Battery charger with LM317
An LM317 voltage regulator is configured as a constant-current source. It is used to supply the 50 mA charging current to S01-S06, an array of AA-cell battery h...
Solar cell battery charger circuit
The circuit charges a 9-V battery at about 30 mA per input ampere at 0.4 V. Ul, a quad Schmitt trigger, operate as an astable multivibrator to drive push-pull T...
Wind battery Charger
The dc motor is used as a generator with the voltage output being proportional to its rpm. The LTC1042 monitors the voltage output and provides the following co...
Charger circuit V
The charger is based on a charging voltage of 2.4 V per cell, in accordance with most manufacturers' recommendations. The circuit pulses the battery under charg...
NiCad Charger IV
This zapper clears internal short in nickel cadmium batteries by burning it away. CAUTION: The negative battery terminal is connected to one side of the ac line...
NiCad Charger with temp control
One way to charge Ni-Cad batteries rapidly without abuse is to measure cell temperature and taper the charge accordingly. The circuit uses a thermocouple for th...
Lithium charger circuit
Charging is accomplished with a constant current of 60 mA for AA cells to a cutoff voltage of 2.4 V per cell at which point the charge must be terminated. The c...
Ni-Cad battery charger
The short in a Ni-Cad battery can be "burned off" with this zapper. Use of the SCR keeps heavy discharge current from damaging switch contacts....
Single cell charger
This circuit detects a full-charge state and automatically switches to a float condition—from 240 mA to 12 mA.
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Rapid battery charger
Rectified and filtered voltage from the 24 Vac transformer is applied to the LM723 voltage regulator and the npn pass transistor set up for constant current sup...
Automatic switch for batteries
Nowadays the batteries are gaining more and more power, being the only components that fail to provide energy for portable electronic devices. The evolution is ...
Ni-Cd Baterry Charger 12-18V
A clever charger circuit that safely can charge any Ni-Cd battery. Offers charge current sellection, polarization detection and protection and the ability to co...
Fast charge Controller with MAX712 / MAX713
The MAX712 and MAX713 are nickel cadmium (Ni-Cd) battery fast charge controllers which will fast charge batteries from a DC source at least 1V higher than the m...
fixed Current Battery Charger
A simple method of charging a battery from a higher voltage battery is shown in the circuit below to the left. Only one resistor is needed to set the desired ch...
12V Battery Meter with 4 LEDs
In the circuit below, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A ...
3 LED - 1 Cell battery tester
The device serves to quickly establish the status of an indicative power cells. I built it for his children, so they can determine the degree of self-discharge ...
9 V NiCd or NiMH accumulator charger
Most universal chargers to charge the battery 9 V (8.4 V more). However, while the charging of NiCd or NiMH rechargeable governed by a special circuit or a micr...
NiCad charger with independent discharge
If you use different batteries with actual capacity, with different self-discharge rate of batteries from different manufacturers, you will perhaps throw furthe...
Single Cell Lithium-ion battery charger
The rechargeable Li-ion, I began to intensely interested last summer, when I managed to bring a holiday without a phone charger. After several experiments invol...
Built-in battery charger, Li-Ion
Build-in charger for instruments powered by single lithium-ion or Li-Pol accumulator. If external power supply not conected to charger, current back from the ac...