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DTMF Proximity Detector:
Dual Comparator: forms temperature-compensated proximity Detector
Dual Comparators Stabilize Proximity Detector: 02/16/98 EDN-Design Ideas
Magnetic Proximity Switch:
Optical Proximity Detector: A "reflector" isolator (A) detects the presence of an object by bouncing light off of it. This technique is useful in circuits that detect when an object is close enough to the sensor (B).
Proximity Alarm #2:
Proximity Alarm #3:
RS232C Link Monitors Animal Activity: 11/06/97 EDN-Design Ideas
