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/attachment.php?s=&postid=681376&stamp=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?
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/attachment.php?s=&postid=681376&stamp=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?
I split the secondarys like this:
An externally hosted image should be here but it was not working when we last tested it.
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:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=95451
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.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=95451
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.
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.
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.
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.
Dual trafos is clearly the way to go with these dual-mono kits.
Noticed sound improvements aswell.
An externally hosted image should be here but it was not working when we last tested it.
Fan isn't hooked up, don't know that I need it yet.
Used this as stargnd, and connected them to it and safety gnd to it aswell.
An externally hosted image should be here but it was not working when we last tested it.
Mayday said:Used this as stargnd, and connected them to it and safety gnd to it aswell.
An externally hosted image should be here but it was not working when we last tested it.
Mayday has got it to work without a disconnecting network.ianpengelly said: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.
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).
Andrew, that is how mine is effectively wired at the moment (from a grounding perspective), however, I am getting pops from my speakers when things like the fridge start. I am hoping that a disconnecting network will help to tame this, if not I'll be off out to get a filtered mains inlet.
2X22V for me.
I have just made the change over to two transformers and I am pleased to say no hum! And no pops and crackles last night despite not fitting my disconnecting network (ran out of time as Dr Who was on at 7:00, couldn't miss that!). So I am very pleased. I need to try it with music and see if there are any improvements made.
I have just made the change over to two transformers and I am pleased to say no hum! And no pops and crackles last night despite not fitting my disconnecting network (ran out of time as Dr Who was on at 7:00, couldn't miss that!). So I am very pleased. I need to try it with music and see if there are any improvements made.
The stargnd is simply a solder support(don't know if that's even a correct name, just translated straight from swedish), I bought it silverplated, then i connected the solderpoints together using 0,8mm(diameter) silverplated copperwire.
Normally I'd use 0,6mm(diameter) solid silver with teflontubing as insulator as internal wiring, but this build was my first chipamp, I wasn't shure about soundquality so I didn't want to spend too much.
Wires from boards to stargnd are 1,5 square mm pure copper. Also from stargnd to safety earth.
Normally I'd use 0,6mm(diameter) solid silver with teflontubing as insulator as internal wiring, but this build was my first chipamp, I wasn't shure about soundquality so I didn't want to spend too much.
Wires from boards to stargnd are 1,5 square mm pure copper. Also from stargnd to safety earth.
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