2019-08-26
The VPSB (Vic’s Serial and Power Board) is functional. Fucking finally! The last function to be tested was the current monitoring of the attached peripherals and I am glad to report that it works. Not flawlessly, unfortunately. I will have to replace the 0.010 ohm resistor current sense resistor with something a bit bigger on “production” boards. Going to try a 1.5 ohm in its place. With two 3 ohm resistors in parallel current sensing Read more…
2019-08-19
How do I put this … the latest revision of the board works. The only thing that I haven’t delved into I2C, but everything that I have tried so far works. Completely. Which is actually extremely rewarding, since this has been a slog for a year plus. Some previous posts to catch you up: So much failure More failure Everyone on the fail train Well all of the problems have been addressed. Vic’s Power and Read more…
2019-08-04
Finally success. FINALLY. I finally have inrush current management under control. In case a refresher is needed, here are a few posts discussing the problem. https://www.simkus.com/2017-10-01/ https://www.simkus.com/2018-07-21/ https://www.simkus.com/2018-08-24/ To recap: Attempt #1 – relay. When the relay would turn on, the power supply would dip causing havoc. Attempt #2 – PWM drive of the low side. Electrical current is like love – it finds a way. By disconnecting the low side (negative rail), the positive Read more…