I need a way to isolate several voltage sources around a large vehicle that feed a single voltage meter some distance away on a panel. Each source is selected by a momentary-spst (at the source).
Here is a block diagram, with 2 discrete options:
All current is DC. Voltage sources run 4.6 VDC to 54.0 VDC. Desired display accuracy is 0.1 Volt. All the power supplies share a common ground.
The (arbitrarily) colored areas display the core differences in the current two options. Option one (green) uses 'ultra-low loss diodes' (ideally an IC array), Option 2 (blue) uses typical signal diodes (1N4148) and a post diode voltage adjustment.
For option 1, the MAX4020 came to mind, but the voltages are out of range. Is their an IC / IC array designed for this?
For option 2, what is the best way to adjust the voltage up 0.7 V?
We're somewhat stuck with the basic layout of using multiple momentary-spst feeding a single voltage meter, so a rotary selector switch is out.
- updated 'mom' body text to 'momentary' for clarity.