SWITCH_CLOSURE_CIRCUIT

Published:2009/6/18 3:58:00 Author:May | From:SeekIC

A standard proximity detector circuit for the Cherry Semiconductor CS209 IC can detect an iso-lated switch closure by adding a few tums of wire around the circuit's inductor (Radio Shack 273-102). Moreover, the technique doesn't require any isolated power (see the figure). With the switch open, the potentiometer P1 is adjusted until the output switches off. When the switch is closed, the Q of the circuit changes and the output turns on. Capacitor C1 should be silvered mica, and poten-tiometer P1 should be a multiturn type such as the Boums 3006P-1-203. A 9-V supply can be used for Vcc.



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