mechanically-adjustable special-type variable resistor with 3 legs and it is used as a potential-divider. (It is not a meter at-all, but got the name from its historical ancestor which was a meter.)

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16 views

Resolver plus potentiometer VS Encoder [on hold]

Resolver and potentiometer are present in my drive. Now I want to replace with absolute encoder instead of resolver. Is it required to use potentiometer again to find the limit or Is it possible to ...
0
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0answers
62 views

Audio POT with FET and PWM

I've been trying to build a simple audio pot to be controlled with PWM with an arduino, but I'm not sure why it doesn't work. I could do it with a LED (not directly which is simple, but with a FET), ...
0
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1answer
50 views

Unable to make a pot work correctly

I have a board I salvaged from a joystick that uses potentiometers to measure the location of the arms. On the PCB a edge pin and the center pin are wired together. I would like to connect the pots to ...
2
votes
2answers
45 views

How to by-pass non-functioning 4-post volume pot [closed]

I have an old AT&T Tel. answering device that I would like to keep going as long as possible. However, the volume pot is absolutely shot after trying to service/clean many times. I haven't been ...
0
votes
3answers
78 views

Convert PWM to Analog using a DAC chip in order to emulate a Potentiometer for audio

I'm trying to control audio level/gain (from line or amplified signal) using an Arduino. I do not want to use SPI, for this project I can only use the PWM outputs, thus I do not want to use a digital ...
0
votes
4answers
90 views

How does electric current flow through a potentiometer?

I'm very new to electronics so I'm still grasping some of the fundamentals. I'm trying to figure out exactly how a potentiometer works and how the current flows through a circuit with a potentiometer ...
0
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1answer
50 views

How to pick resistor values for voltage range with potentiometer

How do I pick resistors for a 12v-30v boost circuit using an SDB628 IC; Vout= 0.6(1+R1/R2). I am using a 50k pot for R1. How do I get that 12v-30v output voltage range? To get 30V, my calculation of ...
0
votes
1answer
41 views

Calculate base resistor of PNP transistor in switching circuit with variable resistance

I would like to read analog input on my Raspberry Pi using various resistive sensors I represent in the schematic below as potentiometers (R5 ad R7). I need to be able to switch the circuits on and ...
1
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1answer
39 views

Potentiometer “US 250KA” same as 250k?

I want to replace the potentiometers in my electrical bass due to scratching. All three of them (volume of pickup 1, volume 2, tone) are of the same kind, "US 250KA" single-turn (no push/pull). Is ...
1
vote
1answer
20 views

Rotary Sensor Potentiometer SP280X series

I have a novatechnik rotary sensor potentiometer SP2801 100 002 001.Th datasheet shows that it has a maximum electrical angle of 100 degree.But I saw that we can move the pot in any direction any ...
0
votes
3answers
79 views

decrease 32V 3A DC voltage to 28V 3A

I am now building a power supply for a 100W LED light. Right now I already got 32V DC from my DIY Power Supply, with 3A current. I try to enable my PS to dim the light by regulate the voltage to the ...
5
votes
2answers
409 views

What's a potentiometer with four terminals in this schematic?

I'm reading the datasheet for a TDA2005 IC. In it, there's a application circuit schematic with two potentiometers that have a fourth terminal in it. See below: The components I'm talking about is ...
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0answers
43 views

Constructing a new wiper for a slide potentiometer

I have some old slide potentiometers which have missing wipers. Replacing them with new potentiometers is not really an option as they belong to some vintage gear. What is the best way to construct ...
3
votes
4answers
264 views

The potentiometer used in electronics is not a measuring instrument. Why it is called a meter?

Why this kind of variable resistor is called a "meter", when it is not a measuring instrument? I have seen another instrument of same name. In our school physics lab, there was a big rectangular, ...
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2answers
54 views

Wiring a membrane potentiometer to give two outputs

I'm using a softpot membrane potentiometer in a project and I have found that pressing two fingers on the strip gives strange results. I was expecting it to short to the lower resistance value but in ...
0
votes
1answer
55 views

Why is using a potentimeter as a rheostat treated different way than a resistor?

This might sound a bit weird question but I’m having some confusion regarding some fundamentals on potentiometers used as rheostats. Here I will try to explain by using the simple circuit below: ...
2
votes
4answers
87 views

A question on using potentiometer as a variable resistor

I have a 10k poti. I use it as a variable resistor by soldering two of the three terminals. It is connected to a 1/4 watt 220 ohm resistor in series(this is the load). The voltage across this circuit ...
0
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2answers
183 views

Is my 600W boost broken or malfunctioning?

I'm asking this mainly as a sanity check and to distinguish between whether I've just done something wrong or need to buy a new one. I have a "600W" boost converter based on the UC3842A SMPS w/ CC ...
0
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1answer
72 views

How to use an 2-axis accelerometer as a potentiometer? [closed]

I've got a couple of Memsic 2125 accelerometers around and wanted to try to use one of them to replace a pair of potentiometers in a circuit (x axis replaces pot A, y axis replaces pot B). How would ...
0
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2answers
64 views

Measuring a potentiometer with noisy power

I need to measure a potentiometer where the voltage supplied is very noisy and cannot be filtered. I run into this a lot in my work, but currently I'm trying to measure a steering angle potentiometer ...
0
votes
3answers
219 views

Why can't I vary the speed of a dc motor with only a potentiometer?

I made a simple circuit with a 9 volt battery, a dc motor, and a potentiometer. The positive of the battery is connected to one side of the potentiometer and the negative to the other. One side of the ...
-2
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1answer
37 views

Improving the linearity of a potentiometer after loading

I could not understand why is adding 'Rlin' in the second figure improves the linearity of the system? A little help pls!
-2
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2answers
92 views

Electrically loaded resistive Potentiometer!

According to my course book, Potentiometers produce a linear output as a function of displacement, provided that the potentiometer is not electrically loaded!, what is electrically loaded???, mean in ...
0
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1answer
31 views

Resistive ribbon sensor multiple readings

I created a resistive ribbon sensor using a resistive strip as follows: When making contact between A0 and the resistive ribbon (e.g. at the location of the red circle) using a bridge, I can ...
1
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4answers
139 views

Is there a potentiometer model for LTspice?

I started designing a model for a three-terminal potentiometer in LTspice, since none are included and it's such a common component. Drawing the .asy symbol and the wiper terminal, it dawned on me ...
0
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2answers
31 views

Why there is continuous variation in output frequency of a Hitachi Inverter (L100 Series)? [closed]

I am using a Hitachi L100 Series inverter and its frequency source is Keypad Potentiometer. During run it is continuously changing the output frequency which is displayed on the Operator Display ...
1
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3answers
73 views

Replace a 500Kohm potentiometer with a digital one

In layman's terms, I want to replace a Commodore 64 Paddle controller with a programable one. I thought that the best approach is to replace the manual ~500k ohm pot used by the paddle with a ...
0
votes
0answers
34 views

Building Guitar Pedal, but tone pot is not doing anything

Alright, so I'm building a guitar pedal (below you'll see my schematic) and I switched out the tone pot and the volume pot so that I could use a different knob (I know, dumb reason). But the tone pot ...
1
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2answers
94 views

How to create a linear current response from a passive pot circuit?

I am wanting to linearise the current response of a circuit which currently has the resistance change from a linear pot. I have a current input that I want to test using a test jig/simulator. The ...
0
votes
2answers
32 views

Prevent Exceeding of Potentiometer Power Rating

I am using a 10k digital potentiometer to adjust the brightness of an LED. However, I need to make sure that when I reduce the resistance on the pot, it will not exceed the maximum power ratings. The ...
0
votes
1answer
61 views

How can I build a dual potentiometer?

I am about to build a wien bridge oscillator circuit which is shown in the figure below: However, I need a dual potentiometer to do so, because the resistors VR1a and VR1b must have the same value ...
0
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2answers
127 views

Can a single potentiometer be hooked up to multiple fans to control their speed?

I have recently learned about potentiometers and their "variable resistance" porperty. I am looking to hook up a Potentiometer in order to control 4 12VDC Fans. I am not sure if that is a good idea, ...
0
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0answers
45 views

How to correctly control contrast on a JHD202C LCD display

I have a JHD202C LCD display, for which the datasheet is available here. Please note that there are more than three pages in the PDF file, one must download it to see them. TL;DR: Which of the two ...
0
votes
3answers
83 views

Burned out potentiometer

DISCLAIMER: I am just tinkering with electrical engineering and can barely do the basics yet. Background I have done a little work on a breadboard connected to my Raspberry Pi, but today I wanted to ...
1
vote
1answer
89 views

PWM or Variable Resistor [closed]

For a school project, I have to design and perform an experiment of my choice. I have chosen to test the efficiency of variable resistors and PWM circuits by testing the amount of energy wasted (heat ...
0
votes
1answer
43 views

Selecting potentiometer for adjusting Vo in DC-DC step down

I am trying to figure out the correct value of a potentiomenter for trimming Vo in a step-down DC/DC converter. I am using a 150W 12V output DC/DC from murata. From the datasheet, equations are given ...
0
votes
1answer
72 views

How to control the speed of rotation of a servo using a potentiometer?

I'm trying to write a program using BASIC to turn a servo 180 degrees back and forth, and to use a potentiometer to control the speed at which the servo turns. I have a code, but when I run it, the ...
0
votes
3answers
65 views

How does potentiometer influence incoming current in the circuit?

As you can see from the picture, shouldn't the 100 Ohms be the only current influencing factor at whatever the voltage it is supplying? How does Potentiometer on the right side cause decrease in ...
0
votes
2answers
86 views

Amplifier volume potentiometer causes voltage offset

Using answer about microphone I have built a simple amplifier. simulate this circuit – Schematic created using CircuitLab I changed some of the parts due to my needs and resources. R1: ...
1
vote
1answer
115 views

100k linear potentiometer with arduino

Is it OK if I use 100K linear potentiometers to input values to Arduino? The documentation specifies 10K should be used and I suppose that would translate to 0.5mA power consumption which would be ...
10
votes
1answer
509 views

Potentiometer vs Varistor

What is the main difference between and potentiometer, rheostat and a varistor? And how do the application of the three in a circuit differ? Or to be more concise, in a variable power supply why ...
1
vote
1answer
141 views

4-20mA Potentiometer to arduino questions

I've recently been messing around with the arduino uno and potentiometers. I got a potentiometer from where I work but im not sure how I should hook it up so I don't mess anything up! There are 3 ...
1
vote
1answer
63 views

help for timelapse slider motor circuit

I need some help designing a circuit for a timelapse slider. Please bear in mind i am a beginner with electronics, so have mercy! The motor will be pulling a trolley (very slowly) along a set of ...
0
votes
2answers
123 views

How to vary the voltage of a battery

Essentially, what I need to do is vary the output voltage of a battery between say 2V - 5V. This is to mimic the voltage output properties of a solar panel under different sunlight intensities. The ...
0
votes
1answer
80 views

Upgraded 10 turn potentiometers don't work whereas the original 1 turn potentiometers do. Why?

I bought this adjustable power supply kit and successfully assembled it. I wanted to upgrade the potentiometers to 10 turns so I could have fine control over the current and voltage limits set. Both ...
0
votes
1answer
51 views

Constructing an MCU controllable resistor

I need a resistor that I can control with an MCU like an arduino/raspberry pi. Ideally with 1M max resistance. The resistor will handle an analog signal range of \$\pm\ 9v\$. I've considered using a ...
0
votes
2answers
69 views

Audio Taper to Linear Potentiometer

I'm trying to linearize the output of an audio tapered potentiometer. Right now, I'm using ADC on a Beaglebone to read the value of a 250k potentiometer with 3.3V. I get a value between 0 and 1, but ...
0
votes
0answers
40 views

Spice-Potentimoter Plot… How to plot output voltage vs wiper position

Determine and graph a relationship between the output voltage and the potentiometer wiper position, which corresponds to the distance y. Assume that y changes from zero to 1 (for the top position of ...
0
votes
2answers
51 views

DC High Voltage Line Splitting Problem (Electrode “Tuning” Application)

I am having trouble coming up with a solution to a problem engineering a DC circuit that can take a single line input (Vin) and split into two outputs (Vout1 & Vout2). The goal of the circuit is ...
0
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2answers
96 views

audio-taper potentiometer in 50-100 ohm range [closed]

Anyone know where to source an audio or logarithmic taper potentiometer in the 50 or 100'ish ohm range ? Mouser and Digikey don't show anything, even non-stocked. I'd like to build an adjustable ...