[Amps] Power supply design considerations

[Dan]

Jim: Spark plug wire is excellent for the purpose and is easily available.
RG 213 class coax is also frequently used. Considering the safety aspects
you mention, I would use spark plug wire inside shield braid which is
grounded. The braid can be purchased from any of the wire suppliers or you
can remove it from coax. If you expect it to touch your leg, I would slip
the entire assembly inside spagetti tubing for a smooth surface.
  Re the cooling, I believe you will need a small blower or at a minimum,
air openings in the box for air circulation. Holes in the lower part of the
box for air entry and in the top of the box for hot air exit.
73, Dan, N5AR
----- Original Message -----
From: Jim Isbell <millenniumfalcon at cableone.net>
To: Mail list Amplifiers <amps at contesting.com>
Sent: Sunday, June 29, 2003 7:07 AM
Subject: [Amps] Power supply design considerations


> I am still working on the 4-1000A amplifier design and have decided to
> separate the PS from the RF chassis.  I still don't have my HV
> transformer but I am thinking that it will be too big to get into my
> presently designed cabinet of 14" x 14" x 12" dimensions along with the
> 4-1000A and all the plate tuning circuitry and filiment transformer.
>
> I will be putting the power supply under the bench in a built in (wood)
> cabinet that is already there.  The PS chassis/cabinet itself will be
> made of aluminum but it will set on a shelf inside a closed door so I am
> wondering about wheather I will have to wory about heat build up?  It
> will be solid state diodes, capacitors and transformer. Do I need to put
> in a fan in the side of the cabinet?
>
> The second item I am asking for design help on is the power cable to the
> RF chassis.  This will run about 6 feet from the under desk cabinet to
> the top of the desk through a hole in the bench.  It will be near my
> knees so I dont want it to arc (5 Kv) to any part of my body.....#8-)
> What should I use for transmission cable?  What is a source for such
cable?
>
>
>
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