Monday, February 10, 2014

Electronic Circuit Schematic Automatic NiMH Battery Charger using IC LM7805

Eltronicschool.- It is very important when we charge our re-charger batteries, we need indicator to know that our re-charger batteries full or not. It is need in order to our batteries can long life and having good endurance.

In this time we want to show you one of electronic circuit schematic of automatic NiMH Battery Charger using IC LM7805, that we hope you can practice this circuit to help you make your self automatic charger batteries.

Circuit Schematic

Figure 1. Automatic NiMH Battery Charger using IC LM7805 (

Component List

All component you can see from figure 1 above. The main component to stability +5V is LM7805 that very familiar now.


According figure 1 above, we will describe the how electronic circuit schematic will automatically indicate that the NiMH battery full or not when charge.

  1. LED in this NiMH charger circuit is working as a charging indicator so when the batteries become full charged the LED will go off. 
  2. The circuit can charge two NiMH rechargeable batteries at a time. 
  3. The circuit has a four different current sources like 50mA, 100mA, 150mA and 200mA which is selectable with the switch S.
  4. We can choose the suitable current source for your batteries for example if you want to charge 500mA NiMH rechargeable batteries you have to select 50mA current, for 1000mAh NiMH batteries select 100mA, for 1500mAh select 150mA and to charge 2000mAh batteries select 200mA

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