Could anyone please tell me if the proposed layout for my Quad 405 clone with dual mono power supply is OK.
My main concern is the 220v input and how far it should be away from the line inputs and circuit boards, and running under the rectifier board. The mains cable will be screened with a copper braid, which will be earthed..
The layout is to scale, and I would appreciate some helpful input whether this would be OK.
Thanks
Keith
My main concern is the 220v input and how far it should be away from the line inputs and circuit boards, and running under the rectifier board. The mains cable will be screened with a copper braid, which will be earthed..
The layout is to scale, and I would appreciate some helpful input whether this would be OK.
Thanks
Keith
Attachments
Not any help to use a screen on mains cable after all it is magnetic interference that may be the problem, Twist the live and neutral together, run them as far away as practical from input signal sources and that will suffice.
Is that the RCA connectors between the IEC input and the mains switch ?
That is really not a good idea.
That is really not a good idea.
Can the amplifier boards be mounted parallel to the heat sinks? They would be farther from
the power wiring. Maybe they could be moved a little closer to the front and use more of the
heat sink thermally. The RCA and speaker output should be near the back end of the sink.
Move the transformers close to the front panel, and keep all the power wiring close to
the bottom of the chassis. Twist all AC pairs.
the power wiring. Maybe they could be moved a little closer to the front and use more of the
heat sink thermally. The RCA and speaker output should be near the back end of the sink.
Move the transformers close to the front panel, and keep all the power wiring close to
the bottom of the chassis. Twist all AC pairs.
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Thanks for early replies
KatieandDad: The rca input sockets will be at the top of the chassis, the iec input and switch will be at the bottom of the chassis, sorry if my picture wasn't too clear.
JonSnell Electronic: Thanks for the input and the advice about the screening not working for AC mains.
rayma: Basically, I bought the wrong case but I have to live with it now. The only option that I could think about was a right angle piece of aluminium bolted to the heatsink on the board and this aluminium bolted to the heatsink,
Alternatively everyone, why not bring the mains cable into the chassis near the front of the case so that there is no mains running past the circuit boards. I've always thought that bringing the power in to the back of the chassis was a bad idea, something like propsed layout2.
KatieandDad: The rca input sockets will be at the top of the chassis, the iec input and switch will be at the bottom of the chassis, sorry if my picture wasn't too clear.
JonSnell Electronic: Thanks for the input and the advice about the screening not working for AC mains.
rayma: Basically, I bought the wrong case but I have to live with it now. The only option that I could think about was a right angle piece of aluminium bolted to the heatsink on the board and this aluminium bolted to the heatsink,
Alternatively everyone, why not bring the mains cable into the chassis near the front of the case so that there is no mains running past the circuit boards. I've always thought that bringing the power in to the back of the chassis was a bad idea, something like propsed layout2.
Attachments
In that case, move the transformers as far as possible toward the panel. Dress the transformer leads
toward the center and down the middle. Most of the EM field from the toroids comes from the area
where the leads exit, so turn those areas towards the center line or even the panel if long enough.
If necessary, the AC outlet and/or the line filter could be nearer the top of the panel to provide
clearance for the transformers. Or the soft start board and/or the line filter could be above the AC output.
Depends on how large the soft start board is.
toward the center and down the middle. Most of the EM field from the toroids comes from the area
where the leads exit, so turn those areas towards the center line or even the panel if long enough.
If necessary, the AC outlet and/or the line filter could be nearer the top of the panel to provide
clearance for the transformers. Or the soft start board and/or the line filter could be above the AC output.
Depends on how large the soft start board is.
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