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Date: Fri, 27 Sep 96 12:57:56 EDT
From: John 015 <CC015012@BR*.br*.ed*>
Subject: Re: Building My Own Dive Light??????
To: techdiver@terra.net

Hi,


  I've got a couple of e-mails regarding showing a workable
solution for a reed-based on/off switch.  I do not use the
circuit below and I have never tested it but it's the most
basic,  minimalistic and totally workable solution I know of.

It's also easy to make it very fault tolerant using redundant
parts.

                                POS BATTERY TERM.
                                      I
           +--------------------------+
           I                          I
           I                          I
          reed                      LAMP
           I                          I
           I                          I
           I                        D-+      N-channel
           +---------1k0-----------G         MOSFET(s)
           I                        S-+
           I                          I
          10k                         I
           I                          I
           +--------------------------+
                                      I
                                   ground (minus)



A coat of Konformal SR2000 and this thing can take a
flooding at 600 feet with ease.

Disclaimer:  Experiment and use at your own risk.
And whatever you do never dive rectangular battery housings.


Regards,
John

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