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Old 22nd December 2008, 05:46 PM   #2411
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Click the image to open in full size.

Click the image to open in full size.

You may chuckle at some of things going on. It has been through a lot.
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Old 22nd December 2008, 06:49 PM   #2412
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Please excuse me Peter, but I have to ask Des O, where is your PSU?

All those pairs of wires should be twisted:- input pair, speaker pair, +-DC&PG to each PCB, the twin rectifier feeds. transformer primary feeds.

What is that switch? Mains rated????

Where is the Safety Earth connected?

How hot will the interior get due to the internal thermal blocks?
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Old 22nd December 2008, 07:08 PM   #2413
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You really think all those should be twisted?

Grey and brown are signal, going to a 5a switch. Blue and purple are ground going to neutral on the socket.

Red and black are one channel on the transformer

Yellow and orange are the other.

I could twist all the different transformer leads pretty easy I think.

I do not see the point of trying to make extra long leads for the V or PGs. None of them room with each other.

Incoming signal are not twisted because all they have is cotton over very pure copper.

There is an extra 1000uf BG STD under the rectifier board.

There is no earth ground connected anywhere. I find it does nothing but make a ton of noise everywhere I have tried it. My wall socket does not have it anyways, just the backstrap in the socket.

The only wires I feel I could twist are the output ones and I see no reason, there is no sound issues with them.

The blocks of aluminum never get too how to touch at any volume levels I can handle.
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Old 22nd December 2008, 07:16 PM   #2414
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by Destroyer OS.
3875 I decided to reduce some noise or something by switching to star grounding.

I soldered PG+, PG-, CG-Right, CG-Left, and with a 100ohm resistor in the path wire that connects to the chassis.

When I turn my amp on I have a tiny bit of noise which I am afraid is just from my transformer being so close to the rectifier board. Which reminds me anyone know anything to isolate this thing from that? I tried copper foil grounded to neutral but that just made the FM worse, did nothing for killing noise.................but it did nothing but kill their transformers noise.
and now you say

Quote:
You really think all those should be twisted?
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Old 22nd December 2008, 07:23 PM   #2415
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Ok I will twist all the transformer wires...

Everything else would make no sense to twist but the output ones, and they are a little short to worry about it.
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Old 22nd December 2008, 08:13 PM   #2416
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I twisted the two positive and two ground wires for the AC mains side of the transformer then twisted those two pairs together. I had to run an independent wire from the twist to the inlet socket for ground.

Then I twisted each channel together, but did not pair the channels. Should I do that? I still have noise, maybe less but... I still think the proximity of the transformer is hurting.
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Old 22nd December 2008, 09:34 PM   #2417
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I had transformers closer than that to the circuit, and there was no problem.

Basically, your setup does seem to have grounds done properly, you could twist the input signal wires, but I've built amps without twisting any wires and still they were qiet.

If it's a hum, it's usualy grounding problem, which again, seems to look fine here.

If it's radio frequency pick up, installing small caps as mentioned earlier should fix the problem.

BTW, I don't see any wires on your caps now?
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Old 23rd December 2008, 06:07 AM   #2418
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They were in the way for all the grounding. Plus they might of been fixing other problems.

After talking to some people it might of been a bigger effect of filtering via magnetic lines rather than grounding. They do it on some special Panasonic capacitors made for audio too. I was thinking I might try to make some really nice windings to slip over them later.

I would twist the input wires if they had any kind of real insulation other than copper that in a twist WOULD make them touch each other.

I might to ground the chassis better, it is a pretty weak ground. I think I can sand the paint off a bit where it the stand offs connect. Perhaps that will help.

The sound I have is more static.
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Old 23rd December 2008, 11:31 AM   #2419
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so that little green bit is earthing your enclosure...?

I'm pretty greenhorn, this looks odd to me. I religiously earth everything I do to a common 18guage solid copper rail attached to the earth on the mains lead (and the case), it's okay to just skip all that then?
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Old 23rd December 2008, 03:18 PM   #2420
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It doesn't seem like the "little green bit" is connected to anything, besides he already mentioned that his wall socket doesn't offer earth connection.

Religiously earthing everything is a good practice, some might say it's required by law so please continue doing that
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