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

[J. Forster]

You have 24 VDC on the heaters.

-John

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> Now all I have to do is to figure out where to get the 18-75 VDC to drive
> it!  How well do ARC-5 and SCR-274-N receivers work on 96V?
>
> * * * * * * * * * * *
> * 73 - Mac, K2GKK/5 *
> * (Since 30 Nov 53) *
> * Oklahoma City, OK *
> * USAF, Ret (61-81) *
> * * * * * * * * * * *
>
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>> Date: Fri, 20 Dec 2013 16:29:14 -0800
>> From: jfor at quikus.com
>> To: arc5 at ix.netcom.com
>> CC: boatanchors at mailman.qth.net; arc5 at mailman.qth.net;
>> milsurplus at mailman.qth.net
>> Subject: Re: [Boatanchors] [Milsurplus] A Super-Easy 95 Volt B+ Supply
>> for	Your Projects.
>>
>> 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
>