Hi all,
I need to design a circuit that does the following, I need to drive an instrument that has an op amp on it's signal input. 2 wires, one is ground the other is the input which has to go from -550uA to +550uA I would like to use a PWM output from a microcontroller to to send this varying signal to the input of this gauge. I know i'm going to have to use an op-amp driven from the PWM output of microcontroller but not sure how to make it swing from neg to pos or vice versa and at that low of current. Is this at all possible via PWM?
Thanks
Rob
I need to design a circuit that does the following, I need to drive an instrument that has an op amp on it's signal input. 2 wires, one is ground the other is the input which has to go from -550uA to +550uA I would like to use a PWM output from a microcontroller to to send this varying signal to the input of this gauge. I know i'm going to have to use an op-amp driven from the PWM output of microcontroller but not sure how to make it swing from neg to pos or vice versa and at that low of current. Is this at all possible via PWM?
Thanks
Rob