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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0
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3answers
98 views

No output voltage on wiper when using pot as voltage divider

I've been trying to teach myself about potentiometers and how they can be used as voltage dividers. I bought some Alpha 10k linear pots to use in a really basic test circuit. I intended to connect the ...
1
vote
1answer
60 views

Using pot as variable resistor: should wiper be connected to spare end terminal?

I've heard somewhere that a rheostat uses two pins while a potentiometer uses three. But still, the thing i would like to know is if there's anything different with the adjustment if I wire the pots ...
0
votes
1answer
53 views

Modify pot to lower value while maintaining full range?

So i have a bunch of 100k pots. But i need a few pots that goes up to maximum of 100 ohms. I have tried to put resistors in series with the pot to limit the range and it does work, but the pot gets to ...
1
vote
1answer
34 views

Direction and Speed control using same throttle

I have a 24VDC permanent magnet motor such as those commonly found on a mobility scooter. I would like to be able to control both the speed and the direction of the motor with the same throttle ...
0
votes
0answers
29 views

led strip dimmer using potentiometer with switch built-in

I have made a dimmer for a small led strip with arduino and a potentiometer. see schematic below. the 12v are taken down to 5v with a buck module to feed both arduino and the pot. So arduino reads ...
0
votes
3answers
38 views

L200c power supply, pot won't go down to 0 ohms

So I'm trying to make a power supply using the L200 regulator. I'm using the circuit in Figure 1. Programmable Voltage Regulator with Current Limiting. I made the circuit after that design. Except ...
0
votes
1answer
28 views

Potentiometer infinite resistance to fixed value

This maybe a silly question, but my brain is stuck: I need to add to my audio circuit a potentiometer that can go from infinite ()total interruption to 10k. imagine a light bulb that can go dark to a ...
2
votes
2answers
40 views

24 VDC source to 0-5 VDC or 4-20 mA manual input

I have a PLC which offers analog inputs of either 0-5 VDC (6 VDC max) or 4-20 mA (sink). The source will be 24 VDC and I want the input to be manually adjustable (assuming with a potentiometer). The ...
0
votes
2answers
72 views

What are automatable rheostats called?

I need to find something like this but that is automatable, over I2C or GPIB or something. Is there a name for this? I am having problems finding something. Worst case I can buy this and hook up a ...
0
votes
0answers
69 views

Audio POT with FET and PWM

I've been trying to build a simple audio pot to be controlled with PWM with an arduino, but I'm not sure why it doesn't work. I could do it with a LED (not directly which is simple, but with a FET), ...
0
votes
1answer
51 views

Unable to make a pot work correctly

I have a board I salvaged from a joystick that uses potentiometers to measure the location of the arms. On the PCB a edge pin and the center pin are wired together. I would like to connect the pots to ...
2
votes
2answers
45 views

How to by-pass non-functioning 4-post volume pot [closed]

I have an old AT&T Tel. answering device that I would like to keep going as long as possible. However, the volume pot is absolutely shot after trying to service/clean many times. I haven't been ...
0
votes
3answers
100 views

Convert PWM to Analog using a DAC chip in order to emulate a Potentiometer for audio

I'm trying to control audio level/gain (from line or amplified signal) using an Arduino. I do not want to use SPI, for this project I can only use the PWM outputs, thus I do not want to use a digital ...
0
votes
4answers
97 views

How does electric current flow through a potentiometer?

I'm very new to electronics so I'm still grasping some of the fundamentals. I'm trying to figure out exactly how a potentiometer works and how the current flows through a circuit with a potentiometer ...
0
votes
1answer
56 views

How to pick resistor values for voltage range with potentiometer

How do I pick resistors for a 12v-30v boost circuit using an SDB628 IC; Vout= 0.6(1+R1/R2). I am using a 50k pot for R1. How do I get that 12v-30v output voltage range? To get 30V, my calculation of ...
0
votes
1answer
45 views

Calculate base resistor of PNP transistor in switching circuit with variable resistance

I would like to read analog input on my Raspberry Pi using various resistive sensors I represent in the schematic below as potentiometers (R5 ad R7). I need to be able to switch the circuits on and ...
1
vote
1answer
41 views

Potentiometer “US 250KA” same as 250k?

I want to replace the potentiometers in my electrical bass due to scratching. All three of them (volume of pickup 1, volume 2, tone) are of the same kind, "US 250KA" single-turn (no push/pull). Is ...
1
vote
1answer
22 views

Rotary Sensor Potentiometer SP280X series

I have a novatechnik rotary sensor potentiometer SP2801 100 002 001.Th datasheet shows that it has a maximum electrical angle of 100 degree.But I saw that we can move the pot in any direction any ...
0
votes
3answers
82 views

decrease 32V 3A DC voltage to 28V 3A

I am now building a power supply for a 100W LED light. Right now I already got 32V DC from my DIY Power Supply, with 3A current. I try to enable my PS to dim the light by regulate the voltage to the ...
5
votes
2answers
420 views

What's a potentiometer with four terminals in this schematic?

I'm reading the datasheet for a TDA2005 IC. In it, there's a application circuit schematic with two potentiometers that have a fourth terminal in it. See below: The components I'm talking about is ...
0
votes
0answers
43 views

Constructing a new wiper for a slide potentiometer

I have some old slide potentiometers which have missing wipers. Replacing them with new potentiometers is not really an option as they belong to some vintage gear. What is the best way to construct ...
3
votes
4answers
277 views

The potentiometer used in electronics is not a measuring instrument. Why it is called a meter?

Why this kind of variable resistor is called a "meter", when it is not a measuring instrument? I have seen another instrument of same name. In our school physics lab, there was a big rectangular, ...
0
votes
2answers
56 views

Wiring a membrane potentiometer to give two outputs

I'm using a softpot membrane potentiometer in a project and I have found that pressing two fingers on the strip gives strange results. I was expecting it to short to the lower resistance value but in ...
0
votes
1answer
56 views

Why is using a potentimeter as a rheostat treated different way than a resistor?

This might sound a bit weird question but I’m having some confusion regarding some fundamentals on potentiometers used as rheostats. Here I will try to explain by using the simple circuit below: ...
2
votes
4answers
95 views

A question on using potentiometer as a variable resistor

I have a 10k poti. I use it as a variable resistor by soldering two of the three terminals. It is connected to a 1/4 watt 220 ohm resistor in series(this is the load). The voltage across this circuit ...
0
votes
2answers
191 views

Is my 600W boost broken or malfunctioning?

I'm asking this mainly as a sanity check and to distinguish between whether I've just done something wrong or need to buy a new one. I have a "600W" boost converter based on the UC3842A SMPS w/ CC ...
0
votes
1answer
77 views

How to use an 2-axis accelerometer as a potentiometer? [closed]

I've got a couple of Memsic 2125 accelerometers around and wanted to try to use one of them to replace a pair of potentiometers in a circuit (x axis replaces pot A, y axis replaces pot B). How would ...
0
votes
2answers
70 views

Measuring a potentiometer with noisy power

I need to measure a potentiometer where the voltage supplied is very noisy and cannot be filtered. I run into this a lot in my work, but currently I'm trying to measure a steering angle potentiometer ...
0
votes
3answers
289 views

Why can't I vary the speed of a dc motor with only a potentiometer?

I made a simple circuit with a 9 volt battery, a dc motor, and a potentiometer. The positive of the battery is connected to one side of the potentiometer and the negative to the other. One side of the ...
-2
votes
1answer
40 views

Improving the linearity of a potentiometer after loading

I could not understand why is adding 'Rlin' in the second figure improves the linearity of the system? A little help pls!
-2
votes
2answers
108 views

Electrically loaded resistive Potentiometer!

According to my course book, Potentiometers produce a linear output as a function of displacement, provided that the potentiometer is not electrically loaded!, what is electrically loaded???, mean in ...
0
votes
1answer
32 views

Resistive ribbon sensor multiple readings

I created a resistive ribbon sensor using a resistive strip as follows: When making contact between A0 and the resistive ribbon (e.g. at the location of the red circle) using a bridge, I can ...
1
vote
4answers
234 views

Is there a potentiometer model for LTspice?

I started designing a model for a three-terminal potentiometer in LTspice, since none are included and it's such a common component. Drawing the .asy symbol and the wiper terminal, it dawned on me ...
0
votes
2answers
31 views

Why there is continuous variation in output frequency of a Hitachi Inverter (L100 Series)? [closed]

I am using a Hitachi L100 Series inverter and its frequency source is Keypad Potentiometer. During run it is continuously changing the output frequency which is displayed on the Operator Display ...
1
vote
3answers
79 views

Replace a 500Kohm potentiometer with a digital one

In layman's terms, I want to replace a Commodore 64 Paddle controller with a programable one. I thought that the best approach is to replace the manual ~500k ohm pot used by the paddle with a ...
0
votes
0answers
34 views

Building Guitar Pedal, but tone pot is not doing anything

Alright, so I'm building a guitar pedal (below you'll see my schematic) and I switched out the tone pot and the volume pot so that I could use a different knob (I know, dumb reason). But the tone pot ...
1
vote
2answers
98 views

How to create a linear current response from a passive pot circuit?

I am wanting to linearise the current response of a circuit which currently has the resistance change from a linear pot. I have a current input that I want to test using a test jig/simulator. The ...
0
votes
2answers
32 views

Prevent Exceeding of Potentiometer Power Rating

I am using a 10k digital potentiometer to adjust the brightness of an LED. However, I need to make sure that when I reduce the resistance on the pot, it will not exceed the maximum power ratings. The ...
0
votes
1answer
69 views

How can I build a dual potentiometer?

I am about to build a wien bridge oscillator circuit which is shown in the figure below: However, I need a dual potentiometer to do so, because the resistors VR1a and VR1b must have the same value ...
0
votes
2answers
143 views

Can a single potentiometer be hooked up to multiple fans to control their speed?

I have recently learned about potentiometers and their "variable resistance" porperty. I am looking to hook up a Potentiometer in order to control 4 12VDC Fans. I am not sure if that is a good idea, ...
0
votes
0answers
47 views

How to correctly control contrast on a JHD202C LCD display

I have a JHD202C LCD display, for which the datasheet is available here. Please note that there are more than three pages in the PDF file, one must download it to see them. TL;DR: Which of the two ...
0
votes
3answers
90 views

Burned out potentiometer

DISCLAIMER: I am just tinkering with electrical engineering and can barely do the basics yet. Background I have done a little work on a breadboard connected to my Raspberry Pi, but today I wanted to ...
1
vote
1answer
91 views

PWM or Variable Resistor [closed]

For a school project, I have to design and perform an experiment of my choice. I have chosen to test the efficiency of variable resistors and PWM circuits by testing the amount of energy wasted (heat ...
0
votes
1answer
46 views

Selecting potentiometer for adjusting Vo in DC-DC step down

I am trying to figure out the correct value of a potentiomenter for trimming Vo in a step-down DC/DC converter. I am using a 150W 12V output DC/DC from murata. From the datasheet, equations are given ...
0
votes
1answer
74 views

How to control the speed of rotation of a servo using a potentiometer?

I'm trying to write a program using BASIC to turn a servo 180 degrees back and forth, and to use a potentiometer to control the speed at which the servo turns. I have a code, but when I run it, the ...
0
votes
3answers
68 views

How does potentiometer influence incoming current in the circuit?

As you can see from the picture, shouldn't the 100 Ohms be the only current influencing factor at whatever the voltage it is supplying? How does Potentiometer on the right side cause decrease in ...
0
votes
2answers
87 views

Amplifier volume potentiometer causes voltage offset

Using answer about microphone I have built a simple amplifier. simulate this circuit – Schematic created using CircuitLab I changed some of the parts due to my needs and resources. R1: ...
1
vote
1answer
125 views

100k linear potentiometer with arduino

Is it OK if I use 100K linear potentiometers to input values to Arduino? The documentation specifies 10K should be used and I suppose that would translate to 0.5mA power consumption which would be ...
10
votes
1answer
525 views

Potentiometer vs Varistor

What is the main difference between and potentiometer, rheostat and a varistor? And how do the application of the three in a circuit differ? Or to be more concise, in a variable power supply why ...
1
vote
1answer
156 views

4-20mA Potentiometer to arduino questions

I've recently been messing around with the arduino uno and potentiometers. I got a potentiometer from where I work but im not sure how I should hook it up so I don't mess anything up! There are 3 ...