Re: Level shifter inrush current

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gregory Hunter by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>

I use no inrush limiting resistors on my level-shifted
twin MOT supply, and I've had no problems with blown
diodes. Of course, MOTs are shunted, so the power
supply can only draw so much current at turn-on, and
no more, regardless of the load.

Cheers,

Greg
http://hot-streamer-dot-com.greg

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "J. B. Weazle McCreath by way of
> Terry Fritz <twftesla-at-qwest-dot-net>"
> <weazle-at-hurontel.on.ca>
> 
> 
> Hello Coilers,
> 
> Are those of you who are running twin MOT level
> shifter type supplies
> having any problems with inrush current at switch
> on?  Checking in my
> ARRL Handbook and other technical manuals, I'm
> finding recommendation
> to use some resistors in series with the diode
> strings to limit large
> inrush currents from blowing the diodes.  However,
> the supplies shown
> have much larger filter caps than what we are using,
> and perhaps that
> and the winding resistance of the MOT secondaries is
> enough to act as
> built in limiting.  Comments, suggestions....
> 
> 73, Weazle, VE3EAR/VE3WZL
> 
> Listening: 147.030+ and 442.075+
> E-mail:    weazle-at-hurontel.on.ca
>            or ve3ear-at-rac.ca
> Web site:  http://www.hurontel.on.ca/~weazle
> 
> 
> 


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