Time-delay relay & proximity control


Posted on Aug 12, 2012

The design uses a proximity detector rather than a pushbutton switch to eliminate the need to mount and wire any equipment outdoors. The circuit worked well in this application and other applications.



The heart of the circuit is the quad CMOS NAND gate, IC1. A human hand near the sensor induces 60-Hz power-line noise into IC1A, and this IC triggers IC2. IC2 is configured as a monostable multivibrator, with a period equal to 1·1(R3+R4)(C3). The perio




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Infrared Remote-Control Tester Circuit
Phase Shifter With Eight Outputs Circuit
magic jack driver
NiCd Simple Smart Nicad Battery Charger circuit
LED DRIVER
A Cmos Based Motorcycle Alarm circuit
Crystals
A DC power supply boost circuit
TDA1510 Power Amplifier Applications 02



Top