I have this system that sends a signal wire from a controller to a multi-position switch. Every state this switch has run the signal into a resistor, the controller know what state was pressed by reading the voltage of its own signal wire.
I want to get rid of the switch(es) and use a digital pot to 'simulate' the same thing.
Problem is: The system is setup so that it has 2ma running in that signal wire. My digital pot can handle only a measely 1ma.
I need some way to cut that amperage down (i cant modify the exisiting system) without changing the voltage.
I figured that one way to do this (i'm not certain this will work) would be to place a small 1/4W resistor inline. Since the original resistors are 1/2W i think this will only let 1ma though there.
Am I even close to being right ?
I want to get rid of the switch(es) and use a digital pot to 'simulate' the same thing.
Problem is: The system is setup so that it has 2ma running in that signal wire. My digital pot can handle only a measely 1ma.
I need some way to cut that amperage down (i cant modify the exisiting system) without changing the voltage.
I figured that one way to do this (i'm not certain this will work) would be to place a small 1/4W resistor inline. Since the original resistors are 1/2W i think this will only let 1ma though there.
Am I even close to being right ?