Single-tube constant current charger circuit

Published:2011/7/18 3:27:00 Author:TaoXi | Keyword: Single-tube, constant current, charger | From:SeekIC

The practical single-tube constant current charger is as shown in figure 2-20, the transistor VT1 has the function of constant current, the constant current value is decided by the voltage of the regulator tube and R2, the voltage regulator tube uses the 3.3V regulator tube, the resistance R2 is (30Ω-60Ω)/(1W-2W), at this time the charging current is about 50mA-80mA. The charging indicator circuit is composed of the R3(200Ω-500Ω) and LED, as long as you connect the rechargeable batteries to the circuit, the LED will turns on. If the LEd will not turn on, the battery is bad. This circuit can charge one to four Number five nickel cadmium batteries, the charging time is 12-14 hours. The transistor VT1 can use the 3DD15 or DS11 power tube.



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