Re: Low Voltage Cutoff Circuit

From: Me (me_at_me.me)
Date: 08/27/04 

Date: Fri, 27 Aug 2004 19:25:56 GMT

"John Fields" <jfields@austininstruments.com> wrote in message
news:t5vui0tt3mvlccika9ookvd6kn7bbrr6nh@4ax.com...
> On Fri, 27 Aug 2004 16:17:59 GMT, "Me" <me@me.me> wrote:
>
> >
> >"Fred Bloggs" <nospam@nospam.com> wrote in message
> >news:412E9C78.4010403@nospam.com...
> >>
> >>
> >> John Fields wrote:
> >> > On Thu, 26 Aug 2004 04:29:41 GMT, "Me" <me@me.me> wrote:
> >> >
> >> >
> >> >
> >> >>Thanks for the replies.
> >> >>
> >> >>Here's what I was thinking. An SCR connected in series with the
Ballast.
> >> >
> >> >
> >> > ...
> >> >
> >> > ---
> >> > Sounds like a good idea. Just for grins, how much current does your
> >> > ballast draw when it's running? Does it draw any current when its
> >> > internal low-voltage cutoff is active?
> >> >
> >>
> >> good question- assuming that ballast cut-off current does fall below
the
> >> SCR holding current, the simplest ckt would use a momentary ON-OFF-ON
> >> rocker switch- these are available in surplus:
> >>
> >> View in a fixed-width font such as Courier.
> >>
> >>
> >>
> >>
> >> rocker sw
> >> +--------+
> >> | o--|-------------+
> >> | | |
> >> +-|-o---> | |
> >> | | | |
> >> | | o | |
> >> | | | | |
> >> | +--------+ |
> >> | | SCR |
> >> | | |
> >> Vbatt>---+-------------------|>|--+-> Load
> >> | /
> >> | 100 |
> >> +---/\/\----+
> >>
> >
> >The problem is, I have to use an existing switch, Momentary with lock on.
>
> ---
> I'm getting kind of confused here...
>
> The switch that you're stuck with, is that a switch that came with the
> ballast and is in series with the supply? That is, when it's ON does
> it have to pass all the current the ballast needs?
>
> --
> John Fields

Actually, the switch is part of the light that I'm putting the Ballast in.

Relevant Pages

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