A variable resistor than can be changed mechanically.

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2
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2answers
53 views

Can I use an op-amp in voltage follower configuration as variable voltage power supply?

I see that this works in theory, but I my gut feeling says there is a drawback or caveat of which I'm not aware. Basically what I want to achieve is described best by the circuit diagram below. ...
0
votes
1answer
31 views

Looking for a high temperature potentiometer [on hold]

Does anyone know of any potentiometers that are rated up to 500 degrees F?
0
votes
1answer
44 views

Does anyone make a dual rotary pot/switch with around 8 presets? [on hold]

I would like to add resistance to two lines with voltage around 0-4V. The caveat being that the two resistances must always be within a very low tollerance. Ideally, I would like one rotary pot (0 to ...
0
votes
1answer
53 views

Dual Dc regulated voltage circuit design

I'm working on my term project which is designing a dual DC regulated voltage that gives a DC voltage between +or-ve 3 to +or-ve 15. I have completed the testing for positive DC output part, but I ...
0
votes
0answers
30 views

Rheostat and how ohms affect them

I have a two welding machines with the same problem. The rheostats, Ohmite 1.5Ω, 5.77 amps, are damaged. The replacement cost from manufacturer are $100 each. After searching on ebay I found some ...
0
votes
2answers
52 views

How to regulate voltage into two variable outputs?

I'm thinking of building a control voltage generator for a synthesizer. Basically I want to control two pitch control voltages with variable resistors, something like this: R1 needs to control only ...
0
votes
2answers
41 views

Potentiometer with No Minimum Resistance

I'm looking to create a variable current regulator with the LM317 using 1-turn pots. I know that I am going to need to have a resistance of 1.25 Ohms to have a current of 1A, which I want to be my ...
0
votes
1answer
63 views

Use Potentiometer to change frequency in FM Radio Transmitter

I know that in most circuits you use a tank circuit consisting of an inductor and variable capacitor in parallel to generate different frequencies like this one. However since most cheap trimmer caps ...
0
votes
1answer
43 views

DIY Photobooth: LED puck lights potentiometer suggestions

I'm building a Raspberry Pi powered photobooth, and want to add some lighting. I purchased this set of led puck lights, and would love to control their intensity from the Raspberry Pi, instead of the ...
-1
votes
3answers
62 views

Calculate resistors value in voltage divider

I have the following voltage divider circuit with a potentiomenter, and I need to find the value of the resistors. simulate this circuit – Schematic created using CircuitLab How can I ...
0
votes
0answers
54 views

Circuit with “output” resistance as a linear function of “input” resistance

TLDR: How do I make a 6.8kΩ to 20.0kΩ potentiometer look like a 10.5Ω to 19.7kΩ potentiometer when presented with 3.3 volts? I'd like to make a mod for a MIDI controller. Through some probing I ...
1
vote
0answers
48 views

Will this potentiometer control this led strip?

So first off I'd just like to say i know absolutely nothing about electronics. I want to add some lights to my computer case, will this work as a dimmer? 500K 1/2W Linear Taper Potentiometer White ...
0
votes
1answer
50 views

How to offset input voltage of any op amp

There are some op amps that allow nulling of input offset voltage by provding decidcated inputs where, typically, a potentiometer is connected for the offset correction. My question is that if a op ...
0
votes
0answers
27 views

Will my potentiometer provide enough amperage for my h bridge?

I am sending pwm requests to my H-bridge from an arduino. Each pwm signal is a precise so I need to have the h bridge drive it by that specific amount. I want to use 5V for the h bridge supply, so i ...
0
votes
2answers
80 views

How do I use a 5 pin potentiometer?

I have a 5 pin trim pot I desoldered from an old board. I am assuming maybe it is a dual gang poteniometer or something with a common ground pin. Does anyone have any ideas what the actual pinouts ...
4
votes
3answers
125 views

Simple ADC alternative by using a capacitor and digital Arduino pin

I'd like to measure a dozen potentiometers with an Arduino UNO. Unfortunately, the UNO only has 6 analog pins, but it does have about a dozen digital pins. Could I effectively measure an analog value ...
0
votes
1answer
50 views

DC motor as a generator as a torque limiter?

Is it possible to use a DC motor as a generator to regulate applied mechanical torque? A hypothetical situation: I have a DC motor acting as a generator attached to the ceiling. The motor shaft has ...
0
votes
1answer
60 views

Operational amplifier with potentiometer

Given an op-amp circuit with the shown potentiometer. How does one come up with the following gain equation? Also, when the potentiometer is turned up halfway, why is R3 6.12K, instead of 1.12k ...
18
votes
4answers
2k views

Do ‘wiperless’ potentiometers exist?

Potentiometers are renowned for wearing out (at least in my experience); the little wiper eventually just wears its contact and nolonger has a firm electrical connection. For an audio device, this can ...
0
votes
3answers
66 views

Controlling the power from a 9V battery with a potentiometer

I'm working on a project where I'm powering an LCD screen backlight via a 9V battery. As it is currently, I'm powering the LCD via a 9V battery. This works great, but I'd like to have the ability to ...
2
votes
3answers
332 views

3 leg potentiometer - what's the 3rd leg for?

In a potentiometer, I often see the 3rd leg connected to ground. I understand exactly what a potentiometer is physically (a wiper along a log or linear resistance), but I don't understand the benefit ...
0
votes
1answer
68 views

Do potentiometers exist that include DPDT switches at the limits?

Do potentiometer packages exist that include 2 double-pole double-throw switches, one of which is switched at the lower limit, the other switched at the upper limit? (Preferably with tactile clicks.) ...
1
vote
1answer
71 views

Controlling fan speed with a rheostat

I just got a rheostat from radio shack to connect to my homemade stir plate. The rheostat looks like: (from here) My question is, how do I set it up? I want to use it to vary the fan speed. I am ...
0
votes
1answer
112 views

How to shift resistance range of Linear Potentiometers by X ohms in the Positive or Negative direction?

For example, I have a 10k ohm (linear) Thumbwheel Potentiometer. This POT will produce values from 0 to 10k when reading its resistance. Positive Shift How do I shift resistance range values by X ...
1
vote
2answers
92 views

Explanation for super-sensitive loose contact inside potentiometer?

Symptom I have a mixing console, where one 6-pin stereo pot is errartic. When I turn it all the way down I sometimes can still hear the left channel at full volume. Explanation The circuit is a ...
1
vote
2answers
54 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. ...
0
votes
0answers
43 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 ...
1
vote
1answer
63 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
votes
3answers
142 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
84 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
633 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
2answers
150 views

How to connect this potentiometer to this PCB?

How am I supposed to connect this potentiometer to the PCB?
0
votes
1answer
130 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
67 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
42 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
106 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
95 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
173 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
332 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
62 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
121 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
278 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
97 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 ...
-1
votes
3answers
163 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
55 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
102 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
98 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
69 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
107 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
99 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 ...