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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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55 views

Potentiometer for TL081

What kind of potentiometer (resistance) would be suitable to connect to the Offset pins on the TL081 Op amp, when used with +/-15V? And if I choose to omit the pot altogether, roughly speaking, how ...
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2answers
36 views

Automated equivalents of Potentiometers

I am currently working on a project to create an amplifier which can use both physical and digital inputs to change the resistance of a potentiometer. Is this possible without using sliders? I know ...
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1answer
26 views

Can I use X9C102 digitally controlled potentiometer on AC voltage?

I am working on a project to make a dimmer using the triac and a photocoupler, and I want to know if I can use a digital potentiometer to regulate the intensity of the light. I know it works for ...
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1answer
46 views

LM317HV power supply

I have a few questions regarding the following schematics: ![/imga] ![/imgb] Initially I was testing the first schematic to see if it works good. The result of the tests were good, the power supply ...
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1answer
37 views

Why is the potentiometer setup in this configuration in this 555 circuit

I just started learning about chips and signals using the book Make: Electronics, in one of the circuits, used to generate a pulse in Monostable mode a potentiometer is used to vary the pulse length....
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2answers
104 views

Two potentiometers to control the range limits of a voltage source

I would like to control the range of an input voltage source using two potentiometers to establish the limits of the signal. First pot determines limit 1 and second pot determines limit 2. Lets say, ...
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3answers
66 views

Potentiometer position with op-amp

I would like to measure a 10k ohms linear potentiometer (position) with A/D converter using an op-amp like this : In my case V+ will be 3,3 volts and Vout need to have maximum of 2,5 volts (which is ...
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2answers
67 views

Won't a potentiometer powered by a dc supply cause a short-circuit at lower end of the range?

Many tutorials in the Arduino or Raspberry Pi community simulate an analog sensor with a potentiometer. The potentiometer, being a passive device, is powered from the same DC power source that ...
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2answers
177 views

LED Circuit design (4 switches, 1 potentiometer)

I need to design an LED circuit that acts as a switching system. It must meet these specifications. Case 1(Press Button 1): LED 1 ON, LED 2 ON, LED 3 OFF Case 2(Press Button 2): LED 1 ON, LED 2 OFF,...
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1answer
31 views

Bourns PSL Snap-In Connector?

I want to build a small console with the Bourns PSL slide potentiometers (nothing big, it's a just-for-fun project). Unfortunately, I couldn't find the right connector on their website. The datasheet ...
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1answer
93 views

Replicating 0-5k resistance signal

I am trying to essentially replace the accelerator pedal position sensor of an electric car. It's a 0-5k potentiometer type throttle. I have tried using digital potentiometers - MCP41010, 2 in ...
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1answer
65 views

Is there a wrong way to wire a potentiometer?

I'm using Circuit Wizard to simulate a circuit and I'm trying to understand how to wire a potentiometer. While trying to learn how current flows through the pot, I found that it works in both ...
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2answers
94 views

Why is my LED flickering when it is connected to a variable resistor, and it's resistance is at the minimum value

I am doing a simple breadboard circuit, with an LED, 3.3V power supply (a microcontroller connected to the PC will be the voltage source), a potentiometer, and a Voltmeter connected across the LED. ...
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1answer
84 views

How to control LED brightness with mosfet as switch and potentiometer

I am designing a circuit to control a high current LED string. Most of the time the led string will be ON. Where should I place a potentiometer to control the brightness of the LED when it is on by ...
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1answer
51 views

Adding a volume control for headphones, driven by microcontroller

I'm currently driving a pair of earbuds with this circuit: P0 is directly connected to a 3.3V microcontroller pin, which is using PWM to drive it. I "stole" this filter circuit from the upper left ...
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0answers
80 views

Digital Potentiometer behaves completely differently from the original analog one

I have a guitar pedal which basically is an analog echo/delay audio effect (MXR Carbon Copy). The circuit diagram is presented below. It has 50K B analog potentiometer that controls the delay time. ...
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2answers
65 views

LED Driver Choosing help

Newbie here, I am working on a project with a panel of 12 - 15 LEDs(std 5mm through hole LEDs) in paralell. I am currently using a 5V 1A SMPS. I used 330 Ohm resistors for current limiting. It works ...
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1answer
69 views

12V potentiometer

I am trying to control the power of a vacuum pump using a 10k potentiometer with 12v as its input source. I've tried wiring it (with the know facing you)with the first lead as ground, second one being ...
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2answers
184 views

Bypassing a potentiometer

In the schematic taken from a device's service manual, if I want to bypass this volume knob and make it 100% all the time, which pins should I connect and how? I have read online, prior to seeing the ...
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1answer
64 views

Potentiometer is Heating [closed]

I have this light dimmer circuit, when I plug it into the AC, the dimmer works fine but I noticed that the heat in potentiometer is increasing, is there any workaround to fix this problem?
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1answer
31 views

Can you use a 3ph BLDC controller without a potentiometer?

I'm attempting to build a 12v fan and I'm looking at controllers to drive the 3 phases of the motor. It seems every ESC i find has a potentiometer included. I want my fan to always run at full speed ...
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1answer
105 views

Correct wiring of a variable resistor

I built the following schematic and I made a mistake. I wired the 4.7M preset reversed. This is the original schematic: And this is the schematic that I drew in Kicad: I already built the PCB but ...
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0answers
54 views

Low-Pass Filter Selection and Placement in Active Noise Cancellation

This continues in the same vein as my previous question - I'm working on an Active Noise Cancellation circuit to get rid of highway noises in my bedroom. Based off an ANC circuit pictured below, I ...
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2answers
68 views

Does anyone know the name of this specific part?

I bought these 10K linear faders some time ago and would like to use them in a current project. The only problem is that I don't know what they are so I can't order more / find the datasheet! My ...
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0answers
28 views

Nth-Light Narrow LED, Linear Potentiometer and 12VDC power supply

Is it possible to connect Nth-Light Narrow LED Flexible Strip Light (https://www.adafruit.com/product/3683) directly to a 12VDC power supply and 10K Ohm Sliding Linear Potentiometer to control the ...
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1answer
83 views

Log-Taper Variable Resistor from Linear-Taper

I'll start by saying: I've read quite a bit about how to make a "log taper potentiometer" using a resistor and linear-taper potentiometer, but I'm not sure if that will work in my case. I'm working ...
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1answer
100 views

Testing regulated power supply: 100 mA current sink

Disclaimer: I'm trying to learn about circuits on my own. I'm reading as much as possible to avoid any basic mistakes, but if there's any, please point it out and I'll investigate further in that ...
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1answer
40 views

EHX LPB1 circuit not working

I am very new to making circuits and have tried to make an EHX LPB1 circuit: When powered and plugged in, the 9v battery overheats and all I can hear in my amplifier is static noises and no output. ...
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1answer
76 views

Potentiometers - trimming a potentiometer

I'm trying to use two trimpots to set the low and high point of a seperate 16mm pot. I have two trim pots with the outer legs in parallel to each other, and then have the middle pins going to the ...
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1answer
93 views

Deducing the value of a variable resistor in configurable voltage divider

Two variable resistors (RS & RE) and one static resistor (RC) are connected to a high impedance input analog input pin of a micro-controller. The static resistor is connected to ground and the two ...
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1answer
65 views

Sunn Beta Lead 30k s curve pot

I am restoring a Sunn Beta Lead amp and I need to replace one of the pots on the reverb channel. According to the schematics it’s a 30k s curve 4 pin pot. I can’t seem to find a replacement. Anyone ...
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1answer
47 views

Using potentiometer in two separate circuits [closed]

I am building a circuit with Arduino to control the motion of a stepper motor. I want to use my guitar amp potentiometers to feed voltages back into the Arduino without disassembling the original ...
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3answers
518 views

Floating voltage-controlled resistor with LM13700: How does it work?

1. The LM13700 The LM13700 is an Operational Transconductance Amplifier (https://en.wikipedia.org/wiki/Operational_transconductance_amplifier) converting a differential voltage into a current output. ...
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1answer
42 views

Servo motor driver - 12V to 0~10v

I have a servo motor and it's driver I wired up everything and it's almost working. The driver generate a 12V signal and I control the motor with 0~10V analog command. I started from the point 5mA ...
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0answers
68 views

Quality of potentiometers in a gamepad

I have used quite a lot of knock off gamepads, and pretty much all of them have problems with their analogs. Generally potentiometer range is so small (which makes them super sensitive), analog sticks ...
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1answer
109 views

Understanding how current is 0A in secondary circuit of this potentiometer - misprint, or am I dumb?

I'm learning some basic electronics, and I'm using an old textbook (Basic Electronics for Scientists, Brophy, 1966) to wrap my head around some fundamentals. At the moment, I'm looking at ...
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2answers
249 views

Can I manually turn a servo by hand and then record the rotation for a response with arduino?

Looking to try and use a servo to increase resistance as it is turned.
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2answers
47 views

“mapping voltage” on an analog potentiometer using a voltage divider

I'm working on a simple project to learn electrical circuits. I built a little sound box that will play tones when you press buttons. The battery provides 3volts and the "power boost" is a buck ...
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0answers
35 views

Changing power sources with a potentiometer

I have a device that runs on 5V, 2A via a micro-usb port. I also have 2 methods of powering this device - from a 5000mAh battery pack, and from a wall socket to usb transformer/adaptor. Both output 5V,...
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2answers
97 views

Potentiometer on max. resistance at lowest setting (off)

first question ever here: I'm struggling with a 10K log potentiometer in an EQ. When at lowest CCW setting it's the same value as on full CW pos. Is this typical when a pot goes bad or is that ...
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3answers
106 views

How to align components for front panels

I am struggling with the front panel setup. I need to align 3 types of components: push-buttons, potentimeters and 5mm leds. The potentiometers have a nut to fasten it to the front-panel, for the ...
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1answer
58 views

What is the proper way to dim LED pods?

I am trying to properly wire and then dim Cree LED tri-pods (3 LEDs on a disk). The spec sheet appears to read that the way to connect 2 * tri-LED pods (6 individual LEDs in total) would be in series,...
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2answers
84 views

Why do most rotary potentiometers have an opening?

Is this opening not a bad thing because dust can get in? I'm thinking about putting a piece of tape on it.
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3answers
448 views

Determining potentiometer sensor output resistance with parallel resistor

The data I'm trying to understand a sensor circuit I've come across, which I've simplified to the following: simulate this circuit – Schematic created using CircuitLab In short, it's a ...
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1answer
42 views

SMD-Potentiometer question about Datasheet

I am a bit confused about this Potentiometer-Datasheet. http://www.bourns.com/docs/Product-Datasheets/PVG3.pdf Am I right, that the resistance-range is only +-20% of the resistor value? For example,...
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1answer
69 views

Fan voltage fluctuating with potentiometer [duplicate]

I am driving a two side by side fans (original Xbox 360) from 20v, 4A source via a 12v regulator and a 10k trim potentiometer. The goal is simply to adjust voltage between 3v-12v, nothing I havent ...
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1answer
137 views

setting a trimpot on a power supply

I'm creating a power supply circuit to regulate the power from a 12V power source to sap flow sensors that will be installed in a tree. I have a protocol and circuit diagram I am following but am ...
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2answers
111 views

Potentiometer for two 12V/1.1A fans in parallel

I recently bought a potentiometer to regulate the speed of two 12V/1.1A DC fans in parallel, powered by a 12V source. Its specifications are the following: Resistance= 10k Ohm, MaxPower = 0.2W. Can ...
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0answers
39 views

Pressure Tolerant Rotary Potentiometer

I am looking to use a small potentiometer for servo position feedback inside an oil filled pressurized enclosure. I am unsure if the given potentiometer will operate in these conditions. I see various ...
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3answers
172 views

Help identify this 10K potentiometer?

I need to change this potentiometer that act as an encoder in a Native Instrument controller/mixer (Kontrol S5), as it has become faulty and increases values by itself at the lower end of its range... ...