Hello Everyone >>

I need to make a charger for 9 volt battery , have a circuit but want some help about resistor of regulator ..

<snip>

my questions on :

1) R1 ,R2 ,R3 values to make a regulator work and also with transistor to make a LED On if it still charging and Off if it fully charging if the battery capacity is 175 NiMH

2) If I'll use lm317 what changes in the circuit ?

and finally please write the equations you have used to find Resistors values to apply it if I have changes ..

thanks

I need to make a charger for 9 volt battery , have a circuit but want some help about resistor of regulator ..

<snip>

my questions on :

1) R1 ,R2 ,R3 values to make a regulator work and also with transistor to make a LED On if it still charging and Off if it fully charging if the battery capacity is 175 NiMH

2) If I'll use lm317 what changes in the circuit ?

and finally please write the equations you have used to find Resistors values to apply it if I have changes ..

thanks

Last edited by a moderator: