Stand-by Battery Charger
This simple circuit will find many applications as a battery eliminator for low power requirements. It consists of a transformer, a bridge rectifier and an elec...
Ideal Car Battery Charger
The usual chargers of battery automotive, are simple and cheap appliances that charge continuously the battery, with a rythm of few amperes, for the time where ...
Lead Acid Battery Discharge protector
In perfect discharge the batteries of lead acid, exists the fear they are destroyed. This circuit makes the work, this detection of discharge, protecting the ba...
Solar Charger circuit
Few years back, I had been working on a project for solar auto lighting. The light will turn on when the the solar panel voltage drop below a set point indicati...
PIC16F84 Solar Charger
The previous version of this device used pulse width modulation (pwm) to control the power from the five solar panels to charge the battery bank. Under full su...
FAST CHARGER controlled by a 68HC11
Note first the battery to be treated at the center of the figure. It is connected to contacts of a relay. The diagram shows the relay at rest. Under these condi...
Solar Battery Regulator/Controller
In the actual device the transistors are bolted to the aluminium case. The schematic diagram shown here represents how the circuit would be built if all compone...
Nicad/NiMH Charger
This device is built around a PIC12F675 (a dandy little part from Microchip). The number of cells (1 to 8) is programmed in using the one button. The cell co...
3.6 Volt Lithium Ion Battery Charger (PIC12F675)
Lithium Ion batteries pack a lot of power by weight compared to other types. There are 2 things that need to be handled differently than nicad on NiMH. They ca...
Backup Power System with PIC16F870
The PIC16F870 keeps track of battery voltage as well as both charging and discharging currents. It also drives the 4 digit display, and switches the AC and loa...
Battery charger and PSU
This circuit was created for digital cameras. It's known the digital cameras have considerable power consumption. For example my camera Minolta E223 requires ap...
Pulsed Charger for Lead Acid batteries (NE555)
The object is to get the cell voltage high enough for the sulphate to dissolve without boiling or melting the battery. This is achieved by applying higher volt...
Quick NiCd - NiMH Charger
The charger is build around a LM317 (click to download datasheet) adjustable regulator.
The charge starts when a battery is connected between pins JP1-JP4 or J...
Lead Acid Battery Charger with LED indicator
The above circuit is a precision voltage source, and contains a temperature sensor with a negative temperature co?ficient. Meaning, whenever the surrounding or ...
Mobile Phone Charger with CA3130
The circuit described here provides around 180mA current at 5.6V and protects the mobile phone from unexpected voltage fluctuations that develop on the mains li...
Simple Li-Ion Battery Charger
Charging current is about 100+mA, which is the internally-limited maximum current of the LP2951. For those wondering, this is compatible with just about any sin...
Simple Lead Acid Battery Charger
The above pictured schematic diagram is just a standard constant current model with a added current limiter, consisting of Q1, R1, and R4. The moment too much c...
USB Single Cell Charger
Lithium Polymer Batteries are a very common source of power today. Many electronics gadgets have one inside, and they have some reasonable features. I've bought...
Free energy battery charger
As the circuit operates, the three sets of diodes with their isolation capacitors, build up an increasing voltage on capacitor ?C1?. The voltage at point ?B? wi...
Automatic Charger with CD4541
The circuit is capable of supplying either a trickle (50 mA) or high-current (1-A) charge. You can select either charging method or an automatic mode that will ...