Dark Detector Alarm Circuit Diagram using LDR and 555 Timer IC

Dark Detector Alarm Circuit Diagram using LDR and 555 Timer IC

A simple sensitive intruder alarm circuit diagram and schematic using NE 555 IC, 741 IC as comparator and an LDR.This is a good thief/theft alarm circuit for home.

A simple sensitive intruder alarm circuit diagram and schematic using NE 555 IC, 741 IC as comparator and an LDR.This is a good thief/theft alarm circuit for home.

ype pulse detector. The concept of the circuit is simple. With the alteration of the blood volume in the finger the contribution of the incident light on the LDR also changes. The alternation of the resistance causes an alternation of the voltage by a voltage divider (R1/LDR).

ype pulse detector. The concept of the circuit is simple. With the alteration of the blood volume in the finger the contribution of the incident light on the LDR also changes. The alternation of the resistance causes an alternation of the voltage by a voltage divider (R1/LDR).

http://www.electronicshub.org/electronic-eye-controlled-security-system/

Electronic Eye Controlled Security System Circuit using LDR

http://www.electronicshub.org/electronic-eye-controlled-security-system/

Image result for pir ldr circuit

Image result for pir ldr circuit

Image result for pir ldr circuit

Image result for pir ldr circuit

Pinterest
Search