Hi,
For a wiring diagram, with the potentiometer pins pointing down, we label them as 1, 2, 3 from left to right.
On a schematic for a log/audio taper pot, do you also label the pins 1, 2, 3 from left to right when the wiper points down, or are the pins 1, 2, 3, with the wiper pointing up. Most of the schematic I see that have pin numbers are with the wiper pointing up equaling 1 2 3 instead of 3 2 1.
vs
For a wiring diagram, with the potentiometer pins pointing down, we label them as 1, 2, 3 from left to right.
On a schematic for a log/audio taper pot, do you also label the pins 1, 2, 3 from left to right when the wiper points down, or are the pins 1, 2, 3, with the wiper pointing up. Most of the schematic I see that have pin numbers are with the wiper pointing up equaling 1 2 3 instead of 3 2 1.
vs
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There's no real standard for numbering them, other than perhaps a default of clockwise.
If you look at the pot from the shaft side (with the terminals pointed downward),
then when the shaft is turned "up" in volume, the wiper (pin 2) goes from the left terminal (ground, pin 3)
to the right terminal (input, pin 1).
If you look at the pot from the shaft side (with the terminals pointed downward),
then when the shaft is turned "up" in volume, the wiper (pin 2) goes from the left terminal (ground, pin 3)
to the right terminal (input, pin 1).
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I added a couple of pictures Rayma.
If there's no standard, then on a tone stack using audio taper pots, how do I know which way to wire the pot? With the control set in the middle, 90% of the resistance is on one side and only 10% is on the other. It will make a big difference which one points to ground.
If there's no standard, then on a tone stack using audio taper pots, how do I know which way to wire the pot? With the control set in the middle, 90% of the resistance is on one side and only 10% is on the other. It will make a big difference which one points to ground.
To be sure, you can set the wiper at the center, and then measure the resistance from the wiper to either end.
The smaller resistance will be from the bottom terminal (which gives the lower volumes as a volume control,
and which would be grounded when used for that purpose).
The smaller resistance will be from the bottom terminal (which gives the lower volumes as a volume control,
and which would be grounded when used for that purpose).
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I believe what you are saying implies that in a schematic like this James tone stack:
TSC in the web
RB and RT both have pin 1 down even though they are oriented 180 degrees apart on the schematic?
editing to note that your numbering while facing the shaft side is the exact opposite of the picture I posted. Right?
TSC in the web
RB and RT both have pin 1 down even though they are oriented 180 degrees apart on the schematic?
editing to note that your numbering while facing the shaft side is the exact opposite of the picture I posted. Right?
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Turn it to no 1 (quiet) , centre terminal to one end terminal will be close to zero resistance, turn it to Spinal Tap 11 (very loud) centre terminal to the other end terminal will be close to zero resistance.
On your first diagram, visualizing the arc of the carbon track running between the outer pins, I suspect the image of the pot is labelled in mirror image.
On your first diagram, visualizing the arc of the carbon track running between the outer pins, I suspect the image of the pot is labelled in mirror image.
Tone stack will have linear pots.
So only difference is boost or cut in wrong direction.
If they are wired, easy to try before soldering for keeps.
If PCB, well, there is only one way to fit.
So only difference is boost or cut in wrong direction.
If they are wired, easy to try before soldering for keeps.
If PCB, well, there is only one way to fit.
This makes sense to me and is easy to figure out for volume.
Much less intuitive for me on this schematic: TSC in the web
I'm going to incorporate that in a build I'm working on, and I can't tell if I want the 10% resistance on the mid control oriented down or up on that schematic when the control is set to the middle of it's sweep.
As a guess, the bottom end (when it is used as a volume control) would be connected to the larger value capacitors,
and the top end would be connected to the smaller value capacitors.
A linear pot would have equal value capacitors on the two sides.
and the top end would be connected to the smaller value capacitors.
A linear pot would have equal value capacitors on the two sides.
Gotta laugh I guess and then try to do some math. In Mr Blencowe's tone stack, both C3 and C4 are 4700pf and he designed it with an audio taper pot.
If you play with the sweep using audio vs linear pot option in that link, this one:
TSC in the web
you'll see why he used an audio taper. You can choose the pot type next to the slider bar.
TSC in the web
you'll see why he used an audio taper. You can choose the pot type next to the slider bar.