Man of Honour
Hopefully an OCUK electronics guru can help me on this one.
I'm looking for a schematic/bill of parts required to build a constant current sink circuit measuring battery capacity
So far I've found the LM317 and LM338 which can be use as a constant current sink however they will only allow me to sink upto 1.5A for the 317 and 5A for the 338.
For a real world representation of capacity I need to be able to sink 15-20A.
My first though was to use 8x LM338 in parallel with each sinking 2.5A with a 0.5ohm 5w resistor, however I can't find any information as to whether this actually work in practice or there is a better way
I'm looking for a schematic/bill of parts required to build a constant current sink circuit measuring battery capacity
So far I've found the LM317 and LM338 which can be use as a constant current sink however they will only allow me to sink upto 1.5A for the 317 and 5A for the 338.
For a real world representation of capacity I need to be able to sink 15-20A.
My first though was to use 8x LM338 in parallel with each sinking 2.5A with a 0.5ohm 5w resistor, however I can't find any information as to whether this actually work in practice or there is a better way