Electronics > Beginners
150w DC Load project (low cost, med difficulty)
Cliff Matthews:
Our good friend at Scullcom Hobby Electronics is back with final refinements to his Nano-controlled DC-load. For something that looks like it could be biult for under $100 its got some nice software options. The PCB looks reasonable but he elected to limit the fuse to 5 amps (not sure about software yet..). I'm curious, for testing batteries etc.. <24v 10amp, can the fuse and dual diode be bypassed without effect on calibration?
Cliff Matthews:
AllTheGearNoIdea:
That looks about a hundred times better than the one I built. This guy has some really interesting projects on his channel and everything really well explained. Definitely 10 out of 10 and gets my vote. :-+
Dubbie:
It’s enjoyable seeing the design process blow by blow, and also seeing the improvements he makes throughout the versions.
I can’t even imagine how excited I would have been to have resources like this when I was a kid. It’s better than university in its own limited scope.
Inverted18650:
I built V7 and can tell you without a doubt, you can by-pass both the fuse and diodes. But why? The calibration of the unit is done by adjusting the voltage at the base of R6 and dialing in the "sense" voltage on the input
the cost was about $145 for 90W unit. Its very simple to recreate as he has literally done all the work.
I have since torn the unit back down address the issues I found. I am working to push the unit up to 500W. I have had two successful runs at 200W for three hours each (using standalone cooling) but need to finish the PCB layout. I moved the sense resistor, temp sensor, and changed out the fan drive tranny/diode combo.
I still have a couple of his original V7 PCBs, that I had made, if you want one. He says I should not have had them made and waited for his double-sided layout but wasn't upset, just didn't like the links in the layout and wanted only "DIY" types to make their own.. Since he didn't release anything but PDF's this time, I think he wants to "guard" it a bit more this go around. He is now more interested in selling them which is cool, he has earned it, it is a cool project.
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