[ARC5] [Milsurplus] A Super-Easy 95 Volt B+ Supply for Your Projects.

[J. Forster]

It looks like an interesting part.

How much EMI does it put out? I'd guess it's pretty noisy.

Also, it looks to be an end-of-life part. I've been burnt by those in the
past. They can easily become unobtanium, or very expensive.

My inclination has always been to use relatively low frequencies (<5kHz)
in switchers. Yes, it does make them somewhat bigger and heavier, but the
EMI is much reduced, since you can use longer switching times.

FWIW,

-John

=================



> As ya'll know, I've had good luck working with monolythic
> DC/DC converters for powering projects.
> Many of them aren't useful for us, having outputs like 5V etc.,
>  but there is a current listing that will fit many projects.
> I bought a couple for testing.
> They were quiet inexpensive- $8 each.
>
> http://www.ebay.com/itm/160775207820
>
> A spec sheet is at:
>
> www.murata-ps.com/data/power/bwr15-20wa-series.pdf
>
> While the converters are speced for 18 to 75 volts DC in
> to produce an isolated-from-the-input dual output of + and - 48 Volts,
> I've tested these down to 10 Volts in and they still worked fine.
> The two output supplies have a common "ground."  By leaving this "common"
> open and connecting the + output as B+ and the - output to ground
> (12 volt input common),
> I have a 95 VDC B+ supply from 12 or 24 Volts in.
> I tested it by powering-up a "hammed" BC-454 receiver.
> It worked well but does have some low-amplitude""birdies"
> on the output.  I did not do any RF filtering during the tests.
> I have filtered other DC/DC converters like this with ferrites and
> that took care of the birdies.  Smarter people than me will have
> ideas on this.
> I'm ordering some more.  Very useful.
>
> 73 DE Dave AB5S
>
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