Hello
I'm trying to turn on variable resistances from 2 MOhms to as small as 5 kOhms from a PIC 40X2 my initial design had the PIC controlling a relay driver ULN2003A which then turns on different relays each connected to a specific resistor value between a 820 V supply. However, I was looking for an improvement to this in which I can have like a variable pot in which I can tune in the resistance I want from the PIC. I could only find digitally controlled resistors but they have 30 V operating voltage max. Does anyone have any idea if that is even possible?
Thanks in advance
I'm trying to turn on variable resistances from 2 MOhms to as small as 5 kOhms from a PIC 40X2 my initial design had the PIC controlling a relay driver ULN2003A which then turns on different relays each connected to a specific resistor value between a 820 V supply. However, I was looking for an improvement to this in which I can have like a variable pot in which I can tune in the resistance I want from the PIC. I could only find digitally controlled resistors but they have 30 V operating voltage max. Does anyone have any idea if that is even possible?
Thanks in advance