Both Paul and I have completed the Electronic Load. It has met our expectations (and specs) and I'm finding it a welcome addition to my limited electronics equipment menagerie. It turned out to be a lot more expensive than expected, nearly $200. I know that you can get a cheaper EL from China, but we had fun and learned a lot, which is difficult to put a price on.

I updated the details of this project with new target specs and price tag. We have voltage and current accuracy specified at 0.4%, which could be improved by using resistors with lower tempcos. I bought 80mR 2512 sense resistors with 50ppm/C tempco and measured about 60ppm/C drift in the current output. A simple upgrade to 25ppm/C resistors, which are not expensive, would probably yield a significant improvement in overall current accuracy. If anything changes I will update the project details.

Paul implemented CC, CV, CR, CP and a battery measurement mode. The first four measurement modes work well, with a bit of learning curve. The battery measurement mode is not yet usable for me because it will only test a single cell battery. Most of my batteries are multi-cell Lithium Polymer or Lithium Ion. Paul has contacted the author of the battery testing code and as of this date (2024-12-02) has not gotten a response.