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Old 6th March 2012, 09:52 AM   #111
AndrewT is offline AndrewT  Scotland
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I see 8 secondary tappings coming from each transformer.

Are these transformers, quad secondaries? I.e. all channels are isolated from each other.

If these are dual secondary transformers then the two channels supplied by each transformer are not isolated. A dual transformer feeding two PSUs and two amplifier creates a potentially enormous loop in the grounding wiring. Three dual sec transformers could have three big loops.

The two channels of amplification must be laid out (adjacent or on top of each other) to minimise the loop area.
Even doing this will not eliminate the hum at the output. This hum will vary with the various interconnections you adopt.

A monoblock is much easier to build hum free. A stereo is difficult to get hum free.
A 6channel is a challenge I will never rise to.
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Old 6th March 2012, 12:46 PM   #112
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Good Question.

a) 1 channel, shorted input = no buzz
b) 1 channel, dsp input = no buzz + small hiss
c) 2 channel, shorted input = buzz
d) 2 channel, dsp input = buzz + small hiss

The hiss when connecting the dsp is very low level and requires my ear right next the the tweeter.

More importantly the buzz starts as soon as two channels are connected to the same transformer.
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Old 6th March 2012, 12:57 PM   #113
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Posted just before I saw your post Andrew.

Here is a new drawing showing the Antek AS-4222 Dual Secondary Trany.
Each PSU/AMP board is simply paralleled with the other.

With only 1 transformer turned on would this not act like a simple stereo amp?

Should I be using only 1 PSU board with two AMP boards?

Cheers
Dean
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Old 6th March 2012, 01:00 PM   #114
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Oops, forgot this...
Attached Images
File Type: jpg 6 Channel LM Amp Schematic v5.jpg (203.6 KB, 60 views)
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Old 6th March 2012, 01:03 PM   #115
AndrewT is offline AndrewT  Scotland
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I have not found any way to get 2channel hum free operation using dual PSUs from a dual secondary transformer.

Either quad secondaries or single PSU in a two channel amplifier is the only recommendation I can give.

If anyone can give better advice then please do shout out.

I need the answer.
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Old 6th March 2012, 01:13 PM   #116
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Its nice to hear you still get challenged by this bobby too Andrew.

I definitely considered 6 mono-blocks but the cost was way too high, my f5 build will be but with only 2 its much more probable.

Peter Daniel suggested turning the gain down. Just looking for his post now. Is this an option and would anybody suggest how to try it?
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Old 6th March 2012, 01:16 PM   #117
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Right, I'm with Andrew then. You need to have each pair of amps running from one PSU. Turning the gain down isn't really a sensible option in my opinion.
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Old 6th March 2012, 01:16 PM   #118
AndrewT is offline AndrewT  Scotland
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I am constantly challenged by this hobby.
I am not afraid to admit I only know a tiny fraction of the subject.
This Forum allows me to continue learning at the slow pace that suits me.
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Old 6th March 2012, 01:33 PM   #119
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Hope Peter reads this.

I wonder if 1 PSU is capable of running 2 AMP modules??
I will start collecting the component specs and post back.

Cheers for the input gents.
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Old 6th March 2012, 01:37 PM   #120
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Should be. You could try just bypassing the rectifiers on one PSU board with DC taken from the other.
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