Simple Dark Sensor Circuit for Security using IC 555 timer is useful project for security. It senses low light and turns ON the buzzer or light. It is used for LDR as light sensing. Circuit is good for night light and alert system. The circuit have parts like 555 IC, LDR, resistors, capacitor and buzzer […]
Security and Protection
Simple 555 Timer Based Animal Repeller Circuit
Simple 555 Timer Based Animal Repeller Circuit is small device to keep animals away. It make high sound which animals do not like and humans mostly do not hear it. Main part is IC 555 timer which make high frequency sound. Sound is around 15 kHz to 120 kHz (ultrasonic). This circuit is easy to […]
Build Our Own Solder Fume Extractor Circuit
Soldering make bad smoke which is not good for health. So every work table need good smoke remover. To Build Our Own Solder Fume Extractor Circuit uses few easy parts to remove bad smoke. It uses BC547 transistor, small DC fan, preset resistor, capacitor and NTC thermistor to make air clean and safe. NTC thermistor […]
Build Your Own Door Knob Touch Alarm Circuit
Todays time safety is very important. This Build Your Own Door Knob Touch Alarm Circuit can help protect home and office. This small project is Door Knob Touch Alarm using 555 IC. It can sense when someone touches the door knob. If someone touches then alarm makes loud sound. It scares intruder and warn owner […]
Digital Code Lock Circuit using Arduino
Security is important everywhere in world and is more hard in secret places. This project for Digital Code Lock Circuit using Arduino help make better security. It use Arduino, small computer to make simple lock. With Arduino UNO, keypad, buzzer, LCD (16×2), BC547 transistor and resistors it show how digital code lock work. User must […]
Thyristor Switching using Snubber Circuit
This article we talk about Thyristor Switching using Snubber Circuit. It is like switch which is used in power electronics for high voltage and current. Thyristor also called SCR (Silicon Controlled Rectifier). It turns ON by gate signal and to turn it OFF the current must stop. But when turning ON and OFF the voltage […]