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 […]
Security and Protection
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 […]
Simple Crowbar Circuit
Simple Crowbar Circuit is safety part in electronics. It protect from high voltage spike or surge. Work like fuse but does not burns and it gets short circuit fast to stop damage. It use SCR or TRIAC for shorting, transistor or Zener to trigger. Trigger watch voltage all time. If voltage is too high then […]
Simple Over Voltage and Reverse Voltage Protection Circuit
Our device is safe from bad voltage by using this Simple Over Voltage and Reverse Voltage Protection Circuit. This circuit uses P channel MOSFET FQP47P06 which better than only diode. Simple diode can stop reverse voltage but not protect from overvoltage or surge. Here the MOSFET and Zener diode give protection. Circuit Working: Parts List: […]
Stop Dog Barking using IC 555 Circuit
Basic H-bridge PWM circuit uses IC 555 which helps to control dog barking and stop it. Main part is ultrasonic tweeter. It work with two IC 555 and four driver transistors. Circuit Working: Parts List: Category Description Quantity Resistor 1k 1/4 watt 1 Potentiometer 100k 1 Capacitor Ceramic 1nF 1 Semiconductors IC 555 2 Transistors […]
Stun Gun Circuit using IC 555
Stun Gun Circuit using IC 555 is simple electric device. It make high voltage for non-lethal self defense. Before making it we must know the danger and law rules to follow. Circuit Working: Parts List: Category Description Quantity Resistors 33k, 1k 1/4 watt 1 each Capacitors Ceramic 10nF, 100nF 1 each PPC 10nF 400V 8 […]