecting network.

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