We can charge supercapacitor safe and proper with and simple and easy to make Supercapacitor Charger Circuit. Battery does not charges or drain fast. Supercapacitor can do fast charge and drain. But supercapacitor hold less energy than battery. Circuit uses voltage regulator chip like LM317 to control voltage to supercapacitor. Regulator checks supercapacitor voltage and […]
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 […]
Simple Electronic Candle Circuit using LDR
This article for Simple Electronic Candle Circuit using LDR is fun and easy project to make fake candle with LED. It uses LDR to make LED flicker like real flame and turns ON when its dark. LDR controls the LED. In bright light the LDR has high resistance so LED stays OFF. And when its […]
Simple Motor Powered Emergency Flashlight Circuit
This is Simple Motor Powered Emergency Flashlight Circuit which is easy to make for emergency light. It uses motor like generator to make power. Power goes to LED for light and charges the supercapacitor. And then it turns motor to charge. Circuit Working: Parts List: Component Type Description Quantity Resistors 220Ω 1/4 watt 1 Semiconductors […]
Simple Darkness Detector Circuit
LED turn on by LDR when dark. LDR and resistor connect in voltage divider circuit. In bright light transistor base get low voltage so transistor stay OFF. When dark come LDR resistance goes down and base voltage goes up with transistor turn ON and LED light up. This Simple Darkness Detector Circuit is easy to […]
Motion Detector Circuit using IC 555
This easy Motion Detector Circuit uses IC 555 to find human from far. Circuit have two parts: Transmitter: IC 555 work like astable multivibrator and it make square wave signal. This signal goes out through IR sensor (infrared). Receiver: Phototransistor see IR beam. If someone moves and block the beam then phototransistor work and turn […]