proximity switch

Thread Starter

sify87

Joined Jun 23, 2010
9
Can u plz help how a NPN or PNP transistors is used in proximity switches?
 

hgmjr

Joined Jan 28, 2005
9,029
Are you wanting to implement a proximity switch or are you looking to implement a touch switch?

A touch switch can be built with a single MOSFET. A proximity switch is bit more involved.

hgmjr
 

retched

Joined Dec 5, 2009
5,197
Are you thinking of HALL effect sensors? They often look like NPN and/or PNP transistors and can be used for proximity sensors/switches



And some even more so.
 

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Jaguarjoe

Joined Apr 7, 2010
767
Industrial prox switches are referred to as NPN or PNP depending on how the output is configured. An NPN prox is a low side switch, a PNP is a high side switch.
 
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