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