Can anyone help with a solar circuit?
I'm trying to build a solar powered night light. What I would like is to have it charge during the day and automatically come on when it senses darkness. Here is what I've gathered so far, any suggestions are appreciated:
3AA rechargeable batteries (3.4V)
1 4.5 volt solar cell
4 White LEDs (20ma)
This is my first posting and I'm a (near) complete novice to electronics! Can anyone tell me if the photo-transistor or transistor needs a resistor and if so which one???
What resistor do I need for my LEDs???
How do I wire it so that my solar cell can recharge my batteries but not ruin my LED???
Thanks again and please feel free to chime in with your two cents =)