SH designs charger Mod for higher amps

[sajeev]

Hi all,

If i change the LM317 to an LM350, will I get more amps from this charger ? what other stuff would i have to change ?

thanks,

sajeev

[Chippie]

The 1 ohm current sensing resistor for a start...depends which circuit you are using.....

[sajeev]

the SH designs charger for 3 cells with LED indicator

[Chippie]

The LM350 is rated for 3 amps,therefore the current limiting resistor needs sizing accordingly.

The resistor ca be calculated from the Vbe drop across the transistor, typically 0.6v. At 3 amps then the resistor needs to be Vbe/3 or 0.2ohms.

The resistor can be made up by paralleling values to give the value needed..

[sajeev]

so if i want 2 amps out, then i need a 0.3 ohms resistor ?

[Chippie]

so if i want 2 amps out, then i need a 0.3 ohms resistor ?
yes

[sajeev]

and all other components remain same ?