Free circuit schematics - wiparat.com

Here is a simple charger circuit for charging SMF(sealed maintenance free ) batteries.The charger circuit being curernt and voltage regulated,can be safely used to charge SMF batteries of 1.2 AH rating.This circuit was actually designed in response to a request from a reader.With slight modifications you can use it for charging any sort of SMF [...]

Here is a simple but effective battery charger circuit using IC LM 317.The circuit can be used to charge 12Vlead acid batteries.The circuit is very simple and can be easily assembled on a general purpose PCB.
The heart of the circuit is IC LM 317 ,which is an adjustable voltage regulator IC.The pin 1 of the [...]

Here is a lead acid battery charger circuit using IC LM 317. The IC here provides the correct charging voltage for the battery.A battery must be charged with 1/10 its Ah value. This charging circuit is designed based on this fact.The charging curent for the battery is controlled by Q1 ,R1,R4 and R5. Potentiometer R5 [...]