Reading Spikes of Voltages of -/+50V from other source.

TAJS-C:
I've tried this, and it should work (tested with breadboard and multimeter).

I measured current draw across the resistor (which I swapped out for a 5K6, for now, first one I found in box) and found it as 11ma for 60 volts.

What I didn't expect was the ridiculous amount of heat it gave of!

Burnt my fingers touching the damned thing, haha!

This doesn't seem normal for a 10ma draw, what am I doing wrong?

Also.... sorry to be a pest.... any suggestions for the protection diode? I don't want to end up ordering the wrong thing!

Scrap that bit... thought my resistors were 0.5w, but were 0.25w.

Will try and get a >3w one.

But, still not 100% on what type of diode I'll need, as will need to reject +100v.