I am connecting servo amplifiers to an ICM2900 OPTO module. I am configuring for low enable (replacing the ic chip with a 7406 model), pulling the resistor pack to make the it an open collector (ampenx,y,x....) .
The enable pin on the servo amplifier sources 15v. (Sanyo 27BA100FFT and 27BA030FXT amplifiers)
The goal is to sink the signal to ground.
I read and have been informed that the current limit of the ic chip is 40mA.
When I manually short the amplifier enable pin to ground through a mulit-meter, the readings are 7.4-7.6mA at about 12.75vdc.
I have seven amplifiers.
How do I protect the ic chip? I assume I will place resistors in line, but don't know how to determine the proper size or if that is the right strategy.
I think this smiliey describes it best :drowning:
Thanks