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This is the very simple and Cheap cost Universal charger for NiCD - NiMH batteries Circuit Diagram. This circuit is ideal for car use. It has ability to transform a mains adapter for the charger. This can be used to recharge cell phones, toys, video batteries, MP3 players, ... and is selectable charging current. A LED is located in the circuit to indicate charging. Can be built on a breadboard or a general purpose PCB. Hope you like it. Universal charger for NiCD - NiMH batteries Circuit Diagram Parts: R1 = 120R-0...5W R2 = See Diagram C1 = 220uF-35V D1 = 1N4007 D2 = 3mm. LED Q1 = BD135 J1 = DC Input Socket Specifications: Ideal for in car use. LED charge indication. Selectable charge current. Charges Ni Cd or NiMH batteries. Transforms a mains adapter into a charger. Charge cellular phone, toys, portables, video batteries … Features: LED function indication. Power supply polarity protected. Supply current: same as charge current. Supply voltage: from 6.5VDC ...

This is a simple Batteries charger for NiMH/NiCd.It Requires No Microcontroller or any Firmware .Linear Technology Corporation introduces the LTC4060, an autonomous 1- to 4-cell, 0.4A to 2A linear NiMH and NiCd battery charger. The LTC4060 includes all the functions required for a battery charger circuit, operating without the aid of a microcontroller or firmware. The design is simple and needs only three passive components. The LTC4060 also eliminates the need for a sense resistor and blocking diode, which increases efficiency and lowers the solution cost. This IC is targeted at applications including portable medical equipment , automotive diagnostic systems and industrial/telecom test devices. Features Complete Fast Charger Controller for Single, 2-, 3- or 4-Series Cell NiMH/ NiCd Batteries No Firmware or Microcontroller Required Termination by –?V, Maximum Voltage or Maximum Time No Sense Resistor or Blocking Diode Required Automatic Recharge Keeps Batteries Charged Programmabl...

The project utilizes MAX712/MAX713 fast charge controllers in order to build a smart & fast NiCd/NiMH battery charger.   The MAX712 is designed for NiMH batteries and the MAX713 is for NiCd batteries where the battery-fully-charged sensing method is the only difference between them. The values for some of the components included in the circuit can be chosen using the reference from Maxim. Depending on the number of cells of the battery pack intended to charge as well as the charging time, those values may vary. The charger won’t be able to charge packs with more than six 1.2V cells if it is powered only with 12V. the MAX will get hot and the charging current won’t be what is expected from the value of the sensing resistor if something bigger than 12V would be tried. This is due to the sinking of as much current as possible from the base of the power transistor as it tries to obtained up to 250mV voltage drop on the sensing resistor. The timer feature of MAX712/713 cannot be di...