In many electronic circuits, wrong battery connection can damage sensitive components, therefore, a Simple Reverse Polarity Protection Buzzer Alarm Circuit gives an early warning before damage happens. This circuit is simple, low cost and easy to build, also it uses common parts like diode, resistor, LED and buzzer. When we connect the supply in the […]
Battery Charger Circuits
Simple SCR Based Low Battery Display Circuit
A Simple SCR Based Low Battery Display Circuit helps us know when the 9V battery voltage drops near the critical level. For example, if the 9V battery level reaches 8.3V or 8.6V then the LED glows and because of this, the user can replace the battery before the connected device stops working. This circuit uses […]
Simple 1.5V Single Cell LED Flasher Circuit
In our previous article, we made a Simple 1.5V White LED Flasher Circuit using transistors and ferrite coil, but in this article we have design a Simple 1.5V Single Cell LED Flasher Circuit without ferrite coil. This circuit works only with one 1.5V battery cell, so it is very useful for small battery projects and […]
6V Battery Backup Power Supply Circuit using 7805
This circuit is for 6V Battery Backup Power Supply Circuit using 7805 which gives stable output and also charges a 6V battery. When main power is ON, then circuit gives regulated supply and charges the battery, when power goes OFF then battery gives backup automatically. This circuit is useful for small electronics, emergency lights and […]
Automatic 12V Battery Charger Circuit with SCR Cutoff
This circuit is for Automatic 12V Battery Charger Circuit with SCR Cutoff, first it charges the battery and then it stops charging when the battery becomes full. Also, the circuit uses simple parts like transformer, diodes, SCR, resistor and capacitor and we can easily find these parts in market or online. So, this circuit protects […]
Transistor Based 12V Emergency Light Circuit
This project is for Transistor Based 12V Emergency Light Circuit system, which gives light when main power fails. The circuit uses transformer, bridge rectifier, transistor, relay, battery and few other components. When AC supply is present, battery charges and lamp stays OFF and when AC power goes OFF then battery gives supply and lamp turns […]