I need to build an adapter that will take a variable dc signal that ranges from 4-9 volts and cut it down to 0-5 volts proportionally. In other words, I need to knock 4 volts out of a dc signal. If the input is 4.5 volts I need the output to be .5 volts, input 6.5 volts output 2.5 volts, etc..
Any thoughts?
Any thoughts?