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Simple nickel-cadmium battery charger

2016-05-10 12:33  
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Simple nickel-cadmium battery charger
The circuit is shown in diagram 2-2. It consists of three terminal regulator 708 and four loads current source composed of triode VT2~VT5. VT1 and corresponding adjustable resistance RRP1, RP2 and switching tube S is used to control each roads charging current. When S is placed on position 1, charging current of each roads is 90mA; when S placed 2 and 3, it can get 100mA~300mA charging current by adjusting RP1 and RP2. If it adopts current above 200mA to charge, each triode should add radiator. Light emitting diode VD5~VD8 in diagram 2-2 is used as charge indicator. Whole circuit can supply by 220V mains, it also can supply by 12V storage battery. Charge time can count according to the following formula: Charging time(h)=Nickel-cadmium battery capacity(mAh)/charge current(mA) In actual use, charging time can proper extended.