Please read the description/textbox first. A video about adapting the resistance of potentiometers somewhat by soldering a fixed value resistor between the wiper and “ground” (= the other electrode).
Or soldering a fixed value resistor (in general: the same resistance value of the potentiometer) between the 2 outer electrodes of it. Same idea regards the first setup: dividing the resistance and bring it down to half.
Thus: bridging the wiper of a potentiometer of 10 K with a resistor of 10 K (better said: in the 8K2 to 12 K range) to one of the other electrodes, to change the potentiometer to a lower value, here between the wiper and (often) ground.
Or bridging a 100 K potentiometer between its outer electrodes with a resistor of 100 K to make it “in a kind of way” (watch the video) a 50 K potentiometer.
What are the effects of such a parallel resistor? And how does it effect the properties of such a potentiometer regarding its logarithmic or linear properties?
By the way: this is an electronics practice (!) demo, not all the questions are answered.
The best answer & idea to get insight is: connect an analog (read: ANALOG) Ohms meter to the “test circuit” (= watch video), turn the knob/axis of the potentiometer and study on the analog Ohms meter (via the pointer) how the potentiometer reacts when you turn the axis/knob.
That will surely show whether this solution (a parallel resistor) is usable or not. It also tells you (looking at the analog Ohms meter) whether your potentiometer still acts in a linear way, or not, or less, or still in an analog way. Thus what the effect is on turning the potentiometer axis/knob and its properties of soldering such a parallel resistor to it.
Please note: this all works in a certain “range”. You cannot change a 100 K potentiometer into a 1 K potentiometer, of course.
But you can change a 10 K potentiometer into a 5 K potentiometer, or a 500 Ohm potentiometer into a (kind of) 250 Ohm potentiometer with the help of fixed value parallel resistors. With all the showed effects in this video, of course.
Of course: sometimes this is ideal, sometimes the changes are too fierce. That depends on where the potentiometer is used in an electronic circuit and what it has to “do”. Voltage regulation? Current regulation? Protective effect regulation? Aligning audio levels? Etc. etc.
Anyway & in all cases, study the effect of such a parallel resistor on the potentiometer resistance when turning the axis/knob, looking at the same time to an analog Ohms meter. Linear and logarithmic behaviour can directly be seen when turning the axis/knob.
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