Mesa 5I25 + 7I76 + PWM

I am looking for a way to control, via software, the current going trough my wire in my foam cutter. So I need to interface a programmable current source.

As I see it, my options would be :

PWM controlled current : Is it possible to use one of the outputs on a 7I76 connected to a 5I25 as a PWM signal ?

Analog controlled current : Use the spindle variable voltage output as a signal to drive a current source ?

Serial controlled current : Find a rs242 controlled current source

I do not have a current source yet. Would any of you have suggestions ?

Regards

J Blain

Probably easiest would be to use PWM with DC wire power
(maybe just rectified and not filtered)
and a single MOSFET to switch the wire power with the PWM

This would be a variable voltage, not current source.

The PWM could be software generated on 7I76 field outputs. or if higher resolution and higher frequency PWM was needed
a spare step/dir pin could be used for hardware PWM with a special 5I25 config

Wrong thread, sorry.