A variable resistor than can be changed mechanically.

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1
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0answers
25 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
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0answers
38 views

How to find replacement slide potentiometers [closed]

I would like to replace some slide potentiometers in an old Roland synthesizer (Pictured below). It was last produced in the mid 80's so getting a direct replacement is not possible, apart from very ...
1
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2answers
81 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
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2answers
63 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
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3answers
86 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
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2answers
206 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
59 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
51 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 ...
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1answer
38 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
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1answer
79 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
69 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
61 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
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0answers
51 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
102 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
125 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
49 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
138 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
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1answer
95 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
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1answer
81 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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1answer
73 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
120 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
442 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 ...
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1answer
576 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
275 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
520 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
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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 ...
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1answer
109 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
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3answers
137 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
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1answer
43 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
80 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
139 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
68 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
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1answer
173 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
285 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
118 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
251 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
422 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
384 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
58 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
vote
1answer
126 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
92 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
322 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 ...
8
votes
6answers
293 views

Can this work as an ADC Input setup and is it common?

Would this work? I'm pretty sure in theory it should, but I don't see it often or at all. In theory, the voltage divider from 2:1 to 1:2 should give 3.3v at one end and 1.6v at the other end of the ...
1
vote
1answer
94 views

Digital potmeter in transimpedance amplifier feedback

I am considering using a digital potmeter with, e.g., I2C interface as the resistor in the feedback loop of my transimpedance amplifier. I am concerned about this. Will this add any additional noise ...
1
vote
1answer
125 views

How to connect a “touch sense” pin to a analog or digital input

I'm using a motorized fader that has a "touch sense" pin (see this data sheet), which should be able to detect when someone touches the fader. I want to use it to stop the motor and switch from ...
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votes
2answers
624 views

How to use a digital potentiometer to control current

I am attempting to rig an RC Car's rear wheels to an arduino. Initially I attempted to just hook it into the powered digital pins but after MUCH headache I realized I wasn't getting enough current. ...
4
votes
2answers
212 views

Maximum power transfer

I have problems to solve the next exercise about maximum power transfer. I know that potentiometer has two internal resistors. In this exercise, I must find the \$R\$ value to transfer maximum ...
1
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2answers
131 views

Potentiometer voltage change

I'm trying to understand simple things about electricity reading allaboutcircuits.com web. This chapter includes image which´s principle I don't understand. Here it is: When supplying constant ...
2
votes
2answers
382 views

How can I stablize an analog to digital reading?

I've built a clock out of a PIC16F877, some LEDs and other stuff... To set the time in 5 minute intervals, I'm using a 22K ohm potentiometer connected between GND and +5V with the contact connected ...
2
votes
2answers
204 views

Capacitor in circuit for potentiometer?

In a German tutorial video about EAGLE, starting at 1:15 the author adds a trim potentiometer for regulating the contrast of an A162 display. Between the slider and ground he adds a 100 nF capacitor. ...