Re: [CAD_CAM_EDM_DRO] fusing Gecko leads ( was Re: 2 Fried G210's in a single day :-(

Hi Lee,

You're correct, it's a safeguard, and you reminded me that I probably
picked it up in the late 60's, I was a bench tech while attending
college.

Alan KM6VV


studleylee wrote:

>
> Hi,
> Alan is suggesting this a safeguard until all is corrected. The
> current draw will be low if everything is ok, but if there is a
> short, the bulb will light and span (or bring) the supply voltage way
> down to keep the mosfets in the SOA(safe op area) region. The bulb
> will light up if you try to crank the G210's but thats ok, it just
> makes the supply spongy. This trick has been around for years on TV's
> and power amps during repair.
>
> btw,
> I used this tip( a 500w halogen shop lamp) for Inrush current
> limiting/testing on my home wound auto-transformer. Later I got some
> Megatherm NTC inrush limiters from the good people at www.amtherm.com
> (free samples)
> -Lee
>
> --- In CAD_CAM_EDM_DRO@y..., "Carol & Jerry Jankura"
> <jerry.jankura@s...> wrote:
> > Hi, Alan:
> >
> > Out of curiosity, if you had a couple of amps flowing through the
> lamp
> > filament to drive the motor, what would prevent the lamp from
> heating up and
> > increasing its resistance. I know that the cold filament resistance
> is
> > negligable compered to the motor's, but the warm to hot resistance
> is a
> > different matter.
> >
> > -- Jerry