A variable resistor than can be changed mechanically.

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4
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4answers
263 views

Circuit for a coarse and fine setting potentiometer?

I've tried to find a circuit for a coarse and fine adjustment (two potentiometers) voltage divider, but I don't understand it and/or they don't have a linear response. Problem: I want to have an ...
0
votes
0answers
25 views

Bypass potentiometer on a Sennheiser PC360 G4me headset [closed]

I have a Sennheiser PC360 G4me headset which makes a crackling noise when using the volume up/down knob. After doing some research it looks like contact spray could do the trick in some cases but for ...
0
votes
2answers
94 views

How to connect this potentiometer to this PCB?

How am I supposed to connect this potentiometer to the PCB?
0
votes
1answer
38 views

Arduino analog input higher than reference but lower than 5v [duplicate]

I'm going to use a very precise potentiometer that can measure angles from 0 to 3600 degrees (10 rounds), but I only need the first 180 degrees or so in this project and I need it to be more precise ...
0
votes
0answers
38 views

360 dual-wiper potentiometers

http://www.edn.com/design/components-and-packaging/4405828/Rotary-encoder-with-absolute-readout-offers-high-resolution-and-low-cost ^ That's the synopsis of what I'm looking for. I have a bunch of ...
0
votes
0answers
37 views

Help with Op-Amp project

I have an Op-Amp project, and im stuck on the last part of it; I was wondering if anyone would be able to help; http://imgur.com/GdEWKMN (project outline) http://imgur.com/FVPEr4C (Part A solution) ...
0
votes
1answer
59 views

Help converting analog potentiometer to digital

I have a 3 dial motor control assembly that is using 3 potentiometers to control 3 independent 110v motors speed. The label on the pots read TO50K 1339 (first O has a "S" like shape inside). I have ...
0
votes
2answers
81 views

Audio Potentiometer with external way to know position

At the moment I am trying to create an audio circuit, in which I need to reduce an audio signal from 2 V into a variable output of 0,030 V to 0,350 V. For that I think a Logarithmic Pot will do the ...
1
vote
1answer
89 views

Connect 8 ohm speaker output to microphone input on another system

I see the question was answered in 2013, but in addition, Id like to ask the follow question(s); I have a significantly stronger speaker (output) than a computer speaker discussed in previous post. ...
0
votes
1answer
115 views

Connecting potentiometer to an ATX PSU

I've got a 500W ATX PSU (more info about it here) and I would like to use it as a sort of bench power supply. I know that there are many guides about how to convert an ATX PSU to a bench lab power ...
1
vote
1answer
51 views

impedance matching to mechanical sensors?

I am working with 40 sensors and almost all the sensors are mechanical. I have some potentiometers converting mechanical displacement into voltage but the resistance of the voltage source is changing ...
0
votes
2answers
108 views

What is the need for a pull-down resistor in this schematic?

here at the second page: http://www.skyeinstruments.info/index_htm_files/W200P%20Windvane.pdf there is an external 470k resistor in parallel with the measuring device. it seems like the manufacturer ...
0
votes
1answer
117 views

Controlling an RGB 5050 LED strip with Arduino and potentiometers [closed]

I recently found and old amplifier with the speaker taken out of it and thought it would look nice as a light feature. The switches and potentiometers are still in place but have removed the power ...
0
votes
2answers
61 views

Bias headphone audio signal for use with digital potentiometer?

I am attempting to control speaker volume via a digital potentiometer, the problem being that audio signal goes both above and below 0V, for regular potentiometers this is no problem but for digital ...
0
votes
3answers
100 views

Pot and Knob shafts, Ds and Flats

Is it a standard in D-shaft, right-angle potentiometers for one endpoint to point the flat face of the shaft to the right of noon, sweep clockwise, and have the other endpoint to the left of noon? And ...
0
votes
0answers
48 views

Slewing sensor across entire 5V input signal using potentiometers

I am trying to slew a vacuum sensor in my car. My trouble is, use of a single potentiometer only allows for slewing of the lower range of the input signal, that is, from 0 - 100%, the signal can only ...
0
votes
1answer
79 views

Replace potentiometer with digital version (Speakers)

I am trying to get my PC speakers to be controlled by my arduino. I've taken apart the control and it seems very straight forward, just need a few questions about subbing the manual pots for digital ...
-1
votes
1answer
80 views

How to use whole rotation of log potentiometer?

I want to use a Log Potentiometer to adjust the loudness of a speaker. Therefore I connected the Stereo logarithmic pot with 10 kOhm resistance to a Sonos CONNECT:AMP with an output of max. 110W (8 ...
2
votes
1answer
44 views

Trimmer pot to fixed resistor conversion

Sorry for the simplicity of this question but I've been struggling on this circuit for a while. In the schematic link below you'll see a trimmer pot and I simply want to replace it with one/two fixed ...
0
votes
1answer
72 views

Need help to identify potentiometers, please

I have to replace some scratchy potentiometers used as volume potentiometers in a Rocktron Velocity 300 guitar power amp from the early 1990's. These two parts are labelled: 15A100K 9252 TØB10K ...
1
vote
2answers
94 views

Why are these two potentiometers affecting one another?

Let me first say, that I am no electrical engineer so thanks for taking the time to deal with a layman. Background In my workshop, I have two sets of speakers hooked up to a common 3.5mm audio ...
3
votes
1answer
432 views

Why does the potentiometer burn up in my setup?

I connected a potentiometer to my DC power supply (max 1A, 12V), and then connected a motor to the variable voltage side of potentiometer as well. The potentiometer is just 1K. When I tried using ...
1
vote
0answers
43 views

Linear vs. Audio Taper for RC Network

I'm building a distortion pedal and I was wondering which tapers to use for which potentiometers in the tone control section. I normally design my own circuits, but I'm going by someone else's ...
1
vote
2answers
179 views

How can I increase the torque, but not the speed of this DC motor to gear with a potentiometer setup?

Short video of the machine running. It's made of three AAA batteries in series giving a total of 4.5V to the DC motor, these are connected through a potentiometer to control the speed. The DC motor ...
0
votes
2answers
116 views

Wien bridge using single potentiometer

I'm making a function generator which works in the audio range for a college project. I'm not allowed to use microcontrollers or any digital chips. So I'm using a Wien Bridge oscillator with a pot to ...
0
votes
3answers
224 views

How can I emulate two analog joysticks (potentiometers) with an Arduino?

I have a quadcopter (Syma X5C) that I really want to control with an Arduino. Since I have the ability to write programs to my Arduino to make the quadcopter fly autonomously, I want to modify my ...
1
vote
2answers
616 views

Connecting a potentiometer

I know how to connect potentiometer, but to be honest I don't know why. I would really like to understand what I'm doing. From what I have read the input voltage and the ground should be connected ...
0
votes
2answers
98 views

Connect 2 items on the same 5v port on Arduino

im kind new to the arduino and im experiencing the following problem. Me and my friend build a circuit with a distance sensor which gets the distance and visualize it. The sensor requires a 5V power ...
0
votes
2answers
55 views

Potentiometer after NPN transistors

I was looking to use a potentiometer to limit brightness for LED matrix. The problem I ran into is I would need a lot of potentiometers. The Led matrix will be multiplexing so only one Led will be on ...
1
vote
1answer
59 views

dual piezo pickup

I experimented with different types of piezoelectric disks as double bass pickups and found two that picked up different parts of the frequency spectrum decently. The specification of the two piezos ...
1
vote
1answer
150 views

Headphone volume control works for one speaker only

I have just completed my first ever electronic creation, a pair of headphones. It composes of a TRS stereo jack joined to four leads (left, right and two for common ground) braided nicely along the ...
0
votes
1answer
100 views

Connect two-function brake light to three-function car circuit

I need to replace my 12VDC (bulb based) brake lights but I am unable to find a three-function light (Running/Brake/Off) with the same specs. I did however find a two-function light LED fixture ...
-1
votes
2answers
120 views

What kind of ranges exist for potentiometers?

I am building a small dc motor that is driven by a 2v AA battery. I want the potentiometer to adjust the speed of the motor by increasing and reducing the current through the motor. For this i am ...
2
votes
1answer
100 views

Does use of cermet pots lead to scratching in a DC audio circuit?

I am putting together an audio EQ module that is DC coupled. I have read in many places that carbon pots will scratch due to DC present in the circuit. Do cermet pots exhibit the same behavior? I ...
0
votes
1answer
114 views

Simple NPN circuit

I'm stuck on the start on my school project. I need to design and build this circuit. Transistor parameters: Ic = 0,5A, Uce0 = 80V, Ucb0 = 80V, Pd = 0,625W, h21E = 100, LED Diode parameters: Uf ...
2
votes
2answers
196 views

How do I use an adjustable LDO regulator to power devices with USB that usually use AA/AAA batteries (or should I)?

I want to use USB to power devices designed to work with one, two, or three AA/AAA batteries. Three seems to be the trickiest, because it involves dropping the voltage only ~0.5 V from 5±0.25 V to 4.5 ...
0
votes
0answers
56 views

Help measuring potentiometer resistances

I have the following wind-vane: link Schematics for it is on page 8, and the model is 4.3150.00.012. It means it has protective circuits. My problem is as follows: Document says it uses \$2k\Omega\$ ...
0
votes
1answer
244 views

XY table using motorized potentiometers

I'm trying to implement a XY table using 4 units of these motorized potentiometer, controlled by an Arduino. Since I have other uses in mind, I'd like to use as few pins as possible, wich would imply ...
0
votes
1answer
148 views

Multiplexing 4 DC motors with arduino

I'm aiming to control 4 motorized faders with an Arduino. However, I'm still trying to figure out how to best multiplex all the inputs/outputs. Each fader has two potentionmeters and one touch ...
-1
votes
1answer
99 views

Display in hyperterminal analog and digital values from a potentiometer through micro-controller

This is the code that we have tried, it shows some digital values but not the analog values. Is there something wrong with the code? Can it be improved in some way? ...
-1
votes
1answer
111 views

Choosing right trimmer and capacitor in LM317 circuit

I am working on stable, low ripple +22V power supply for TLC5940 IC. I am working a circuit based on the model of Texas Instrument's LM371 circuit . Now, what kind of R2 and CADJ should I use for this ...
2
votes
2answers
135 views

Is it possible to scale +5v : -5v AC to effectively 0:0 with a potentiometer?

I'm a hobbyist so my theoretical knowledge surrounding electronics is pretty limited. I'm working on modifying a synthesizer that uses a sine wave control signal whose frequency is in the sub-audio ...
1
vote
4answers
855 views

LED matrix dimming: How to control the current in a 12V LED lamp for video lighting?

I'm trying to dim a 12V LED lamp (LEDs specification here however schematics have the real values...) I've build for a video lighting application. My initial thought was to use a potentiometer but it ...
-1
votes
1answer
2k views

Adding a potentiometer to a motor circuit to control speed

How can I add a potentiometer to control the speed of this motor in this circuit? It is a 3-12V DC Motor 2RPM max. I am unsure as to what kind of Potentiometer to use, or how to include it into this ...
2
votes
4answers
557 views

Potentiometer Puzzle - TIG Pedal

I'm looking at a brand new foot pedal for a Tungsten Inert Gas (TIG) welder. This foot pedal uses cascading potentiometers to send a signal to the welder control system. I'm getting unusual results ...
6
votes
3answers
529 views

Can I do this tutorial without a potentiometer?

I am trying out online tutorial to practice python and Raspberry Pi. I am currently following this tutorial. It says a potentiometer is needed, but I don't have one. The lcd I have is JHD162A What ...
21
votes
6answers
4k views

Why should I use a logarithmic pot for audio applications?

Just got really curious about it reading this answer from Spehro Pefhany. There Spehro comments that one should use a logarithmic pot for audio applications. So I googled for it. The best I could ...
1
vote
1answer
135 views

Potentiometer not reading ohms

I have a potentiometer for the volume control in my electric guitar. My multimeter reads 485K ohms on a 500K pot putting my test leads on each outside lug, which is fine I believe. When I put a test ...
0
votes
3answers
244 views

Linear potentiometer for suspension travel

I am working on a project for university measuring the extension of a cars suspension. I have a potentiometer available to me, but have a few questions regarding how to use it. I understand that it ...
0
votes
1answer
71 views

LM393N with hysteresis and potentiometer

I am having a bit of a problem with this next circuit: The problem is, when there is 0V at the base of Q1 and when the potentiometer is set close to 100 kOhm. Because of the hysteresis set on LM393N, ...