Simple Missing Pulse Detector Circuit is an electric circuit. It finds when pulse is missing in pulse signal. Most time it uses 555 timer IC and work like monostable multivibrator. When it gets trigger it gives one output pulse. If next pulse does not come in time then timer is in no reset. Output pulse […]
Supercapacitor Charger Circuit
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 […]