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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2 answers
36 views

How to have a switch sensitive to a specific voltage ? (NO if v < v0)

I have a 0-10v tension from a potentiometer generated current (1), and I would like to use something like a relay to switch on/off a ...
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1 answer
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Adjustable low-pass filter with logarithmic cut-off control via potentiometer

Let's consider this simple RC low-pass filter: We can make the cut-off frequency adjustable by replacing \$R\$ with a potentiometer. But then the cut-off frequency \$f\$ is proportional to \$\frac{1}{...
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PWM using Hall-effect throttle instead of potentiometer

I have swapped a potentiometer on a PWM controller with a Hall-effect throttle pedal on a kids electric car build (I flipped the magnet in the pedal so it outputs the way the PWM is expecting). The ...
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1 answer
48 views

Finite resolution (discrete step) mechanical potentiometer

Are there mechanical potentiometers with discrete lockable stepping instead of the usual gradually variable adjustment? I need a potentiometer that would have a guarantee to stay in selected discrete ...
1 vote
1 answer
47 views

Identifying potentiometer

I have an old fan which is controlled by a switched potentiometer (see photo). Unfortunately it's become faulty so I need to replace it. It has five pins - I gather two of them are for the switching ...
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2 answers
82 views

Do I need to worry about current when using a potentiometer? [closed]

I have a 12 V, 2 A device. I need to be able to change the voltage for this device on the fly to up to 13.5 V. I am not an electrical engineer so please bear with me. From what I understand each ...
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Can a 10 kΩ potentiometer replace a 50 kΩ potentiometer on a volume control board?

I have an Onkyo A-9010 amplifier, which has a faulty potentiometer on the volume control board. Service Manual It's a 50 kΩ, linear (not sure) stereo, motor-driven potentiometer. In Hungary, where I ...
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81 views

Does this circuit have any problems?

I built this circuit for removing DC from a signal, amplifying AC, and offset it via an op-amp for sending to an ADC. AC signal amplitude is about 0 ~ 20 mV or 0 ~ 1 V. The reason the signal ranges ...
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4 votes
1 answer
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What is the name of those transparent soft plastic cases around a potentiometer's hull?

I can't find the name of those transparent soft plastic cases that one can put around a potentiometer's hull to protect them from short-circuits. Anyone?
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1 answer
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Time delay of LED dimmer circuit problem

I made a LED flip flop circuit using NPN transistor, it works pretty fine. But my problem now is I don't know how to control the on and off time delay for the LEDs using potentiometer. I tried putting ...
8 votes
5 answers
727 views

MOSFET overheating and voltage drop

I've searched on the network for days but couldn't find a solution to my problem I hope you can help me. I want to create a DC motor speed regulator using IRFZ46N as a power MOSFET and a 10k ...
1 vote
1 answer
106 views

Simulate a thermistor to fake temperature readings in heater

What I want to do Control an old heater to avoid running during hours where kWh is expensive. Bonus: Getting a more even inside temperature. How I plan to achieve this I know there is a product where ...
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1 answer
83 views

Dual potentiometer the solution?

I'm working on retrofitting '14 Lincoln MKS 14 way power heated/cooled seats into a 2002 4Runner. I have all motors & lumbar wired. Had a Eureka moment on the TED and got it working! 3 position on/...
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1 answer
41 views

Relationship between volume control position and signal voltage

Of course, it depends a lot on the taper of the volume control. I need to know how turning the volume knob affects signal voltage.
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1 answer
53 views

How do I connect potentiometers to a power supply so that I can use one to vary current and the other to vary voltage

I want to connect two potentiometers in a way that will allow me use one to vary the output voltage and the other to vary the output current, I'm getting confused about connecting this.
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1 answer
81 views

Using potentiometer to control speed and direction of electric motor rotations

I want to create a circuit that will allow me to conveniently control a 3V electric motor - specifically I want to be able to control how fast it rotates and in which direction. From usability ...
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1 answer
56 views

What size pot to control the volume of a single small 4" 16 ohm speaker that's plugged into a headphone jack of my Soundblaster card in my PC?

I have a 4" 16 ohm speaker in the overhead of my flight simulator cockpit. It will be plugged into a headphone splitter that goes to my SoundBlaster board in my PC. I would like to use this ...
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1 answer
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Potentiometer rated power and 16 LEDs

Using 5 mm through-hole LEDs, 4 in series and 4 in parallel, 3.3 V, 25 mA, 16 in total. Battery voltage is 12.9 V (car lead acid). I want to control brightness using a carbon potentiometer 15 mm dia, ...
7 votes
5 answers
3k views

Limiting potentiometer to 10% and 90%

I am new to using potentiometers and I just wanted to see if this is possible, I know you can use resisters to alter the value of the potentiometer and starting values and so forth. I have a 5 V ...
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2 answers
77 views

Smoothing potentiometer output

I am building a paddle controller for my Commodore C64. Basically all you need is a 470k (or 500k) potentiometer connected to two of the joystick wires. Internally, the C64 has capacitors through ...
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1 answer
63 views

Using a potentiometer to shift between negative outputs from either -2V and 2V

The question that I am wanting to ask is that I start off with either 5V or -5V which is reduced to -2V or 2V for my output for the potentiometer. My potentiometer has a 5k resistance and I am trying ...
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114 views

Reason behind my potentiometer getting short circuited or blasted

I was implementing a small circuit in which I used a potentiometer across the Live and neutral and after a few seconds while I was trying to operate the knob the potentiometer blasted or short-circuit....
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1 vote
1 answer
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Are these trim potentiometer measurements expected? [closed]

I am trying to replace a 2-D analog joystick assembly that no longer works, because I dropped it. The assembly looks just like the one pictured in this forum post. My question is about the trim ...
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Are these H-Bridge motor driver controller ICs capable of reading position info from potentiometer?

I'm specifically referencing two examples of H-bridge motor driver controller ICs (BD6210 and WT7901). To more fully understand and troubleshoot the circuitry of a typical exercise bike or elliptical'...
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1 vote
3 answers
87 views

Cut current below potentiometer level

I have this simple schematic where 2 LEDs are meant to be dimmed and brightened alternatively with a pot. What I would like to achieve is for the middle position, both LEDs to be off and then on each ...
1 vote
1 answer
153 views

How to dim an LED with a 10 k potentiometer?

I would like to know how to use a 10 k potentiometer with a small LED. Each time I try, the LED won't turn off completely and also it used only 20% of the potentiometer. I would like to be able to ...
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Simplistic way to split potentiometer into 2 seperate PWM signals where only one of them is active at a time

I havea simple RC transmitter and receiver and want to add in proportional controls. The transmitter and receiver send the data from 4 buttons on the sender to 4 outputs on the receiver, this all is ...
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2 answers
125 views

Variable resistor that will not 'crackle' with DC when adjusted?

When using a standard carbon potentiometer as a variable resistor it will 'crackle' if exposed to a small DC voltage. The DC is unavoidable and the circuit functions as desired except for this '...
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2 answers
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Datasheets, dimensioning questions

I have a problem reading this datasheet. This one is very weird, does 3-1.5 mean that pin is 3 mm wide, and 1.5 mm is meant to be a radius, or does it mean 1.5 mm and that that 3 means three pins? ...
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Swapping potentiometer gas pedal with hall effect ... signal voltage is the same but ECU has issues still

I’m doing a car motor swap (Nissan VQ37VHR into BWM E46) and would like to retain the OEM gas (a.k.a. accelerator) pedal. My initial investigations indicated the BMW pedal would work happily with the ...
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1 answer
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Potentiometer wiring

We currently have a potentiometer that is connected to Allen Bradley 22a-d2p3n104 to regulate speed of a motor (A). I would like to keep that connection but also need to connect the potentiometer to a ...
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1 answer
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Basic Variable Loundess Audio Amplifier

I am a beginner, looking to make an extremely basic variable loudness (gain) audio amplifier. I have a general idea of how a class A amplifier works, but I am not sure how to make one variable. This ...
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1 answer
112 views

Can you help me identify a broken potentiometer?

I have a wierd potentiometer and i have search for a couple of days now but i can´t find it. Are anyone of you familiar with this one? It´s broken so i need to replace it, and the axis trough it is ...
7 votes
3 answers
2k views

Please help identify this potentiometer

I'm seeking help in identifying this potentiometer in order to find a suitable replacement and/or to understand its pinout. It is a thumbwheel volume control from a circa 2005 external computer ...
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1 answer
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Weird values from ADS1115 chip and remote I/0 error

I am using a ADS1115 chip to read the values from a potentiometer and then transfer them to a raspberry pi zero w. I wired the potentiometers, so that on the left would be the lowest. GND - DATA - VDD....
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1 answer
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Can you replicate a Trimpot with a 555 timer?

I'm currently a senior ME major and just entered the EE world to complete project so I'm a little lost. I am building a circuit powered by an Arduino Mega Chip. The circuit is to control ...
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0 answers
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Is it safe to short signal to max in a volume control potentiometer in a video doorbell?

I have a video doorbell as in the picture below: However, I cannot hear the bell when it rings. So I opened the device to get to the control volume potentiometer. As in picture below: What I did is ...
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3 answers
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Identify rotary encoder or potentiometer?

I'd like to fix my old receiver/amplifier. It has a broken button "balance", but after opening and extracting the component I have no idea what I should buy to replace it. From my point of ...
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1 vote
1 answer
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Need help on resistor calculation

I'm currently work through an application note from Texas Instruments about building a programmable power supply. The base concept is fine and I understand it, now I'm trying to go through the ...
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2 answers
885 views

How to Wire Potentiometer Wiper

It appears as though the wipers are unwired in this schematic. Are only the far left and far right pins wired in this circuit?
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2 answers
475 views

Purpose of potentiometer ground wire

I purchased a rod potentiometer and was surprised to see it came with a 4th wire. The manufacturer said it was a ground, though the wiring diagram didn’t even mention it. What’s the purpose of a ...
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2 answers
105 views

Please teach me how to select and use a potentiometer

The situation: A 3v to 4.5v pump, a 9v battery (or a 4.5v 3xAAA holder because I could use either but currently have a 9v in my setup) - hook them up pump moves water. That's as far as I have gotten. ...
4 votes
3 answers
531 views

Faking a loudness pin for a standard volume potentiometer

Older amplifiers often employed a volume pot that had a 4th "loudness" pin (which I take it varied with volume up until 40% give or take after which it was fixed). Unfortunately, newer ...
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Slider operating force range

I'm reading the datasheet of PTB0153-2010BPB103. It states: ...
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1 answer
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how to functionally ground a potentiometer?

I live on the top floor of an apartment building with an extremely loud buzzer that anyone on the street can access day or night - and they do. I hacked into the apartment intercom station to install ...
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1 answer
82 views

Need help with potentiometer for DIY magnetic stirrer

I am looking to make a DIY magnetic stirrer for cleaning 3D printed resin models. In principle, the setup is not very complex; a motor, potentiometer, power supply. The problem is I am a novice when ...
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Rheostat circuit help

How much can I actually vary with this rheostat and what resistance value should I make it to get precise control of the RPM of the motor- maybe control in +100RPM by varying resistance and then ...
1 vote
1 answer
214 views

6 pin B50K potentiometer: DIY alternative?

I have a 6-pin B50K potentiometer used for the Bass/Treble control of a desktop speakers set. This pot is broken and getting this piece is costly to get (price, time - mainly from China). I don't need ...
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Potentiometer vs PWM for voltage tuning when charging a li-ion battery

Planning to buy a 30V adapter for charging a 7S li-ion (BMS integrated) battery. Need to reduce voltage to 29,4V. Considering mainly the health of the battery, would an integrated potentiometer be a ...
2 votes
2 answers
252 views

How can I use op-amps to compare two varying signals, and send out a signal if they deviate? [closed]

I am going to make a circuit (APPS, Accelerator Pedal Position Sensor Circuit) that sends out a signal if the input signals deviate more than 10%. It's one inverted signal (10V-0V) and one non-...
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