Battery Charger


Ni-MH Ni-Cd Adjustable Constant Current Charger

Ni-Cd Ni-MH Adjustable Constant Current Battery Charger Circuit This is a Adjustable Constant Current Ni-MH or Ni-Cd battery charger circuit. It can be used to get a constant current power supply. Here is the schematic diagram of the circuit: PARTS LIST R1 100Ω VR1 500Ω Preset C1 0.1µF C2 0.01µF D1 1N4001 Q1 BC140 IC1 LM317 […]


Simple Battery State Indicator

Many a time the outdoor audio or video recording becomes imperfect due to a ‘dying’ battery. If the battery voltage is less than 9V for a 12V recorder, the output during playback will not be of a good quality due to variations in the motor speed. Many car owners take their battery for granted, rarely […]


LM3914 12V Battery Monitor Circuit

LM3914 12V Battery Monitor Circuit This bar graph LED battery level indicator circuit is based on LM3914 monolithic IC from National Semiconductor that senses the voltage levels of the battery and drives the 10 light emitting diodes based on the voltage level that is detected. PARTS LIST R1 56kΩ R2 18kΩ R3 3.9kΩ VR1 10k […]


Battery Charge Nominal Discharge Indicator Circuit

12V Battery Charge Nominal Discharge (Low) Indicator Circuit This circuit monitors car battery voltage. It provides an indication of nominal supply voltage as well as low or high voltage. PARTS LIST R1 1.5kΩ R2 1.5kΩ R3 1kΩ R4 1.5kΩ R5 1.5kΩ R6 10kΩ R7 10kΩ VR1 10kΩ Preset VR2 10kΩ Preset D1 Green LED D2 […]



Lead-Acid-Battery Regulator For Solar Panel Systems

The design of solar panel systems with a (lead-acid) buffer battery is normally such that the battery is charged even when there is not much sunshine. This means, however, that when there is plenty of sunshine, a regulator is needed to prevent the battery from being overcharged. Such controls usually arrange for the superfluous energy […]


Mobile Charger with Voltage Converter

The circuit allows a simple and safe charging of 1-10 Ni-Cd or Ni-MH cells from a 12V source. The voltage converter can be operated at 6V, in this case is the max. output voltage 12V (no load). The performance can be improved through the use of Schottky diodes (D2/D3). D4 (LED) can omitted if you […]


5 A Stable Car Baterry Charger

This Battery Charger circuit  allows you to charge the battery 5A constant current source that stable over time between recharging. Charging process is accompanied by the emission of diode D1 – AL310A, and D3-AL310B. IC A1 – 142EN2, Transistors: T1, T3 – KT815, T2 – KT819 (radiator), T4 – KT819. Zener: D2 – KS156, D3 […]


Simple 12 Volt Battery charger

This kind of battery charger circuit will quickly and easily recharge almost every lead acid battery pack.This battery charger supplies maximum current till the current drawn by the battery falls to 150 miliamper. At this point, less voltage will be applied to complete and avoid over charging. Once the lead acid battery is completely charged, […]


Automatic Low-Power Emergency Light

Portable, simple and inexpensive unit, Useful for personal use Here is a white-LED-based emergency light that offers the following advantages. 1-It is highly bright due to the use of white LEDs. 2-The light turns on automatically when mains supply fails, and turns off when mains power resumes. 3-It has its own battery charger. When the […]