| Electronics > Projects, Designs, and Technical Stuff |
| Electronic loads and loads |
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| 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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