IC 555 Timer Based Vibration Alarm Circuit is any easy to make. It senses vibration and gives sound and light alert. This circuit is used in security systems, factory machines and anti-theft devices. Main part is IC 555 timer which sends steady signal when sensor feels vibration. Circuit Working: Parts List: Component Specification Quantity Resistors […]
Alarm Circuits
Easy DIY Timer Alarm Circuit with 555 IC
IC 555 is very popular and useful chip in electronics. It works in different modes with bistable, astable and monostable. Here we used IC 555 in monostable mode to make a Easy DIY Timer Alarm Circuit with 555 IC. We can set time and after that the buzzer or alarm will ring. It is nice […]
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 […]
Fire Alarm Circuit using Thermistor and IC 555
In fire time, the Fire Alarm Circuit using Thermistor and IC 555 help to find and warn people. This design uses IC 555 and thermistor to check temperature change and maybe fire. Thermistor is special part which feels the temperature change. Circuit is easy to make and thermistor changes resistance with heat. If hot then […]
Panic Alarm Button Circuit using IC 555
Make cheap and easy Panic Alarm Button Circuit using IC 555. IC 555 work like bistable circuit with two states: alarm ON and alarm OFF. Press panic button, timer start and stay ON until reset button is pressed. Timer give high output, turns ON transistor and then LED light and buzzer makes sound. Circuit Working: […]
Mains AC Power Supply Failure Buzzer(Alarm) Circuit
Mains AC Power Supply Failure Buzzer(Alarm) Circuit is small device. It makes sound (buzzer) when AC power goes OFF. It helps us to know power gone and is useful if we have important machine to know power goes at night. It uses one switch called relay. When power is there the relay works and stops […]