Is this light bulbe system effective?, because at first bulbe's filament
exhibits a very low resistance, increasing then as it gets hot. At least for a
very short time, I figure this will allow a high current peak initially.
Best regards
Guillermo - LU8EYW.
Dan Fitch escribió:
> A simple solution for inrush limiting was shown in a project amplifier in
> the 65' ARRL handbook. It was simply a 60W standard light bulb placed in
> series with the primary (I imagine two in series would be fine for 240). A
> few seconds after turn-on, the light dims out as the capacitors charge and
> the operator just flips a toggle switch that bypasses the lamp(s). Would
> cost just a few dollars at most, even if a separate box were needed. It
> could be automated with a time-delay relay too, I suppose.
>
> 73' de Dan, KB4L
>
> -----Original Message-----
> From: amps-admin@contesting.com [mailto:amps-admin@contesting.com]On Behalf
> Of Wo2e@aol.com
> Sent: Wednesday, October 30, 2002 10:27 AM
> To: amps@contesting.com
> Subject: [Amps] Re: Amps digest, Vol 1 #357 - 15 msgs/INRUSH CURRENT
> PROTECTION
>
> Dear: cam wa4jrw,
> i have an amp (ampsupply lk-500) that was blowing the caps and the string of
> diodes, at start up. just the same problem you have, the inrush current was
> too much at times for the caps. and at almost 10 dollars each they are not
> cheap if i have to replace them 2 to 3 times a year. i resolve my problem
> with a big heavy duty variac bringing the voltage slowly to 4000 volts max.
> i
> had no problem ever since also is this is your case ameritron sells an
> external in rush current protector about $80 give or take. older amps don't
> have the inrush current protection like the newer ones. maybe somebody else
> might have a better idea. good luck. Pete WO2E.
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