TREE

The design of the charger is similar to that of many commercially available chargers. The charger consists of a mains adaptor, two resistors and a light emitting diode (LED). In practical use, this kind of charger is perfectly all right. Resistor R1 serves two functions: it establishes the correct charging current and it drops sufficient voltage to light the diode. This means that the LED lights only when a charging cur-rent flows into the battery. The charging current is about 1/4 of the battery capacity, which allows a slight overcharging, and yet the charging cycle is not too long (4–5 hours). Circuit diagram : NiCd Battery Charger Circuit Diagram The value of the resistors may be calculated as follows, for which the nominal e.m.f. and the capacity of the battery must be known. Adjust the output of the mains adaptor to 1.17 times the nominal battery voltage plus 3.3 V, which is the potential across R1. Note that the adaptor must be capable of supplying a current of not less th...

This is a very simple and low-cost Electronic Circuit Project of NiCd charger using with transistors. This NiCd charger allows simultaneous charging of up to seven NiCd batteries connected in series. This number can be increased if the supply voltage increases by about 1.65 V for each battery. NiCad Charger Using with Transistors Circuit Diagram: Given that T2 is mounted on appropriate heat radiator, the input voltage can be increased to a maximum of 25 V. Typically these loads to NiCd batteries a current equal to one tenth of the battery capacity. If current value is greater than indicated, the charging time must be reduced proportionally, to prevent damage to battery elements. The charging current is controlled by P1 between 0 mA to 1A current can be measured with a voltmeter connected parallel of R3 (which, to avoid additional calculations, has value, convenient to 1ohm). Lowering the value of R3, maximum output current can be increased to over 1 A. Circuit consume 15 mA current in ...