Hi!
I want to build a current source by fixing a current value with a PID controller, in order to get the error signal, the voltage on the load will be measured with a microcontroller ADC, the PID control stuff will be done with the controller, and by knowing the current and the voltage values the load resistance can be found so change in voltage will be the PID perturbation, therefore it will increase or decrease the error signal.
I'm planning to use a DAC board with my controller in order to use a transconductance amplifier to fix a current value. I've understood that mosfet are transconductance devices, which comercial mosfet can I use to fix a current between 0 and 1 amp?
I've found an opamp configuration which is a voltage to current amplifier (schematic is attached to the post), is it better to use a opamp instead of a single mosfet transistor, if it's better choice, which opamp should I use?
Thanks for reading!
I want to build a current source by fixing a current value with a PID controller, in order to get the error signal, the voltage on the load will be measured with a microcontroller ADC, the PID control stuff will be done with the controller, and by knowing the current and the voltage values the load resistance can be found so change in voltage will be the PID perturbation, therefore it will increase or decrease the error signal.
I'm planning to use a DAC board with my controller in order to use a transconductance amplifier to fix a current value. I've understood that mosfet are transconductance devices, which comercial mosfet can I use to fix a current between 0 and 1 amp?
I've found an opamp configuration which is a voltage to current amplifier (schematic is attached to the post), is it better to use a opamp instead of a single mosfet transistor, if it's better choice, which opamp should I use?
Thanks for reading!