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

[Peter Gottlieb]

That one is a special, it's not on the data sheet, but no way it can source 6 
amps; it's a 20 watt converter, at 96 volts do the math. And think of what the 
input current would be, it would burn off the leads at the low input voltage.


On 12/20/2013 4:29 PM, J. Forster wrote:
> 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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>
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