Aleph-2 PSU wiring layout question - diyAudio
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Old 21st August 2003, 01:20 AM   #1
moe29 is offline moe29  United States
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Default Aleph-2 PSU wiring layout question

Is this a bad layout for my Aleph 2 power supply? I'm questioning
running the AC connection wires for the transformer between the
capacitors. I would run the wires along the floor of the amp and
then up to the AC inlet. For some reason i have a gut feeling that
this isn't such a good layout. It is convenient though because
that is the back panel of the amp. The fuse and switch would be
along side the AC inlet. Thanks for any input
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Old 21st August 2003, 09:56 AM   #2
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moe,

I donīt think itīs a problem to do it this way. Try to twirl the two wires for min. radiation.
Maybe you could even use shielded wire or make up a shield by cutting up some coax cable or use a small piece of iron tube.

In my Aleph the 230V also runs alongside the caps of one channel (couldnīt do it any other way) and I never noticed or measured any difference in hum /noise of both channels.

william
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Old 21st August 2003, 06:57 PM   #3
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Moe,

If you are concerned about induced hum radiation, air space is a great shield..says Doug Self.

In Self's articles and book he gives a good account of wiring practice for power amps. It is not nearly as critical for Class A as it is for Class B. I recall the ac wiring to and from the transformer should be twisted, but kept seperate from the earth (o volt) wiring and well clear of any signal wiring or boards.

More interesting is the so called star earth and feeback return points to minimise distortion.

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Old 21st August 2003, 07:26 PM   #4
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The truth is that the transformer itself is a much larger
contributor to magnetically radiated noise, and routing of
AC wiring is pretty non critical by comparison.

Just keep all of this as far away from the input stage as
you can.
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Old 21st August 2003, 07:34 PM   #5
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There you have it Moe,

The One and Only is watching over us.

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Old 21st August 2003, 09:42 PM   #6
moe29 is offline moe29  United States
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Thanks Guys! I guess it is kind of funny to be worried about
a couple of wires when the transformer is sitting right there!
I just hadn't read much about how to run the wire connections.
Then again, i guess nothing beats wiring it all up and see how
it sounds. I will keep everyone posted

moe29
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