Hi,
I need a variable current source that can provide the following constant currents:
2.8mA
16.8mA
42.8mA
Each can vary slightly if required. Its for a batt charger, so each current must be switched on/off via a processor.
I dont want to use a IC, too expencive, so looking for a solution using descrite devices.
I have a 3.6v NiMH @ 280mA, so the above relates to 0.01C, 0.06C and 0.5C charging rates.
I've got the code ready to charge the battery, detect peak etc... but no matter what i try, i cannot design the constant current generators.
The avaliable supply voltage is 15VDC.
Please someone suggest somthing, been working on this section of the project for too long now, and i just want to move on!!
Joe
I need a variable current source that can provide the following constant currents:
2.8mA
16.8mA
42.8mA
Each can vary slightly if required. Its for a batt charger, so each current must be switched on/off via a processor.
I dont want to use a IC, too expencive, so looking for a solution using descrite devices.
I have a 3.6v NiMH @ 280mA, so the above relates to 0.01C, 0.06C and 0.5C charging rates.
I've got the code ready to charge the battery, detect peak etc... but no matter what i try, i cannot design the constant current generators.
The avaliable supply voltage is 15VDC.
Please someone suggest somthing, been working on this section of the project for too long now, and i just want to move on!!
Joe