Electronics > Projects, Designs, and Technical Stuff
My Electronic Load
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MarkF:

--- Quote from: Steven Waring on April 17, 2020, 10:27:31 pm ---The input filtering was me experimenting with filtering in general.  I just experimented with it until the output looked smooth. 

The extra resistors are starting points for feedback to the Arduino, just not in use yet. 

This is very much a work in progress.  It looks like in the simplified circuit you posted that the filtering is happening on the input and out of the second opamp stage, is that correct?

I think I am going to put in a parts order and get some more appropriate resistors and mosfets before I go much further on this design.  I do like the looks of IRFP250MPBF.

--- End quote ---

I only have a very minimal filter on the set value.

A little thinking out loud for an Arduino interface:



I have seen the IRFP250 used in some electronic load products.
MarkF:
The oscillations in your screen captures are most likely due to your direct connections to the MOSFET.

The values I choose are simply because I already used them in the 10:1 voltage divider.
Start with 100Ω and 1KΩ resistors and a 10nF capacitor.
The Gate resistor probably needs to be at least 50Ω and
the capacitor needs to be at least 3 or 4nF.

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