New advanced PI project

[Carl-NC]

Measuring coil current is best done with a current probe. If you don't have one then you can either place a low-ohm resistor in the current path or wrap a pick-up coil around a wire in the current path. In H-bridge drivers the easiest place to do this is where the lower MOSFETs connect to ground. In either case trying to see the on-state current variation will be difficult. You might try a larger shunt resistor with a parallel Schottky diode to minimize transient effects.

[Tinkerer]

I've been trying to figure how to measure change in coil current during the target sample and ground sample periods. Any thoughts?

https://www.geotech1.com/forums/atta...3&d=1655214071

easy with the simulation, don't know how with real circuit.

It is indeed difficult to measure the current to the high accuracy needed. I use a proxy.
With a differential preamp, the offset produced by the TX slope becomes easily noticed.

You can also change the cycle time from 50us to 100us. If the current is fairly constant, the peak current will change little.

[Op04]

del

[Detectorist#1]

Hi Tinkerer,
What new in this project? Some final schematic of the parts of this project or you continue to think on deep theory on the problem?

[Tinkerer]

Hi Detectorist,
If you want to work on that project, I will be glad to give you all the assistance I can. What do you want to know?