A variable resistor than can be changed mechanically.

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1answer
41 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
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2answers
54 views

Simple fan wiring with potentiometer [on hold]

I have a very simple circuit that consist of 2x 12V computer fans (0.05mA each), a potentiometer (500 ohms) and a 12 V DC supply @ 1.25A. I wired the pot 1 to 2, + to 2 and paralleled both fans to 3. ...
-1
votes
1answer
62 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
33 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 ...
-1
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0answers
65 views

Potentiometer with shafts [closed]

Is there a specific name for potentiometer shafts? I need short(length) 4mm D shafts, but cannot find them anywhere. Searching for potentiometer shafts just turns up full potentiometers and very long ...
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0answers
23 views

diy potentiometer throttle quadrant? [closed]

I'm trying to build a diy throttle quadrant as cheap as possible. And I'm using rotary potentiometer, so the only problem is how do I connect 3 rotary potentiometer, and possibly 4 buttons to my ...
0
votes
1answer
55 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
85 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
338 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
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0answers
34 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
109 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
77 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
112 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
231 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
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2answers
68 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
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2answers
52 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
43 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
100 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
73 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 ...
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2answers
73 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
0answers
55 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
104 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
146 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
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0answers
53 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
181 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
114 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
85 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? ...
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votes
1answer
91 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
126 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
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4answers
583 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
1k 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
368 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
524 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 ...
19
votes
6answers
3k 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
114 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
165 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
51 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, ...
0
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2answers
83 views

Potentiometer Ripple under load

I have the following circuit with a 10k 0.5w trim potentiometer. simulate this circuit – Schematic created using CircuitLab The voltage after the bridge rectifier is maintained at ~8.6 ...
0
votes
1answer
176 views

3296 trimpot adjustment

I've got a 3296 trimpot like this one: http://pdf1.alldatasheet.com/datasheet-pdf/view/78495/BOURNS/3296.html I don't know whether clockwise or counter-clockwise increases or decreases the ...
0
votes
1answer
70 views

Computer-readable potentiometer

I have a device that essentially controlled by a potentiometer and a rotary switch. I would like to keep these (although I would replace them with other components if that helped), but I'd like to be ...
0
votes
1answer
189 views

Magic smoke released from DIY PSU… but why?

I'm starting to learn what I can about electronics, and recently decided to follow this (and similar) guides to building a bench power supply out of an ATX PSU: ...
3
votes
2answers
349 views

What's the concept of potentiometer?

So here's a picture of a potentiometer from my book. And my book says that the potentiometer is used for measuring internal resistance (of a cell), emf (of a cell) etc. But I cannot understand the ...
0
votes
1answer
130 views

Is it possible to design this circuit with a single potentiometer (L-pad)?

I'm designing an L-Pad for my speakers. They attenuate the signal while keeping a consistent effective impedance, which is necessary for the amplifier and crossover circuits. Typically, these values ...
6
votes
1answer
265 views

How do I create a knob like on my amplifier

On my amp, I have a big round knob, that I can turn forever in both directions, to control volume. It simply turns up whenever I turn clockwise and down when I turn counter clockwise. There is no ...
1
vote
3answers
505 views

How can I scroll through all colors of an RGB LED using an Arduino microcontroller and a single Potentiometer?

The RGB LED is supposed to be controlled by PWM, how can I map the position of a potentiometer to a color combination?
4
votes
3answers
443 views

Where to get/How to make a potentiometer with “clicking” steps?

Maybe you remember that very old (and sturdy!!!) electrical panels/machines had those big knobs that you could turn to fixed positions (steps) with a very unique clicking sound. I need to make one or ...
1
vote
1answer
64 views

Potentiometer protection circuitry [duplicate]

My question arose from my previous question about a wind direction measuring circuit. Please have a look at the manual: http://www.fondriest.com/pdf/rm_young_05103_manual.pdf And here is the figures ...
1
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1answer
132 views

Wind direction measuring circuit

I have some difficulty to understand the schematics for the following anemometer: http://www.fondriest.com/pdf/rm_young_05103_manual.pdf I have confusion at 5 points. Here is the schematics: In ...
0
votes
2answers
93 views

How do I put in a volume control on this wired phone headphone set?

I have this headset which I use with a cordless handset. The problem is the volume is way too loud even if I turn it down all the way on the cordless handset. There are no controls on the headset. I ...
2
votes
2answers
367 views

Potentiometer Volume Control

Electronics theory newbie here (please be gentle): So I have an old guitar amp that had a crackly volume control. It also had an annoying habit of going from no volume to "too loud" with the ...