Possible Shield Requirements Analysis

[steamboat]

Hello James,

I have the new servo mount for Macropede in print. While printing I thought about how to measure the servo current. What about to use the logic chip in the servo as current probe?!

The HK servos use the ME9926:
http://www.force-mos.com/db/pictures/mod...828957.pdf

Other servos also need some "switch" which will have an internal resistance... At the free running HK servo I can measure 24 mV between D and S. Breaking it with the finger a little gives 26 to 27 mV - can't test high torque because the new gears are glued to it and have to dry out first...

All I need is an amplifier which can bring this some mV to a detectable voltage - don't know what to choose here in modern times ;.)

It would make me happy even if we can measure only one turning direction with this.