The above scheme is a motorcycle battery charger, which is intended only for charging motorcycle batteries as its has a low charge current and thereby saving the battery plate from premature failure.
This motorcycle battery charger circuit generate current of 285 mA to 750 mA. Resistor R3 the on the front panel of your device can be adjusted within these limits. The charging current for motorcycle battery, you must install in amperes numerically equal to about one tenth the capacity of the rechargeable battery in ampere-hours.
Details : AC transformer is made to W-shaped magnetic core SH28 x 30, primary winding contains – 1120 revolutions mark PEL-2 in diameter – 0.32 mm, and the secondary winding for 12-volt battery contains – 130 turns of PEL-2 brand in diameter – 0.74 mm. If you have at your disposal only motorcycle battery voltage to 6 volts, then the manufacture transformator Tr1 can be challenge reading of 70, thus making provision for charging 12-volt battery or the number of secondary turns must be reduced to 70. If necessary, the motorcycle battery charger device can also be used to recharge car batteries, however, with the charging process may take 1-2 days.
