Thanks David for your generous offer;
Where do they get the cores to make a compatible transformer that works in
the 576 circuit. This is not a 115v 60 Hz transformer.
A friend suggested a plate transformer and doublers or triplers. 225v is
also needed.
I have been looking at using a 4 kV and 225 V switching power supplies from
China and I have used some for other projects. They tend to be noisy but
can be cleaned up.
Since my 576 is still working there is no great urgency.
I also want to look at my friend's 577 and compare it to my 576. His is
smaller and lighter but may not do as much.
My 576 does weird things at lower currents (all loops) and PNP do not seem
to work the same as NPN (lack of steps) so the transformer is not the only
issue. I spent a couple of days working on it a few years ago but could not
improve it.
I need to find someone with a 576 and compare traces to see if mine is
"normal".
I need the 1500v capability which rules out some of the newer ones which
are also more expensive.
I will think about your offer.
Peter
On Fri, Aug 23, 2019 at 4:28 PM drawding@... <drawding@...>
wrote:
Yes. David Rawding is still here.
: )
I bought five professionally made transformers. One was donated to Bob
for his kind help. Two were used by me. Two were sold. I am all out.
Another run is ~ $1k for 5 more. Five is the minimum order. A bit
pricey, I know. However, they are made by a professional transformer
company. Fully enclosed and potted in silicone. If you consider what
technical wages are today and overhead and materials, I would say it is
fair pricing. However, at the hobby level, it is pricey.
If we can find five buyers (though this seems unlikely), I will handle
the details, and will sell at my cost + shipping.
Also, as you can see from this thread several people have been successful
winding their own.
One gentleman came here a year or so ago, asked a bunch of questions, got
great support from the group, ended up successfully winding his own, and
left. He was asked to put some details together (pictures, documentation,
video, etc), but apparently could not be bothered.
I hope you find a solution.
Thanks,
Dave
