[Milsurplus] More on that +/- 48 Volt DC-DC Converter

[B. Smith]

I've had pretty good luck with several of the mini inverters on ePay and 
from
Murphy's Surplus. Often a simple rewinding of the main transformer coil 
will provide you with a high voltage, low current supply for B plus 
purposes.  And yes you will experience some birdies at the higher 
frequencies caused by the frequency of the switcher.  Very very hard to 
filter out.
http://k4che.com/FT.%20Miles%202012/Pg%204%20photos/zenith%20battery.AVI

On 12/22/2013 12:58 PM, David Stinson wrote:
> A few people asked so here's a photo of the little "brick"
> supplying +97 VDC to the ham-verted BC-454.
> Works excellent and plenty of audio.
> Here's a photo of it just "tacked" onto the back deck
> of the receiver on my cluttered work bench:
> http://home.netcom.com/~arc5/dcdcpwr.jpg
>
> The receiver works entirely on 12 VDC.
> Even powered it from a Gel Cell for awhile.
> Since there is no filtering, there are birdies at each harmonic of the 
> switching freq- about 160 KC.
> None of them have been a problem so far and a pot
> on the "trim" input would likely move any birdie if it
> was an issue.
> 73 DE Dave AB5S
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>