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Old 25th March 2007, 03:56 PM   #1
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Default 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?
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Old 25th March 2007, 04:09 PM   #2
Mayday is offline Mayday  Sweden
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I split the secondarys like this:
Click the image to open in full size.
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Old 25th March 2007, 04:43 PM   #3
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Beautiful- Thanks!
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Old 27th March 2007, 07:34 PM   #4
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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.
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Old 27th March 2007, 08:32 PM   #5
Apex Jr is offline Apex Jr  United States
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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.
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Old 30th March 2007, 09:01 PM   #6
Mayday is offline Mayday  Sweden
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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.

Click the image to open in full size.
Fan isn't hooked up, don't know that I need it yet.
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Old 31st March 2007, 09:46 AM   #7
AndrewT is online now AndrewT  Scotland
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Hi,
no hum.
How did you connect the two audio grounds to the safety earth?
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Old 31st March 2007, 11:37 AM   #8
Mayday is offline Mayday  Sweden
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Used this as stargnd, and connected them to it and safety gnd to it aswell.

Click the image to open in full size.
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Old 1st April 2007, 07:33 AM   #9
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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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Old 1st April 2007, 07:42 AM   #10
AndrewT is online now AndrewT  Scotland
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Quote:
Originally posted by Mayday
Used this as stargnd, and connected them to it and safety gnd to it aswell.

Click the image to open in full size.

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).
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