A variable resistor than can be changed mechanically.

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2answers
48 views

Hooking up an 8x8 LED board

I recently bought this 8x8 LED board from geeetech which came with this datasheet. I'm new to programming so I bought this board to "figure it out" but now I'm running into issues I don't understand. ...
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0answers
33 views

Using capacitors to control the speed of a relay loop

Background: In my autoshop class at school we are required to make a circuit that uses relays. When one relay comes on the other one shuts off and it creates a loop in which they switch really ...
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1answer
58 views

Could I add a potentiometer to a dremel? [closed]

I bought a cord Dremel a while back for some of my personal projects and it seems to speed up after a minute and the rotary bit I like begins to jump and chips pieces away. I haven't sliced the cord ...
0
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3answers
134 views

Potentiometer - How?

I bought a 5m LED strip from Ebay and connected it to 12V 1.5Amps. I am a starter in engineering. What kind of potentiometer do I need to use to lower or increase the brightness? How many Ohms do I ...
2
votes
1answer
75 views

Maximum rotation speed for a potentiometer?

After a slight purchasing mishap, I am to end up with an encoder whose max RPM is too low for the application for which it is to be used. To achieve roughly the same purpose (that is, sensing of an ...
4
votes
4answers
347 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
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2answers
107 views

How to connect this potentiometer to this PCB?

How am I supposed to connect this potentiometer to the PCB?
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1answer
58 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 ...
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0answers
43 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 ...
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0answers
40 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
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1answer
73 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
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2answers
84 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 ...
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1answer
108 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. ...
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1answer
194 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 ...
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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
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2answers
113 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
176 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
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2answers
66 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
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3answers
128 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
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0answers
51 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
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1answer
84 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 ...
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1answer
86 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
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1answer
50 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
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1answer
84 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 ...
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2answers
97 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
474 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 ...
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0answers
45 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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2answers
228 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
149 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
318 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
943 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
115 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
56 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
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1answer
64 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
187 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
114 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
158 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
111 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
120 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
215 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
57 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
262 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
172 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
100 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
116 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
140 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
1k 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
3k 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
655 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
530 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 ...