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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3answers
48 views

Speed up or slow down motor of cassette recorder using a potentiometer

Background: There is a cassette recorder (RadioShack CTR-80A) and its owner would like to have the ability to speed up and slow down the motor to record and play the sound in a distorted way. We've ...
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1answer
45 views

SMD potentiometer direction

I currently struggling with a circuit and trying to identify the parts which may cause the problem. The circuit needs a trim potentiometer. Mine looks like with the symbol Does the direction have ...
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1answer
73 views

I'd like it if my circuit was checked

LED strip runs on 0.5-2A. LED Strip needs 5v, has one pin for that, one for red, one for green, and one for blue. I will be using a total of 4.8 volts. Using ohms law, with the minimum current as the ...
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1answer
60 views

Is there a practical way to convert a log potentiometer to an inverse log one?

I want to convert a log poti to an inverse log poti. The difference is shown below: Let's say we have a 10k log poti, is there a practical way to inverse the output so that we can obtain something ...
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1answer
36 views

potentiometer as voltage divider and taper

assuming that I'm going to change the potentiometer value (now is 50K linear) to 100K linear, should I also change the value for R1 and R2 in order to keep the same taper and the same power ...
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49 views

What could be the reason to use a current source for potentiometric vane measurement?

On page number 507 of this document, there is a signal conditioner for a potentiometric wind vane. It seems like they use a current source but I don't get how the mechanism works. I guess O/P ...
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1answer
98 views

Lowering resistance of potentiometer?

I saw a video where a person wired a resistor to the outer pins of a potentiometer to lower the resistance. Does this work? And if it does, can I still use the wiper and an outer pin with it lowered? ...
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1answer
49 views

Does a multidimensional Soft Pot Exist? [closed]

I have no idea if this exists, but I'm looking for a soft pot/ribbon sensor that would function like a laptop trackpad (ie. giving a resistance value for the X position of the finger on the pad and a ...
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31 views

Analogue encoder / multi-throw infinite-turn “potentiometer” from two-axis potentiometer/joystick

For an analogue multichannel audio-panner I essentially want to create something like an infinite-turn multi-throw potentiometer. The idea is to have one input which is distributed to 4-8 outputs ...
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2answers
142 views

I'm struggling finding everything I need to know to pick out a pot

I'm trying to make a color mixer with 3 potentiometers and a lightstrip. Each potentiometer will control a LED, one red, one green, and one blue. The voltage requirement for the strip is 5v I think, ...
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1answer
208 views

Is volume controlled through a potentiometer?

Eletronics newbie here. I am building my first prototype (using an Arduino) that includes a volume knob. I want to know if volume is controlled by a potentiometer because I saw this video and it got ...
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1answer
37 views

Potentiometer volume control for a piezo buzzer in bridge (2-pin) configuration

I have a 10K potentiometer that I'd like to use to control the volume of a piezo transducer/buzzer, which is driven by one or more MCU PWM-capable pins (ranging from 0 to 3.3V). Originally, my ...
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2answers
42 views

Wiring a Potentiometer for a positive voltage

I am attempting to make my own adjustable voltage supply that provides a positive voltage (anywhere from 0 to +200 VDC). The sections I have devised so far are able to provide 450 VDC, however I need ...
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4answers
174 views

Is it possible to sweep 20 Hz to 20 kHz with one potentiometer?

I'm designing a resonant filter based on a state variable filter topology with sweepable frequency and variable resonance. The filter is designed to sweep from roughly 20 Hz up to 20 kHz (50 kohm ...
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76 views

What is the difference between a potential divider and a potentiometer?

It would be nice if I could get an elaborate answer which highlights the difference between their functional aspects.
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46 views

RGB Illuminated Potentiometers

I'm currently designing a circuit using Alpha RV141F-40-20BL-B50K Potentiometers which feature a clear shift into which a 3mm LED can be inserted. My initial plan was to just fit a WS2812B ...
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2answers
94 views

Fine, coarse adjustment digitally

I want to add fine and coarse adjustment to a power supply for both voltage and current control, for fine tuning I'll need four potentiometers either 10 turn or regular ones. I was thinking to trim ...
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1answer
51 views

How to turn a motor while obtaining the angle it turned?

I need a device where it can turn mechanically, while be able to measure the angle of which the motor turned. One solution I thought about was to connect the motor with potentiometer. However, is ...
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4answers
62 views

Making sense of potentiometer connections

I have stumbled across a problem with potentiometer connections that I have no idea how to tackle. What are the differences of the two circuits below? I understand that the one on the right is the ...
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3answers
2k views

Resolution of potentiometer

I'm a bit confused about the resolution of a potentiometer as a voltage divider. What's the relation between voltage and number of turns in a pot? For example In below circuit: What the resolution ...
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1answer
34 views

Double switch potentiometer

I'm looking for a type of potentiometer (ideally about 500k) that has a feelable click switch at both ends. I have only found ones with a single on/off switch. What's the term I need to look for?
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1answer
105 views

Set the Gain of an Opamp Accurately Using a Potentiometer

I want to set the gain of an opamp accurately using an potentiometer, with low thermal drift and good long-term stability. From what I've read, there are three basic ways of doing it, but none of them ...
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3answers
173 views

Circuit to light up an LED with a potentiometer

I have a 10k potentiometer and an LED. I want a circuit to light up the LED only when the potentiometer is at one specific value. It can ramp up in brightness to that value, and then ramp down past it....
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1answer
96 views

Improving the classic 18V mod for guitars

I am trying to figure out how to use a potentiometer or some form of fader to bring my circuit from 9 V to 18 V, and then back to 9 V without it being permanently one or the other, having to ...
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2answers
51 views

Variac/Potentiometer heating up

I have a large potentiometer ( that we also call a variac) that is rated for 220V at input and a 0-250 V 8A ouput. My mains run at 230 V and 50 Hz at 16A I assume. Is the difference in current the ...
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0answers
24 views

Increasing Potentiometer Sensitivity with Passives:

Imagine a linear potentiometer with a 180 degree rotation range connected between +5 V and 0 V. Turning the potentiometer from 0 to 180 degrees will sweep through the entire voltage range. I would ...
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0answers
26 views

Driving Headphones with ATmega324A

Background: I am considering the Texas Instruments TPA6138A2 as a combined headphone amplifier/low-pass filter solution to convert two 0-5V PWM signals from an ATmega324A (which can source/sink up to ...
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1answer
66 views

Rotary potentiometer angle to voltage relation

I have a 10k rotary potentiometer which turns from 0° to 270°. I wire it to an Arduino with the middle pin (2) connected to an analog input (A0) and the other two pins (1 and 3) connected to 5V and ...
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1answer
74 views

Is this potentiometer linear or logarithmic?

I have old potentiometer Alps 902B-250KBX2 in my amplifier. I need to replace it, but I don't know is linear or logarithmic? It should be linear, because it has letter B in mark. But one my friend ...
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0answers
31 views

Potentiometer usage for a 24V 4A pump application

I have a 24V-4A oil pump that I use for smoke oil in my jet. I currently control the flow by using a needle valve in the oil line which restricts the flow from 2.1 gpm down to .75 gpm. I am wondering ...
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3answers
98 views

Determine angular position from two potentiometers

I am trying to generate a continuous angle based on the output of the two potentiometers that are inside my device. The pots are shifted by 180 degrees and are capable of spinning continuously. How ...
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2answers
59 views

Increase resistance to turn on a light bulb

I’m wondering if it is possible to use a potentiometer to turn on/off a lightbulb in a binary manner. I’m thinking high resistance = light on. Low resistance = light off. Is there such a circuit? ...
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1answer
84 views

Using the same potentiometer for two 555 timers

simulate this circuit – Schematic created using CircuitLab I have two 555 timers hooked up and I want them their duty cycle to be controlled by the same potentiometer. The second one has twice ...
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1answer
74 views

How to drop 28VDC for Voltage regulation between 14VDC and 16VDC

I want to convert 28VDC to run a LED map light that turns on at 14VDC and reaches its safe brightness at 16V (30mA). I used a 1k ohm potentiometer and a 1kohm resistor and dropped the voltage to where ...
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1answer
54 views

Limiting the pulse width of a PWM by using voltage divider and a single power supply

I'm using a Tl494 PWM and I want to limit the pulse width from 0% to 80% of the signal as maximum. How can I achieve this using a SINGLE 5v reference supply (I know it can be achieved by using two ...
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1answer
105 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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111 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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1answer
59 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
88 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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5answers
148 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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0answers
96 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
188 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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0answers
63 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
107 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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2answers
180 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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0answers
93 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
74 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
91 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
96 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
109 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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