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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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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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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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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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 ...
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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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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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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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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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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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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 ...
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3 answers
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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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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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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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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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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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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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3 votes
2 answers
803 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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3 votes
2 answers
449 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
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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. ...
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4 votes
3 answers
317 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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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
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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 ...
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1 answer
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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 ...
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2 votes
2 answers
236 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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What type of trim pot material to handle up to about 5mA wiper current

I'm working on a design that requires that I trim a couple of legs of a circuit. It looks like 200 Ohm trim pots get me in the right area. The wiper current on one trim pot will be somewhere between ...
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Any solution to reduce the tolerance of a potentiometer? [closed]

In my design we use a slider potentiometer value of 10k with tolerance of 20%. At particular point of potentiometer whenever I come to that position my resistance value changes every time. Also every ...
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4 answers
117 views

Find resistor values for potentiometer

I'm supposed to find R1 and R2 so that the potentiometer outputs -1 to 1 V. I've been trying for hours so I'm ready to throw in the towel. I know the voltage across R1 and R2 have to be 1 V and -1 V ...
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Logical AND operation using transistors

I asked on a forum some time ago about why my logical AND operation doesn't work and I received this diagram: I don't use resistors, I use potentiometers to lower the voltage and I tried to adapt ...
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Wire potentiometer to dim LED with only 2 legs

Can this work to dim the LED?: And let the third leg free?
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Old potentiometer as a special voltage divider model

In an Adruino-like project that is built to deal with worn potentiometers (trimmer pots inside thumbstick, of alps alpine type), I am noticing a consistent set of input reading patterns among all old, ...
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What would be the ADC reading of a potentiometer whose wiper fails to be in contact with the resistor?

This question is part of an Arduino-ESC project I am building from the software standpoint. Some essential hardware questions tend to pop up every now and then. I noticed electrical noises in old ...
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1 answer
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Schmitt Trigger CD40106 has 5V at input with nothing connected

I am using Schmitt Trigger CD40106BE to make an PWM oscillator with controllable duty cycles. The schematic is shown below: However, the LED that should be blinking is constantly on. After some ...
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1 vote
2 answers
263 views

Arduino + ADS1115 + 10k pot noise

I am trying to make Arduino work in conjunction with 16-bit ADS1115 ADC and generic 10k potentiometer. However I noticed that there is some serious noise and values are way too inconsistent. Here is ...
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How would a fast moving slider of a potentiometer affect reading?

I understand that the length of the conducting wire/object is directly related to the resistance to the passing electrical current. This is pretty straightforward to understand. But, I wonder, what is ...
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How to protect potentiometer in adjustable soldering iron?

I have an adjustable soldering iron and noticed that recently at some position of the adjustment potentiometer (R3 in the schematic below, this is the potentiometer ...
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Finding resistance and voltage from Thevenin equivalent

I am stuck on a homework problem where the objective is to compute the top and bottom resistance of a potentiometer and the voltage of the source. I've gotten this far, but now I am stuck and am ...
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1 answer
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Correct "correlated" voltage tuning for (multiple) LED

I need to tune the voltage between 6 LED drivers (Meanwell hlg-320h-36ab) that delivers 36Vdc and a LED that can take 30-41Vdc 250w for each of its 6 strips (total 1500w). This will change the color ...
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Parallel 1-10 V dimming of multiple LED drivers

Can I dimm multiple ie., 6 of them HLG-320H-36AB Mean Well / datasheet (NB: no impedance data related to the dimming connexions), LED drivers with the 1-10 V (not PWM) method and only one ...
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Is this variable resistor not connected to ground?

I want to build the following PWM fan controller circuit: I am not sure about the connection of potentiometer. Usually one of the terminals is connected to the supply voltage and the other is ...
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1 answer
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Enhanced precision in the middle of a potentiometer

I am building a flight simulator rig that uses potentiometers to measure the position of various controls. I'm using a 10 bit ADC to read the value of the potentiometer as a fairly basic voltage ...
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Which resistor should I add in place of potentiometer in XL6009 boost converter module to increase 3.7 V to 12 V? [closed]

I'm using 18650 batteries with XL6009 boost converter module to increase 3.7 V to 12 V. There is a potentiometer to control the output voltage in boost converter. But can we fix the output voltage to ...
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I need help identifying this 10K 4Pin potentiometer

This blue Potentiometer is from a Numark NV DJ Controller. It has 10K, 4Pins and I need to replace multiple of them, since they're getting less accurate. You can get them for 12€ the piece on a ...
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1 vote
2 answers
403 views

4-wire fan controlled by potentiometer and 555 IC not behaving properly

Here's the schematics: Forgive me for the newbie schematics. This is the first time making one. I used an LMC555CN IC and this Delta BFB1012VH-5D84 Blower Fan (Can't find a datasheet for this one). I ...
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Can I control a PWM Fan with only a potentiometer?

If not, what else component do I need to control the fan? I ordered the parts and is still yet to arrive and am a newbie in electronics. I want to know if this is doable. Components I ordered: 5k, 10k,...
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