[HomeBrew] HomeBrew Digest, Vol 77, Issue 3

[Henry Mei'l's]

Richard,

One safety measure in firing up an "iffy" device powered from the AC power 
line / Mains is to have a low wattage incandescent light bulb (e.g. 20 Watt 
rating)  in series with one leg --- worse that can happen is the bulb lights 
at full brilliance, if there's  a serious short in the circuit. If 
reduced-moderate illumination you can bypass the bulb; this is also a method 
for soft gear start-up. I most often do this when firing up a power-line 
device for the first time,  especially an older piece of gear, BUT first 
after ohming across the plug, as a passive check -- you usually know the 
aprox. DC resistance of a power transformer primary winding.

Henry, OZ1UF / N2NR

----- Original Message ----- 
From: <homebrew-request at mailman.qth.net>
To: <homebrew at mailman.qth.net>
Sent: Tuesday, December 14, 2010 6:01 PM
Subject: HomeBrew Digest, Vol 77, Issue 3


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> Today's Topics:
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>   1. Variac help (R. Blackman)
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> Message: 1
> Date: Mon, 13 Dec 2010 21:32:56 -0500
> From: "R. Blackman" <richard.blackman at sympatico.ca>
> Subject: [HomeBrew] Variac help
> To: "HOMEBREW" <homebrew at mailman.qth.net>
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> Thanks  for the helpful information on the use of the variac.
> I will add a fuse and power it up over the holidays.
> If all goes well, I will then apply it slowly to the old radio and see the
> results
>
> Many thanks
>
> Richard VA3NDO
>
>
>
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> End of HomeBrew Digest, Vol 77, Issue 3
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