WTH questions in electronics - some with answers
Now and then I ran into schematics that just plainy look wrong, so the WTH questions pop.
This page hosts them, hopefully many would get answers (if not already had).
- The capacitive soil moisture sensor from DFRobotics. - July 2016
WTH - a weird frequency to voltage converter using something that's resembles a LP-filter but has an additional diode and resistor in the circuit
Verdict: "Not going to work with the values in schematics. Also, non-linear complicated response, know well what you are doing if you go this way"