Since the last installment, I've finalized the initial PCB design and sent it off to Seeedstudio for fabrication. I've never designed a through-hole (TH) construction board before but in general all the same rules apply to SMD and TH boards I believe.
|200W 0.1Ω load|
|30W 1Ω load|
10x10Ω 3W in ||
|Basic MOSFET operating voltage graph|
In addition to these admittedly minor hardware revisions I also created the previously posted rotary encoder library so I could have both fine and course control over the output current. Might as well take full advantage of the digital circuitry, right?
The two holes labeled "LOAD" top center of the PCB rendering below are points you can use to measure the voltage across the load. That number, with a little basic Ohm's Law calculus, will tell you the current going through your load. It will be a useful point to pull data for an analog panel meter. The boards should be here within a couple weeks and then I'll build a couple up and post them up. I'll also bring one to Freeside to put on the shelf. It's always handy to have a precision load when doing electronics work.
|I added the Freeside logo in copper on the top of the board.|
It will be interesting to see how that looks in real life.