Thanks to everyone for the information, especially the information on "direct
rectification" of the ac mains. I hadn't thought about the DC current being an
issue on the neutral side, is that really an issue, after all, the neutral is
really the same path as the ground. I really do want to have an isolation
transformer, so I will continue to look for ones that meet my needs. From the
limited web search I have done previously, it seems the transformer I need is
very expensive, more than just a few hundred dollars. As for a ramping
circuit, I didn't think of that either.
I have a pdf of my power supply schematic, I would definately welcome input on
it if anyone would be willing to look it over.
Basically, I'm attempting to repruduce this, but need a power supply
http://www.arrl.org/qex/2006/09/qx9ohsawa.pdf I guess that I could get 12v X
10 batteries, after all, that is how they did it in the old days!
Thanks,
Paul. (KG7HF)
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
Behalf Of kg7hf@comcast.net
Sent: Thursday, January 25, 2007 7:58 AM
To: amps@contesting.com
Subject: [Amps] power supply transformer
I am not sure I'm sending this correctly, but here goes.
I want to build a 120 volt DC source that can supply ~35 amps. I would like
to have the primary either 240 (typical) or 120 v AC. It doesn't have to be
regulated, but must be somewhat well filtered. My question is about
transformers, this type of transformer does not seem to be a common item.
Has anyone ever heard of a 240/120 primary 120 secondary at these high
current levels?
Why do I need to use a transformer in the first place, can I not simply
rectify and filter the two legs of the 240 without a transformer?
Thanks
Paul (KG7HF)
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