after i sucessfully made the device i find out that if i want 4 led then i will need 8 AA battery. The problem is 4 leds are not enougth for my project . So i tried to find ways to add more leds.
After reading many knowledge about electronic circuit i finally figure out a way.
Series and parallel circuits
just make the circuit parallel then i can use 3V (ie 2 AA battery) Then i can light up as many LED as i want.
Then i start to change the circuit diagram.
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