Free Circuit Diagram

This charger circuit is suitable for lead-acid battery, including flooded, gel, and AGM types. The automatic term means that this charger will stop charging automatically when the battery voltage reach a certain pint, indicating that the battery has been fully charged, and charging will be restarted if the battery voltage falls below that threshold. A [...]

Fluorescent lamp or tube lamp (TL) has good efficiency. This high efficiency feature make it suitable for battery operated lighting application. To drive the tube lamp, we need high voltage to make the gas inside the tube get ionized. Here is the schematic diagram of the fluorescent lamp circuit: To trigger the ionizing [...]

In application that demand for high current, Nicad (NiCd) rechargeable battery still has the unbeatable performance compared to NiMH and Lithium battery. The charger circuit here is smart in the way it handle the wrong polarity of the battery placement. The core of this battery charger circuit is the Q2, configured a constant [...]

This simple Batteries charger circuit is designed for NiMH/NiCd batteries. It need no micro-controller nor any programming. Linear Technology Corporation produce the LTC4060, an autonomous 1- to 4-cell, 0.4A to 2A linear NiMH and NiCd battery charger complete controller. Here are the main features: No Sense Resistor or Blocking Diode [...]

More efficient lead acid battery charger can be implemented using switch mode circuit. A switch mode for lead acid battery charger can be constructed using bq24105 battery charger controller. The bq24105 was originally designed to charge single-, two- or three-cell Li-ion and Li-polymer battery packs. Its features doesn’t include the control for lead acid battery [...]

This circuit is used to prevent the damaging effects of a reversed-polarity battery or short-circuit load. It is used to replace the simple fuse that usually used for overcurrent protection because the fuse has long reaction time and high resistance. This circuit consist of dual comparator, a combination of current amplifier, and external CMOS. A [...]