HI all,
I'm after some help /advice if anyone can help please.
What i want to do is keep a constant current output of 500 milli amps on a load that is changing is resistance / conductivity. At the moment when the resistance changes, the current runs away. Supply voltage is between 12 - 40 volts, and the current draw needs to stay around 500ma. In this situation the resistance starts off high - more voltage needed to keep current at 500ma but as the resistance starts to drop i need to be able to regulate the current at 500ma by reducing voltage. I've read about current sensing, current regulators, but i'm not sure what i need.
Any help would be greatly appreciated.
thanks in advance
Andrew
I'm after some help /advice if anyone can help please.
What i want to do is keep a constant current output of 500 milli amps on a load that is changing is resistance / conductivity. At the moment when the resistance changes, the current runs away. Supply voltage is between 12 - 40 volts, and the current draw needs to stay around 500ma. In this situation the resistance starts off high - more voltage needed to keep current at 500ma but as the resistance starts to drop i need to be able to regulate the current at 500ma by reducing voltage. I've read about current sensing, current regulators, but i'm not sure what i need.
Any help would be greatly appreciated.
thanks in advance
Andrew