•  
  •  

Magnetic proximity sensors

Here is an interesting circuit for a magnetic proximity switch which can be used in various applications.
The magnetic proximity switch circuit, in principle, consists of a reed switch at its heart. When a magnet is brought in the vicinity of the sensor (reed switch), it operates and controls the rest of the switching circuit. In place of the reed switch, one may, as well, use a general-purpose electromagnetic reed relay (by making use of the reed switch contacts) as the sensor, if required. These tiny reed relays are easily available as they are widely used in telecom products. The reed switch or relay to be used with this circuit should be the ?normally open? type.
When a magnet is brought/placed in the vicinity of the sensor element for a moment, the contacts of the reed switch close to trigger timer IC1 wired in monostable mode. As a consequence its output at pin 3 goes high for a short duration and supplies clock to the clock input (pin 3) of IC2 (CD4013?dual
D-type flip-flop). LED D2 is used as a response indicator.
This CMOS IC2 consists of two independent flip-flops though here only one is used. Note that the flip-flop is wired in toggle mode with data input (pin 5) connected to the Q (pin 2) output. On receipt of clock pulse, the Q output changes from low to high state and due to this the relay driver transistor T1 gets forward-biased. As a result the relay RL1 is energised.

If there are any problems please contact webmaster@electronic-circuits-diagrams.com

Please share & like

Interacoustics Impedance Audiometer AT235
$1200.0  Interacoustics Impedance Audiometer AT235 picture
Agilent E2697A High Impedance Adapter w/ 10073 probe
$495.0 Agilent E2697A High Impedance Adapter w/ 10073 probe picture
Digital LCD Audio Impedance Test Meter Speaker Voice Resistor System Ohmmeter
$86.99 Digital LCD Audio Impedance Test Meter Speaker Voice Resistor System Ohmmeter picture
Fluke 845AB High Impedance Voltmeter Null Detector Voltage Resistance Bridges
$99.99 Fluke 845AB High Impedance Voltmeter Null Detector Voltage Resistance Bridges picture
Avo/Biddle 246003 E-Bite Battery Impedance Tester
$1995.0 Avo/Biddle 246003 E-Bite Battery Impedance Tester picture