Questions tagged [potentiometer]

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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39 views

How to change resistance with buttons?

For example, instead of using a sliding, rotating knob on a potentiometer, it uses buttons to add or subtract resistance. Is this possible? Would preferably like to avoid using micro-controllers to ...
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1answer
80 views

What is the purpose of a resistor in series with a potentiometer?

I assume the 100 Ohm resistor is in series with the potentiometer so that the circuit is not shorted if the potentiometer has a value of 0 ohms, however, I know that will not affect the circuit ...
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36 views

Adding foot control to tig welder

I've got a simple tig welder that uses a switch on the torch to start the welding current and a potentiometer on the front panel to set the amperage. Many welders make use of a foot pedal to start te ...
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38 views

Problems with DRV103 PWM

I've been doing some work lately with the DRV103 IC by Texas Instruments (datasheet here, essentially it creates a PWM signal of variable duty cycle and frequency, preceded by an 'ON' signal of ...
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3answers
72 views

OP Amp 0-5 VDC Output

I have the circuit pictured below. I need to change the potentiometer from a 20K to a 5K and still get the 0-5 VDC output. VCC = 5V Is this possible? What needs to change to make this possible?...
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128 views

High Power Variable Potential Divider

I have a DC high voltage (>270V) high current (>40A) circuit which needs to power a standard LED along the way to a heater. The LED is to indicate whether or not the heater is activated. I'm ...
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90 views

How to solve electric circuits with potentiometers?

simulate this circuit – Schematic created using CircuitLab I want to solve \$I_x\$ (the lecture of the ammetter) in function of \$R_x\$ I'm doing this: $$-V_1+(R_1+R_x)I-R_{bc}I_x=0$$ $$(R_3+R_{...
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1answer
111 views

Low resistance digital potentiometer - alternatives?

I've done quite a bit of searching online and can't find a solution to this (probably trivial!) problem: I am looking to replace a resistive fuel level sensor in a car, with a solution which can be ...
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33 views

Fixing or finding a replacement for a Potentiometer

I am trying to do a little home repair on an older set of CH Pro Rudder Pedals. These are a 3-axis USB game controller, and I have isolated the problem to one of the potentiometers in the right break ...
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2answers
91 views

Unusual potentiometer pin configuration

I'm trying to identify this 30 year old ø24mm 10k log potentiometer so that I can replace it. The only marks on the rear are "RC-302" and "1348616" but that doesn't turn up anything in my searches so ...
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128 views

Why is this potentiometer and comparator circuit not working?

I'm quite new to electronics and I'm afraid I'm missing some basic knowledge. (also please forgive me if I'm not always using the right terminology) I'm trying to use a potentiometer (R1 in the ...
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59 views

How to make a non-linear potmeter more linear

I have an "Expression pedal" that worked fine on my old keyboard (Gem WX2+) but works almost like a digital switch on my new keyboard (Roland VR-09). The recommended expression pedal is a Roland EV-5 ...
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2answers
63 views

Can a trim-pot wiper or contact point gets oxidized over time?

Can a trim-pot wiper or contact point gets oxidized over time? For example when a potential (high) current is flowing and the contact point of the wiper on the resistive element heats up a little. I ...
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2answers
86 views

What resistance is required to drop 12v 11A DC to compleate 0v? [closed]

Let's not lie. I'm a big fan of LEDs. I have about a meter long strip (3.2W) plugged to a computer power supply through connector capable of supplying 12V and 11A. I was about to buy a 10k Ohm ...
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1answer
84 views

Modifying El Wire driver for Brightness control

I have an El-Driver that has a potentiometer to control the brightness. I would like to control the brightness with an Arduino, replacing the potentiometer. Here is the schematic of the brightness ...
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1answer
107 views

How do I use a switch without current running through it?

So there have been plenty of occasions where I would like to use a switch or even potentiometer in simple circuits I make (just little at home hobbyist creations). But alot of the switches I try to ...
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53 views

Best conductive ink mixture for potentiometers

Im 3d printing a model for a 2 axis potentiometer, and I need a carbon ink mixture that will hold up to the copper wiper, and produce around 10kOhm resistance in a line around 1mm*6mm. Searching ...
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68 views

Potentiometer Working

Let's suppose that \$E \gt V\$. Now, the voltage \$V_b\$ at point \$b\$ will always be \$V\$ and will not depend on \$E\$. Similarly the voltage \$V_A\$ at point \$A\$ is \$V_E\$ which will be ...
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91 views

How to dynamically adjust voltage divider (90V) using a 3.3v microcontroller

I have a power supply that regulates its output by turning a potentiometer. It supplies the full 90V to the two leads of a 200k potentiometer. By sending a voltage in-between 12-90V to the wiper input ...
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1answer
41 views

Baxandall tone circuit passes signal through but does not alter its tone

I added an Baxandall active tone circuit to an existing overdrive circuit and I'm having an issue. The signal passes through the circuit/opamp and out to my volume control but the bass and treble ...
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8k views

This LM317 diagram doesn't make any sense to me

So this is the basic wiring for an LM317 as a voltage regulator, and very little of it makes sense to me. First off, if one pin is for my adjustment, why do I need \$R_1\$? \$R_2\$ will give me just ...
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1answer
107 views

Controlling the current through multiple LEDs linearily and efficiently

I have around 100 infrared LEDs, each with an adjacent phototransistor to detect small differences in the distance of several objects (QRE1113). As the objects materials differ, I want to be able to ...
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1answer
29 views

Sharing the Load: Power Ratings

I have some cheap potentiometers that I would like to use as variable resistors. The potentiometers have a power rating lower than the amount of power I would like to be able to dissipate across the ...
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2answers
74 views

Will this circuit work? Using USB extension on a potentiometer

I have the following circuit. It is a simple Arduino project to read analog data from a potentiometer 10K. Click here for video link if you're curious. The circuit shown above is tested and working ...
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46 views

Identify an ALPS potentiometer

This potentiometer reads between 0 and 115K as I rotate the shaft. The wedged part of the shaft is 10mm. Can anyone identify the part number?
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79 views

ATMega328P control servo motor speed with potentiometer

I'm trying to develop an application in atmel studio 7.0 which will allow me to control the speed of my servo motor with my potentiometer. Now, the problem is that I don't really know how to do that? ...
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1answer
93 views

Solder joint only working while solder is still liquid

I am wiring an electric guitar. Part of the wiring process is a tone capacitor (0.022 µF) which is attached to a linear taper potentiometer, when the potentiometer is turned, the capacitor is ...
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1answer
77 views

How to identify specs of guitar pots and capacitors?

I have a 1986 Gibson Les Paul Custom. Looking into the control cavity, I see that all four potentiometers are stamped R1378511. The two tone pots also have the code 71-079 stamped on them. I cannot ...
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55 views

PC Racing Pedals

I have very limited knowledge of electrical engineering and mechanics (I'm hoping to learn) so please forgive me if this is a stupid/noobish question. I've been thinking about making a steering wheel ...
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3answers
105 views

LED brightness stability issues - how to fix?

I am performing an imaging experiment in which LED stability is critical. I use 2-3 red LEDs to illuminate a surface while imaging that surface. In each LED circuit, I use a constant-voltage ...
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3answers
69 views

Implementing digital control on analog potentiometer [closed]

I have an analog sound processor unit, which uses either ICs or spare components. There are four controls, which are simple potentiometers. I would like to control their levels digitally, storing the ...
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2answers
190 views

Gain of Non-Inverting Amplifier Does Not vary with Resistor Values

I am trying to build a non-inverting amplifier using a LM7171 op amp, and I am implementing it with potentiometers as Rf and R2 so that I can smoothly control the gain of the amplifier (and easily ...
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2answers
59 views

Measuring variable resistance as voltage value

I would like to replace the microcontroller of an old gamepad with a Arduino/Teensy board. To do this, I need to connect all buttons and the output of the 4 potentiometers of the gamepad's joysticks ...
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2answers
55 views

How to read potentiometer value in existing circuit

I built a circuit for heater controller and it works fine. I want to read poentiometer R3 values with microcontroller Arduino. I am not sure if I am doing correct way, but I connected Arduino analog ...
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1answer
29 views

Resistance/Voltage relation in Rheostat?

According to "How Computers Work" (Tenth Edition) by Ron White, he features a graphic of a potentiometer with three terminals on the bottom with the one on the left being for current flowing in and ...
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14 views

Low range of voltage from a potentiometer connected to Toolstick card Silicon Labs

I have a linear potentiometer of 10k ohms which I connected to a toolstick Card (a microcontroller distributed by Silicon Labs). I used the ADC of the card to convert the analog voltage to digital ...
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25 views

How to wire 4 pin slide potentiometer? [duplicate]

I was wondering how to wire a 4 pin slide potentiometer. I found this previous question but was wondering what the numbers actually meant: Potentiometer with four pins?.
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2answers
48 views

potentiometer like rotation angle sensor

I have a set of flight simulator gauges which use a motor to move various indicators. The rotary position of the indicator is measured with a potentiometer like device, but it has 5 terminals instead ...
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1answer
81 views

Digital potentiometer - different voltage

What would be the "correct" way to replace an analogue potentiometer with a microcontroller controlled digitalpotentiometer, when the require voltage is higher than what the chip can support? In more ...
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2answers
86 views

electronic dc voltage regulator controlled by arduino

i am new to the electronic things so please help me figure out a solution. I am looking for a way to control voltage by Arduino of my 60volt 10 amp dc power supply i.e to get any voltage from 0 to 60 ...
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30 views

Current Controlled Potentiometer

The core problem I am having is that I need to be able to control a DC to DC voltage regulator based on input from a 4 to 20 mA signal. The end goal is to have the output voltage of this regulator be ...
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4answers
132 views

Potentiometer warm up issue

I have a microcentrifuge which has a DC motor rated 24V, 10 Watt and 7000 rpm. I have attached one 5W, 500 Ohm potentiometer with it to control the speed and it works fine without heating up. ...
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2answers
2k views

Potentiometer like component

Okay you might get this a lot around here; I'm trying to figure out the inner workings of this specific potentiometer like component. I want to get my hands on the datasheet or a similar components ...
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2answers
152 views

Steps to replace a 10k ohm pot with a 10 ohm pot

I was about to build an all-in-one board for a retropie computer inside a gameboy advance sp shell, when I found this board that already was made and shared by someone else. I have a different ...
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1answer
56 views

Potentiometer/trimpot range 503 vs 103 with a resistor in series

Small intro: I'm adapting this NE555+CD4017 module to fit into a nice little box and I am switching out the plastic trimpot that came with the package for a metal one that can fit through wood. The ...
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2answers
236 views

Potentiometer overheating

I have a 10 kilohm potentiometer being powered by a twelve volt battery. After I run the circuit, the potentiometer begins to overheat. I thought that a 10 kilohm potentiometer could take 12 volts. ...
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1answer
56 views

How to add a Linear and Logarithmic Potentiometer in Circuit Wizard

I'm new in this kind of thing and I'm using Circuit Wizard (Circuit Simulation Software). I was trying to simulate an overdrive pedal circuit (https://www.instructables.com/id/Overdrive-Pedal/) in ...
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47 views

Does potentiometer accuracy change with degree of movement?

I want to use a conductive plastic potentiometer for my actuator application where movement is +/- 40 degrees. As in datasheet, the potentiometer linearity is given as +/-0.2 % which I think is for ...
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66 views

Equivalent replacement for a centered 4pin potentiometer? [duplicate]

I need some help in understanding the pots pictured above. How does this 4pin pot work? What is the function of the 4th pin? Would this be the correct replacement if I want to replace the centered ...
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2answers
99 views

How do I connect a four way key in a potentiometer?

I asked this question in Physics stack exchange and had an answer, but I couldn't understand it well. A comment said this stack exchange was a better fit for the question. Question: How do I connect ...