Mains AC Power Supply Failure Buzzer(Alarm) Circuit is small device; it makes sound (buzzer) when AC power goes OFF. Furthermore, it helps us to know power gone and is useful if we have important machine to know power goes at night; also it uses one switch called relay. When power is on, the relay operates […]
Mini Projects
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, as it uses LDR to make LED flicker like real flame and turns ON when its dark; also LDR controls the LED. Furthermore, in bright light the LDR has high resistance so LED stays OFF […]
Simple Motor Powered Emergency Flashlight Circuit
This Simple Motor Powered Emergency Flashlight Circuit provides an easy way to create emergency lighting; it uses a motor as a generator to produce electrical power. Also, power goes to LED for light and charges the supercapacitor and then it turns motor to charge. Circuit Working: Parts List: Components Values Quantity Resistors 220Ω 1/4 watt […]
Simple Darkness Detector Circuit
LED turn ON by LDR when dark and LDR and resistor connect in voltage divider circuit. During bright light transistor base get low voltage so transistor stay OFF and during dark come LDR resistance goes down and base voltage goes up with transistor turn ON and LED light up. Hence, this Simple Darkness Detector Circuit […]
Simple Non-Contact 220V AC Detector Circuit using IC 555
Playing with electric wire is risky especially if we do not know electronics, also wrong use of electricity can be dangerous. So better to be safe before touching wire and first check if some electricity with leakage voltage is still there. This article for Simple Non-Contact 220V AC Detector Circuit using IC 555 show how […]
Simple Voltage Follower Circuit using Op-amp IC 741
A Simple Voltage Follower Circuit using Op-amp IC 741 provides an output that matches the input; therefore, engineers also call it a buffer amplifier or a unity-gain amplifier. IC 741 op-amp is cheap and useful that is why so many people use it. Voltage follower has high input impedance and with low output impedance and […]