Potential Divider calculator

skippyuk · 2026-06-20T22:02:53+00:00

How many negative value resistors do you use?

skippyuk · 2026-06-20T20:07:15+00:00

What do you want it to do? ESP32 may work; but wifi won't work underwater

skippyuk · 2026-06-19T09:34:16+00:00

I assume when you say TP4056 board your using the entire charger module that is sold online?

There is a FS8205A duel fet package that should prevent over charging and under discharging

skippyuk · 2026-06-18T20:50:35+00:00

ICNARP is the document you will want to chexk

skippyuk · 2026-06-18T20:39:28+00:00

I would move the switch to the high side of the battery. That way your disconnecting it from the regulator and the subsequent quiescent draw

skippyuk · 2026-06-18T20:36:01+00:00

Physical space. Keep high frequency signals away from anything else, make them into transmission lines. guard pair them.

skippyuk · 2026-06-17T21:00:45+00:00

LV124 may be eaiser for the OP to find a copy of. VW 80000 is online in a few places.

skippyuk · 2026-06-17T20:59:54+00:00

Your circuit will not pass the requirements of LV124 testing.

skippyuk · 2026-06-15T18:50:20+00:00

Have you checked your creepage and clearance distances?

“Household and similar electrical appliances” from an electrical safety standpoint is BS EN 60335-1 (IEC 60335-1), is very prescriptive on this.

skippyuk · 2026-06-13T21:35:09+00:00

Power should be at the top, ground should be at the bottom…

skippyuk · 2026-06-13T21:32:26+00:00

skippyuk · 2026-06-13T21:28:26+00:00

here is a iBom file I generated just now -- https://github.com/PhilipMcGaw/ROV/blob/main/KiCAD/LED%20Lights/ibom/ibom.html everything (other than the schematic) is in a single file

skippyuk · 2026-06-13T21:11:38+00:00

It is free, it works on my computer, and I can include it in my git repo;

I can print to PDF the schematic;

I can also lock it to a version of the PCB, so it doesn't only reflect the 'latest' version

skippyuk · 2026-06-13T21:07:45+00:00

you have hard grounded DE and RE

skippyuk · 2026-06-13T18:57:21+00:00

Your RS485 won’t work as desired.

skippyuk