Electronics > Projects, Designs, and Technical Stuff
Electronic loads and loads
PerranOak:
I would quite like to build an electronic load: a fun project, I imagine.
Something small and simple: up to an amp-ish and, say, up to 20V-ish.
Does anyone know of a good project/schematic they could recommend please?
MarkF:
This is what I built:
Also check out J_Diddy_B's project:
https://www.eevblog.com/forum/projects/dynamic-electronic-load-project/
Kleinstein:
One should get away without the trimmer for the reference. One may also get away without the buffer after the pot.
On the other side it may be a good idea to limit wind up in case the voltage drops too low. This could be something like an OP limiting the set voltage at the switch to something like 3 times the load voltage. At low voltages the load would than turn over from constant current to constant resistance (e.g. 3 x the shunt, should be larger than shunt + FET R_on + Amp-meter).
MarkF:
--- Quote from: Kleinstein on December 14, 2019, 10:12:46 pm ---One should get away without the trimmer for the reference. One may also get away without the buffer after the pot.
--- End quote ---
Right. I have not populated the trim pot. It's just on the PCB in case.
The op-amp buffer after the voltage reference uses the 2nd op-amp in the dual package. It probably is not needed either.
Edit: Without the op-amp buffer, the 10:1 voltage divider would be affected since the pot value is so near the voltage divider values.
--- Quote ---On the other side it may be a good idea to limit wind up in case the voltage drops too low. This could be something like an OP limiting the set voltage at the switch to something like 3 times the load voltage. At low voltages the load would than turn over from constant current to constant resistance (e.g. 3 x the shunt, should be larger than shunt + FET R_on + Amp-meter).
--- End quote ---
Sorry, I don't understand what you are getting at.
Maybe show a circuit...
PerranOak:
Cheers mate.
What's "REF02"?
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