[Matt Krass]

Originally Posted by techhelpbb

Okay, but the current sensing resistor in this case is limiting the current to the Victor as well. So you can't fully test the Victor's power range like that. Plus I don't think they have the same on-state resistance so the Jaguar might drop more voltage. Might not matter for what you plan.

I thought you planned on powering the same load with both speed controls, because you started off in the singular tense in the first proposition post. Clearly, however, you intend to use 2 loads and that's just fine.

The only thing is that the terrible things (as you put it before) involved here are not really inductive or motors?

I sort of ask because while I understand the heat concerns entirely, obviously there are quite a few other concerns in the comparison.

I fully expect they don't have the same on-resistance, that is why I want to go for constant current loads, so we can measure the performance of the FETs, getting an empirical comparison of the 3 FET leg of the Victor vs the 2 FET leg of the Jag. If we measure the voltage drop and temperature across the FETs on each side we can see which heats up faster, which loses more power to heat, etc.

As long as the power source doesn't run out of volts and the load can compensate, the current sense resistor should be canceled out by the adaptive load.

Matt