conntaxman
- Jun 17, 2011
- 89
- Joined
- Jun 17, 2011
- Messages
- 89
On a lm317 I need someone to explain R1 and R2 . on the 317 i will have to set the voltage out and the current out.They have calculators on line but Im missing were the current part comes in. Im going to make a solar battery charger and led light to only shine at night.Like a garden light.I will have to add the led light part later.I will be useing Two 3.2 volt x 1000mah in series. so 6.4 volt. I read some were to charge these battery you go 10 percent of the battery current. So i will need about 200 ma. at about / i think 7 volts.here is the link
http://electroschematics.com/4746/solar-charger-circuit/
So setting up the 317 for about 7 volts would be by this page
http://www.reuk.co.uk/LM317-Voltage-Calculator.htm
R1:390 and R2:1800
Now that is the voltage. But how do I calculate for the amp"s or current.That is on this page
http://www.reuk.co.uk/LM317-Current-Calculator.htm
But isn't that the same resistor as R1
Thanks John
Sorry but im just trying to learn.
http://electroschematics.com/4746/solar-charger-circuit/
So setting up the 317 for about 7 volts would be by this page
http://www.reuk.co.uk/LM317-Voltage-Calculator.htm
R1:390 and R2:1800
Now that is the voltage. But how do I calculate for the amp"s or current.That is on this page
http://www.reuk.co.uk/LM317-Current-Calculator.htm
But isn't that the same resistor as R1
Thanks John
Sorry but im just trying to learn.