[DML] Re: DIY Door Light Switch Upgrade: Magnetic Switches

["neiland14" <tneiland@xxxxxxxxxxx>]

Joe, 
  Very nice write-up! It is nice to have someone take the time to
present such a detailed description. 
  If I may add a few thoughts. The "proximity switches" come in 3
types, the most common is "form A" which is closed circiut in the
presence of a magnet (and most common because they are used in alarm
systems). Then there is "form B" that is open ciruit in the presence
of a magnet (good for door switchs since they draw no current when the
door is closed). "Form C" has both open an closed circuits (3-wire SPDT). 
  I built a similar circuit for my car and wanted to share a few
things I learned. With normal bulbs, the D's door lights pull about 1
AMP each side. It is abut 1/10 that or 100 mA with LEDs. The typical
magnetic switchs is rated for 500 mA for form A and 250 mA for form B.
So, it is probably good that you used the transistor. I used the form
B switch with a relay so I could do the function of both of the
driver's side switches with one magnetic switch. The down-side of the
relay is that you have to wire it to a power source under the dash
(only used when the door is open). It would have probably been simpler
to use a transistor like you!
 I too, really like the results. I never have to worry about the
switch alignment again. There is no contact between the magnet and the
switch. 
  Again, I appreciate the write-up.

tom
   



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