SB-610 Experience

[Kinney John-r17512]

How about putting the fuse on the primary side of the transformer?  All you need to know is the step up or down ratio, i.e. 120VAC to 600VAC is 5 times.  Ohms law says the power is the same on both sides (give or take a little), so if you are using 10 mA on the output at 600VAC then you are using 50 mA on the input at 120VAC.

I have in the past used an LED for a fuse.  In the AC circuit I used a Bi-Colored LED (two LEDs in parallel with opposite polarity) that had a maximum current capacity of 30 mA.  This worked very well for trouble shooting also as the intensity would change with current changes.  Certain light bulbs would work equally well, as someone else on this list has already mentioned.

73's
John KA7CVJ

-----Original Message-----
From: Mark Graalman WB8JKR [mailto:wb8jkr at JUNO.COM]
Sent: Thursday, July 31, 2003 2:02 PM
To: HEATH at LISTSERV.TEMPE.GOV
Subject: Re: SB-610 Experience


  I'm not sure but I would think the HV secondary may only
be rated at about 10 ma. or so and the smallest fuse I've
seen is about 100 ma. Anybody know what the secondary
can really tolerate current wise?

Mark  WB8JKR


On Thu, 31 Jul 2003 12:06:59 -0400 Peter A Markavage
<pmarkavage at JUNO.COM> writes:
> Has anyone considered a small low current fuse or a fusible link in
> series with one of the secondary high voltage leads. Given that
> exact
> replacement power transformers are not readily available and since
> the
> high voltage secondary winding can be under a lot of stress, due to
> component aging or leaky or possible shorting of the .15 mfd
> capacitors,
> some means should be provided to protect the HV secondary. I seem to
> recall running across computer monitors and some small portable TV's
> that
> used fuse links to protect their HV secondaries.
> Pete, WA2CWA
>
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