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



--- In dmcnews@xxxxxxxxxxxxxxx, Joe Angell <jangell@...> wrote:

A DPST relay would work because it is open circiut (with a form B 
switch) when the door is closed, and therefore does not draw any 
current. When the door opens, the switch will activate the relay and 
switch both circuits at the same time. But the key is that it has to 
be a switch that is open when door is closed. 
I have a schematic of the whole ciricut that I will try to post when 
I dig it up. 

Tom



> >   Very nice write-up! It is nice to have someone take the time to
> > present such a detailed description.
> 
> Thanks
> 
> >   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).
> 
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