Automatic emergency light use battery and give light when power is gone. Lamp turns ON itself when main power fails and is good for home, office or anywhere which need extra light. It is best to use 6V lead acid battery or 5×1.2V NiCd cells. The design for Battery Operated Automatic Emergency Light Circuit is […]
Battery Charger Circuits
12V Battery Powered Fluorescent Lamp Driver Circuit
Fluorescent lamp need high voltage AC to start and keep glowing. This 12V Battery Powered Fluorescent Lamp Driver Circuit uses 12V battery to run fluorescent lamp. It change low voltage DC from battery to high voltage AC for the tube. It is good for battery device and emergency light. Circuit has oscillator, MOSFET switch and […]
Transistor Based Battery Heater Circuit
Transistor Based Battery Heater Circuit uses 12V DC with good heat and very portable. Circuit is good for outdoor, no-electric place, small incubator and emergency heat. It uses astable multivibrator with transistors. Transistors switch power transistor and run heat coils. LED show if circuit is working. Circuit Working: Parts List: Component Value Quantity Resistors (All […]
Battery Level Indicator Circuit using IC MN13811
This tutorial teaches us about Battery Level Indicator Circuit using IC MN13811 It shows when battery is low and indicates us to recharge. Use MN13811 IC and 2 transistors as they work together to turn ON the LED when battery is low. The circuit is good for small 3V battery devices. It is for very […]
Advanced Ni-Cd Battery Fast Charging Circuit
Ni-Cd batteries are used in many devices and they have high energy and can recharge. But normal charging is slow and is not good, so it can harm battery life. To fix this Advanced Ni-Cd Battery Fast Charging Circuit using MAX712 chip is made. This charger charges fast, safe and works well for Ni-Cd. This […]
Battery Charger Circuit using IC LM317
Battery Charger Circuit using IC LM317 is an useful project in electronics. It charges rechargeable batteries well. Main part is LM317 IC which is a voltage regulator. It is used in power supply and battery charging. It is good for 12V lead-acid battery charging. This post show how LM317 IC charger works, what calculations to […]