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Date: Sun, 10 Sep 2000 15:42:57 -0400
From: Klaus and Debbie Boehmke <dboehmke@be*.ne*>
To: Jeff Disler <pdisler@io*.ne*>
CC: techdiver@aquanaut.com
Subject: Re: Tech question
Jeff

Thanks for the info but I was aware of all that. My concern is the possible
failure of the boot. Sounds like the latching relay and a reed switch could be
an alternate way to go.Is the boot leak a legitimate concern and has anyone
ever had this problem.

Klaus


Jeff Disler wrote:

> At 10:45 AM 09/09/2000 -0400, Klaus and Debbie Boehmke wrote:
>
> >> Hi all,
> >>
> >> After close examination and disassembly of my Pro 6 lite, I have come to
> >> the conclusion that the only thing between a working lite and a flooded
> >> lite, is a thin rubber membrane over the on/off toggle switch.  Why is
> >> this
> >> more desireable over a reed magnetic switch such as those used on DPVs?
>
> A reed switch is not designed to carry large current loads. Some of the
> reed switches (like the ones use in scooters and electronics) will however
> carry enough current to actuate the coil in a 12 volt relay made by any
> number of manufactuers.
> The relay used also must be capable of handling the current that the
> selected bulb draws.
> You could build the light this way, as long as the above conditions were
> met, however, it would cause an increased amperage drain (as the relay must
> have a constant current flow to hold the coil) on the entire system.
> This of course would decrease the burn time of the light, as well as reduce
> the voltage the bulb sees, thus making the light output somewhat less.
>
> Hella manufactuers a solid state relay that enviromentally sealed and only
> draws a few mah.
> Also a latching relay would work. It takes a voltage pulse to close the
> relay (completing the current path) and another to open the relay (closing
> or breaking the current path). Latching relays do take a small amout of
> current to operate but the interval is very brief(a few milliseconds). They
> only draw current when the pulse is recieved they by making them the choice
> for applications where the need to keep the voltage drain to a minumim is
> desired.
>
> A switch on the other hand, has only a very small amount of resistance and
> is the less expensive method of curcuit completion for said purpose.
> Because of its simplicity, it is less prone to failure.
> Rubber boots come in varying thickness, I'd say that might be the direction
> to the solution.
>
> Regards JD
>
> "SILT HAPPENS"JD   JEFF DISLER
>   SAFE CAVING       NSS 26000



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