Showing posts with label charger. Show all posts
Showing posts with label charger. Show all posts
Friday, December 12, 2014
Battery Charger for NiCad Batt
This battery charger circuit is designed for recharging NiCad batteries based on an AC-powered current source method.It can crank out as much as 1 amp and can be modified to go even higher by choosing different devices for Q1. Since this circuit uses AC line voltages and currents, please exercise extreme caution during assembly, turn-on, and test.
Saturday, November 8, 2014
Making a Solar Energy with iPhone Battery Charger
For faster charging, a larger solar cell can be attached to the bag. Enough power can be generated to fully charge an iPhone in about 5.5 hours and an iPod Touch in 4 hours using a slightly larger solar cell with 6V at 250mAh. The charger will automatically switch to trickle charging when the cell reaches full charge. The charging current is limited to 100mA when charging using the mini USB port and the charging is limited to 280mA when charging using the barrel plug jack
Thursday, October 23, 2014
Adapter power supply and charger circuit
Basically adapter, power supply and charger circuit has a similar construction which consists of a transformer, rectifier (rectifier) and smoothing the voltage. For there is usually an additional power supply voltage stabilizer of voltage regulator IC LM series 78XX or 79XX .
Below is a schematic circuit adapter, power supply, or battery charger (for gadgets, mobile phones, MP4player, smartphone) that is equipped with a 5V voltage stabilizer:
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| Adapter, power supply and charger circuit |
Thursday, August 21, 2014
NiCad Battery Charger
This simple and low cost battery charger uses a single transistor as a constant current source. The voltage across the pair of 1N4148 diodes biases the base of the BD140 medium power transistor. The base-emitter voltage of the transistor and the forward voltage drop across the diodes are relatively stable. The charging current is approximately 15mA or 45mA with the switch closed. This suits most 1.5V and 9V rechargeable batteries.
The transformer should have a secondary rating of 12V ac at 0.5amp
Wednesday, August 20, 2014
5v Powered Charge Pump Battery Charger
The schema below will trickle charge a four cell pack of AA or AAA NiMH batteries. The schema draws current from the +5v available a USB connection and pumps about 70ma of current into the battery. This should be enough current to fully charge a pack of 2500ma-hour cells in about 36 hours. The schema uses a single 74HC14 hex Schmitt trigger inverter in conjunction with a voltage doubler charge pump schema.
Monday, August 11, 2014
Battery charger with LM317 Wiring diagram Schematic
Battery charger with LM317 Circuit Diagram. 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 holders. Each of the battery holders is wired in series with an LED and its associated shunt resistor. When the battery holder contains a battery, the LED glows during charging. Each battery holder/LED combination is paralleled by a 5.1-volt Zener diode. If the battery holder is empty, the Zener conducts the current around the holder.
A timing schema prevents overcharging. When power is applied to the schema, timing is initiated by IC2, a CD4541 oscillator/programmable timer. The output of IC2 is fed to Ql. When that output is high, the transistor is on, and the charging schema is completed. When the output is low, the transistor is off, and the path to ground is interrupted.
Battery charger with LM317 Circuit Diagram
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