Electronics > Projects, Designs, and Technical Stuff

Electronic loads and loads

(1/2) > >>

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"?

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod