I’ve been looking for my next project to fill in my free time and DIY stepped attenuator caught my eyes. So far, I’ve been looking at several articles and YouTube videos and here are the ones that I think the most useful.
Interesting project idea
Please keep us posted on how this goes
You can get Metal Film (or Thin Film) Resistors down to 0.1% accuracy. While you pay a bit more compared to the “standard” 1% ones, you save yourself hours fiddling about with a test setup.
2b) Alternatively, you can use several higher value resistors in parallel. Say you want 10k, so you could use 4x 40k resistors.
When using uControllers, the relay one may be easier on the hardware front.
Instead of a uController, you could also divide voltage from an analog poti via Zener Diodes (or voltage dividers) to trigger relays from there. ← I have to double check feasibility of this! (Or take that as your own puzzle )