Been working on a DC load the last few weeks. It sinks current, which is adjustable by a set voltage using a PI controller. It uses a BJT in active-mode. I've purchased the parts, including an enclosure and such, to make a nice little instrument with dual inputs. Unfortunately I don't have time to order a PCB before I head to Texas and work for Dell for an internship.
Here's a preview. Datasheet, pcb, schematic. More in-depth details will be posted at the end of the summer.
http://aquabunker.com/downloads/dc_load_preview.jpg
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