Never lose connection again, make this Small UPS Circuit for Router Backup. When a power cut occurs, the internet goes off and the router and modem stop working; therefore, a small UPS can solve this problem. This give backup to DSL modem and WiFi router and also this circuit is with simple parts, easy to […]
Battery Charger Circuits
Battery Operated Automatic Emergency Light Circuit
An automatic emergency light uses a battery and provides light when the power goes out. Lamp turns ON itself when main power fails and is good for home, office or anywhere which need extra light; also it is best to use 6V lead acid battery or 5×1.2V NiCd cells. In addition, the battery-operated automatic emergency […]
Transistor Based Battery Heater Circuit
Transistor Based Battery Heater Circuit uses 12V DC with good heat and very portable; also circuit is good for outdoor, no-electric place, small incubator and emergency heat. Furthermore, it uses astable multivibrator with transistors and this transistors switch power transistor and run heat coils and finally, LED show if circuit is working. Circuit Working: Parts […]
Car LED Voltmeter Circuit using IC LM324
Car LED Voltmeter Circuit using IC LM324 is useful project to check car battery voltage, here, LEDs show different voltage which is easy to see battery condition. Main part are LM324 op-amp which act like voltage checker and voltmeter measures voltage between two points. Hence, this circuit is an LED voltmeter using the IC LM324 […]
Battery Level Indicator Circuit using IC MN13811
This tutorial teaches us about Battery Level Indicator Circuit using IC MN1381, as it shows when battery is low and indicates us to recharge, so use MN13811 IC and 2 transistors as they work together to turn ON the LED when battery is low. Also, the circuit is good for small 3V battery devices, as […]
Advanced Ni-Cd Battery Fast Charging Circuit
Many devices use Ni-Cd batteries because they provide good energy storage and can be recharged; however, normal charging is slow and inefficient and it can reduce battery life. To fix this, we design an Advanced Ni-Cd Battery Fast Charging Circuit using the MAX712 chip, also this charger provides fast, safe and reliable charging for Ni-Cd […]