I’m not sure whether I’m posting this in the correct forum, but I thought I’d give it a shot. When pinouts aren’t indicated on schematics, is there a matter of convention indicating which pin is which? For example:
I realize this may be a stupid question, but I have found schematics that appear to use both conventions without indication as to which pin is which. This strikes me as particularly troublesome when trying to trace a schematic.
It depends on how the part was created in the first place. You probably want the resistance to increase with clockwise rotation, so you need to check that the connections are correct for that. I make sure that is the case when I create such parts and use them in designs.
Adding an arrow indicating the rotation direction for increasing resistance to the symbol can be useful, and will save having to check it each time.
Electrically, those are the same for a linear pot. Arranging it so CW is “more” and CCW is “less” (voltage, resistance, volume, whatever) is typical. If it has a log/audio taper, then there is a difference since the midpoint of the range is not the midpoint of the resistance.
I have a pot handy that has the “3” terminal marked as CW. That is to say, the wiper (terminal 2) will move toward terminal 3 when the pot is turned CW, and it will go toward terminal 1 when turned CCW.
I agree with the other posters: draw terminal on left, right, top, or bottom whichever way fits the function of the circuit.
