Okay, seems the part of the circuit of interest, doesn't actually work. From the Instructables article:
"The other problem was that MOSFET Q1 ( in V-3.0) conduct even when there is no solar input."
Identical 'protective' mechanisms appears in a number of similar solar charger projects, so...
Hey, Averagesupernova. Sorry, I thought that was the best image resolution available. Seems there's a pdf:
https://content.instructables.com/FQO/PS5A/I6B1RI4U/FQOPS5AI6B1RI4U.pdf
From a possibly abandoned project at:
https://www.instructables.com/ARDUINO-SOLAR-CHARGE-CONTROLLER-Version-30/
Ah, Thank you, Baluncore. Q1's value as a reverse polarity protection hadn't occurred to me. Okay, how it turns off during reverse polarity connection seems to make sense. Very clever.
How Q1 then turns on, depending on the gate signal through D1 is a mystery? I get that Q1 can conduct current...
Hi,
Attached is a circuit diagram for a solar powered, synchronous Buck converter. It appears to have and extra Mosfet, Q1, that is intended to prevent the flow of current, out from the battery, and back toward the unlit solar panel, via the body diode of Q2. Q2, being the regulator's high-side...
Okay, so I conduct away all the free electrons in a cube of metal, by hammering it against an earth. My conductor is now an insulator. What happens then?
...so I drop a cube of metal, and for the brief moment when it strikes the ground, there is an electrical potential measurable between the top and bottom sides? Prolly not a large one, I imagine?
I take a conductor and expose one side to a nearby region of negative charge. The metal's free electrons are repelled, and many collect at the opposite side to the charged region. High School stuff.
Okay, so now I accelerate the metal in one direction. What happens to the free electrons...do...