N\C Magnetic switch
N\C Magnetic switch
(OP)
Good day All,
I am looking for a normally closed magnetic switch that is both very small and will turn on the circuit when the magnet is removed the whole assembly must be watertight. Any suggestions or other ideas will be helpful.
I am looking for a normally closed magnetic switch that is both very small and will turn on the circuit when the magnet is removed the whole assembly must be watertight. Any suggestions or other ideas will be helpful.





RE: N\C Magnetic switch
"N/C (NORMALLY CLOSED CIRCUIT WHEN MAGNET IS NEXT TO IT)"
This is Alarm System nomenclaturism.
Many years ago, Radio Shack sold both types of reed switches. The majority were the type that closed the contacts when the magnet was nearby (I'd call them NO), but they also sold the reed switches that opened the contacts when the magnet was brought nearby (I'd call them NC).
RE: N\C Magnetic switch
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regards
Pete
RE: N\C Magnetic switch
Keith Cress
Flamin Systems, Inc.- <http://www.flaminsystems.com>
RE: N\C Magnetic switch
Dollar Stores (bless 'em) sells cute little alarms that have a built-in magnet reed switch, some button cell batteries, a slide swicth, and a piezo alarm. The gadget comes with the complete package including the magnet and batteries ARE included.
Cdn$1.00 each (about US$0.85).
Point being - since the alarm sounds when the magnet goes away, I suspect that they're probably using a N/C reed switch (contacts closed when the magnet goes away). It's less likely that they're using any circuitry to invert a oh-so-very-slightly cheaper N/O reed switch.
If you're making a prototype or other one-off, check the Dollar Stores.
RE: N\C Magnetic switch
Is that a dollar store Canadian or
an 85 cents store U.S.?
RE: N\C Magnetic switch
RE: N\C Magnetic switch
RE: N\C Magnetic switch
RE: N\C Magnetic switch
I assume you are using this as some kind of power or activation switch. I have seen products with a micro that remains in sleep if a reed switch is closed (magnet present) and actives when the contacts are open (magnet removed). The proper micro will only require a few microamps in sleep.
RE: N\C Magnetic switch