A variable resistor than can be changed mechanically.

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0answers
51 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 ...
1
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1answer
63 views

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

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
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2answers
45 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 ...
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3answers
140 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 ...
-1
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1answer
31 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!
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2answers
57 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 ...
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1answer
30 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
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4answers
58 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 ...
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2answers
30 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
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3answers
59 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
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0answers
33 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
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2answers
90 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 ...
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2answers
26 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 ...
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1answer
55 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 ...
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2answers
72 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
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0answers
43 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
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3answers
76 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
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1answer
77 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 ...
-1
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0answers
53 views

Problems with some potentiometers w/ Arduino and metal enclosure

I'm building an effects pedal of sorts, everything works, except some of the potentiometers are broken. They're all 10K, and I've replaced the broken ones with new ones but then another breaks. It's ...
0
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1answer
34 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
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1answer
69 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
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3answers
59 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
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2answers
79 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: ...
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1answer
76 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 ...
9
votes
1answer
474 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 ...
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1answer
94 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 ...
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1answer
50 views

help for timelapse slider motor circuit

I need some help designing a circuit for a timelapse slider. Please bear in mind i am a beginner with electronics, so have mercy! The motor will be pulling a trolley (very slowly) along a set of ...
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2answers
105 views

How to vary the voltage of a battery

Essentially, what I need to do is vary the output voltage of a battery between say 2V - 5V. This is to mimic the voltage output properties of a solar panel under different sunlight intensities. The ...
0
votes
1answer
73 views

Upgraded 10 turn potentiometers don't work whereas the original 1 turn potentiometers do. Why?

I bought this adjustable power supply kit and successfully assembled it. I wanted to upgrade the potentiometers to 10 turns so I could have fine control over the current and voltage limits set. Both ...
0
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1answer
44 views

Constructing an MCU controllable resistor

I need a resistor that I can control with an MCU like an arduino/raspberry pi. Ideally with 1M max resistance. The resistor will handle an analog signal range of \$\pm\ 9v\$. I've considered using a ...
0
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2answers
62 views

Audio Taper to Linear Potentiometer

I'm trying to linearize the output of an audio tapered potentiometer. Right now, I'm using ADC on a Beaglebone to read the value of a 250k potentiometer with 3.3V. I get a value between 0 and 1, but ...
0
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0answers
36 views

Spice-Potentimoter Plot… How to plot output voltage vs wiper position

Determine and graph a relationship between the output voltage and the potentiometer wiper position, which corresponds to the distance y. Assume that y changes from zero to 1 (for the top position of ...
0
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2answers
49 views

DC High Voltage Line Splitting Problem (Electrode “Tuning” Application)

I am having trouble coming up with a solution to a problem engineering a DC circuit that can take a single line input (Vin) and split into two outputs (Vout1 & Vout2). The goal of the circuit is ...
0
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2answers
86 views

audio-taper potentiometer in 50-100 ohm range [closed]

Anyone know where to source an audio or logarithmic taper potentiometer in the 50 or 100'ish ohm range ? Mouser and Digikey don't show anything, even non-stocked. I'd like to build an adjustable ...
0
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3answers
87 views

How can a pot allow variable off times in a time delay relay

I have a pellet stove motor that cycles on when an external potentiometer is dialed on. The run/on time period for the motor is always fixed--about 5 seconds, and then it pauses for a period ...
2
votes
2answers
61 views

Where can I use my ammeter to measure the current set by the current limit potentiometer?

Here is the circuit in question: (http://i.imgur.com/Jmo6mzL.png) The circuit is an adjustable power supply that I have put together (can be bought here) and I am working on putting it all together ...
0
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1answer
94 views

Information regarding old AB (Allen bradley) potentiometer JAIN056S102MA

i was looking for information (datasheet) regarding this old potentiometer from 1962 on the internet, JAIN056S102MA type J, 1k-ohm from Allen Bradley and i was not able to find any information about ...
3
votes
2answers
620 views

What are the terminals in this 6 pin potentiometer?

I want to use my 6 pin potentiometer in circuits so I want to know what all the terminals are for. I know the basic principle in the 3 pin pot. I'm completely new so please answer it in simple terms. ...
0
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5answers
113 views

Is it possible to use a potentiometer as a DP3T style control?

I'll try to be specific: I have an audio application that has 3 inputs and 1 output. The classic answer would be to use a DP3T to switch between the inputs. However, I would like to have a ...
0
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1answer
66 views

Is this something a P.L.C. would be able to do?

I wish to replace the zener diodes with a programmable chip, so that I can program the chip to do exactly what the zener diodes do in this circuit. This will then make the circuit universal to all my ...
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1answer
43 views

Looking for a replacement for a potentiometer [closed]

I am looking for a replacement for this potentiometer. I did plenty of googling but can't seem to find anything that remotely matches the model. The numbers on the bottom say: B103-32-8(dot)-KP
0
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3answers
142 views

zener diodes, different voltages, and using a relay to control its opperation…will this work?

Ok so I am going to admit that I am an idiot when it comes to circuits. However, some advice would be appreciated with regard to my idea. I am trying to control two seperate circuits, each with ...
0
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1answer
63 views

Creating a blinking circuit (sensor probe)

I'm a veteran of electronics with little knowledge if that makes any sense at all. I've dabbled in electronics for about 12 years now, and have had so much going on in life that I've strayed away from ...
3
votes
3answers
107 views

Why changing the potentiometer affects the whole circuit?

simulate this circuit – Schematic created using CircuitLab I have the following simple circuit where the potentiometer is used as a rheostat. 9V battery (-) --- 0.470K Resistor --- LED ...
1
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0answers
83 views

Constant current source - unexplained issues

I have been puzzling over this for days now, and cannot for the life of me figure it out... I have a constant current source set up to use as an analog dimmer for my LM3429 LED driver. I have made ...
1
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1answer
100 views

10k potentiometer symbol meaning?

i am trying to map this schematic onto a virtual breadboard but i dont understand what the 10k potentiometer symbol represents. am i supposed to connect the 5v terminal to the positive end of a ...
0
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3answers
123 views

Make a transistor act as a potentiometer

So, how would one get a transistor (probably BJT) to act somewhat like a potentiometer? What I trying to do is have xl6009 buck boost regulator be electronically controlled to charge a li-ion battery ...
1
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0answers
44 views

Use a potentiometer in place of a 4 position rotary switch?

I have a little oil heater in my house that is on the fritz. Its "Off-High-Med-Low" switch is just basically gone. While I might be able to dig out another switch from some of my electronics junk, I ...
2
votes
2answers
96 views

LM317T Hookup with 2K trimmer

I tried several times but without success to get the trimmer changing the output voltage of the LM317T . I tired to link the Pin 1 and 2 then all goes to ADJ pin of the LM317T and pin 3 to ground or ...
0
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1answer
55 views

Explain trim pot for VU meter

I have the following schematic that is supposed to rectify the signal going to a VU meter and also trim it, so the user can adjust the position of "0dB". What I don't understand is why and how the ...