MGL Avionics User Forum

Hello,

I use iefis explorer with RDAC. I need to connect an active fuel sensor into the RDAC to replace a westach probe.

The problem is that it sends a signal from 0 to 5 volts.
In the RDAC documentation that it is mentioned 0 to 3.3 volts. I don’t know how to wire a voltage divider bridge with a single output wire nor if the RDAC can support more than 3.3 volts. Do you have any ideas ?

The easy way would be to pick up a 1K ohm 10 turn potentiometer from someone like Digi Key. Connect one end to ground and the other to a 5 volt supply and measure the voltage on the wiper arm to ground as you turn it. Turn till you get 3.3volts and then use this as your voltage divider. You can do the same with fixed resistors using a 330ohm in series with a 680ohm resistor to ground. The junction of the 2 should be 3.3 volts.