Single-tube constant current charger circuit

  
As shown in a practical single-tube constant current charger, which play a constant role transistor VT1, its current value is determined by the voltage regulator and R2. Genera
Single-tube constant current charger circuit - schematic

l election regulator about 3.3V, resistor R2 taken (30 to 60 Euro)/(1W ~ 2W), when the charge current is about 50mA ~ 80mA. R3 (200 ~ 500 ohms) and LED charging indicator composition circuit is connected as long as rechargeable batteries, LED will glow. If the LED does not light, the battery is bad. The circuit of 1 ~ 4 5 nickel-cadmium batteries, charging time is 12 to 14 hours. Transistor VT1 available 3DD15 or DS11 (plastic) power management, installation, VT1 tube should be added to the radiator. Two kinds of charger neither add charge control circuit should be used to grasp the charging time, in order to ensure safe charging.




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