A variable resistor than can be changed mechanically.
-2
votes
2answers
127 views
Advice on fixing laptop volume knob (potentiometer) [closed]
bsd
My laptop's volume knob has been "scratchy" for some time. I have read on The Internets that Deoxit is a good solution for this problem.
Usually, it is advised to take the device apart to apply ...
0
votes
1answer
215 views
Can I use diodes as part of a circuit to multiplex several analog signals?
The micro controller I am using (AVR) only has 1 ADC port, but I have 6 analog peripherals, essentially potentiometers. Since I want to use these 6 different signals on 1 pin, I thought about a design ...
0
votes
2answers
257 views
Rotation sense of a potentiometer
I've been making an audio amplifier, it works well so far after getting the correct components. I'm using a 10K potentiometer with switch for the volume but I've got a problem. The potentiometer ...
2
votes
3answers
948 views
Can I use a potentiometer to reduce sound level in a speaker?
I want to reduce the level of sound in a speaker (i think 6Ω 30w rms). I wonder if it is that simple to put a potentiometer in one of the cables.
If this can do the trick, how do I calculate the ...
3
votes
3answers
539 views
What type of glue would you use on set potentiometer screws on a PCB?
I want to set my potentiometer screws and then glue them in place so they will not be readjusted by the end user and I have seen green adhesive on them before? Any suggestions as to what is best to ...
2
votes
2answers
4k views
How to make my own volume control for headphones?
I have headphones that don't have volume control built in on the cable, so I thought why wouldn't I try to make one? However, I don't know where to start.
Is it enough to just use a logarithmic ...
2
votes
2answers
2k views
How can I make my own potentiometer?
I want to create my own potentiometer for a project. Part of the reason is because I believe it'll be more adapted to my needs but I must admit that it seems like something really fun to do.
I've ...
0
votes
2answers
6k views
Potentiometer to change voltage?
How can we use potentiometer to regulate voltage form o-5v?
That is, if we rotate the potentiometer it will give some voltage variation as output.
If there any circuit available please let me know ...
6
votes
4answers
902 views
What's the automatic equivalent of a variable resistor?
please forgive the newbie question!
I have a circuit which controls the volume on a speaker by a wheel which is attached to a variable resistor - I want to reproduce this but instead of using a ...
0
votes
2answers
258 views
Digital potentiometer size
I need to replace a 5k mechanical potentiometer with a digital one. The hang up is that it will have a maximum of 14V across it. That's too high for most digital pots on the market. The max current ...
9
votes
6answers
2k views
Is it a good idea to use potentiometer to measure angle?
I'd like to measure an angle between two elements on hinges using arduino. Can I use a rotary potentiometer?
If I take reading at two edge positions for calibration (0 and 90 deg.) can I assume that ...
1
vote
2answers
577 views
what's the cheapest/fastest way to put a potentiometer on an ac fan?
I'd like to control a couple ac fans running on mains voltage (US) using a potentiometer. I believe they're in parallel but I'm not certain. Each fan is rated at 15/13 watts @ 115 volts
What's the ...
1
vote
1answer
242 views
How could I create a high-precision voltage with the atmega128?
In my solution i have to replace an 10 turn potentiometer ( 5 K Ohms ) with a digital circuit. the potentiometer is dividing a voltage between 4v to 21v. so it seems if i could generate a voltage ...
4
votes
4answers
860 views
Bi-directional potentiometers
Is there such thing as potentiometers that have a low resistance when centered and increasing resistances if you turn either left or right?
Edit: When i say centered, i mean that the pot is at zero ...
0
votes
1answer
193 views
Potentiometer current rating
i am trying to control intensity of a 20-50W halogen lamp operating at 24V through a POT. my concerned is current passing through POT (which would be between 1A to 2.5A). what kind of POT should i ...
1
vote
3answers
710 views
Potentiometer vs. Transistor
From what I know, potentiometers vary an analog current with an input usually in the form of a knob. And transistors vary an analog current with an input in the form of a smaller current.
Is there ...
2
votes
2answers
307 views
Potentiometer values don't add up
I'm working on a project that involves swapping out a couple of pots of a circuit board for a couple of digital potentiomters. I'm trying to make sure that I'm using the right resistance values, so ...
3
votes
2answers
587 views
Where do I find USB controlled digital potentiometers sampling a wide array of values?
I am looking for a set of digitally usb-controllable potentiometers sample a range of resistances from 1 kilo-ohm up to 1 mega-ohm in ideally both linear and audio (logarithmic) taper. Here are some ...
2
votes
2answers
2k views
Arduino PWM vs. Potentiometer
I have one of these ancient Mentor game stations with the game tennis (Pong). Instead of using the controllers with a poti I'd like to use the Arduino PWM port to set a voltage between 0 and 5 Volt. ...
6
votes
2answers
2k views
What's the difference between a potentiometer and a rheostat?
I've seen that a number of schematics will connect the center (common) pin of a potentiometer to one or the other leg, and it then functions more like a rheostat. Is that how a rheostat is wired ...
7
votes
4answers
865 views
Different ways to digitally control an adjustable SMPS
I want to make a battery powered, adjustable SMPS for use in situations when I cannot have an outlet near me, so I would like some more information or suggestions about this topic. The SMPS chip I am ...
1
vote
3answers
235 views
How to use AD 676 Analogue to Digital IC
I want to measure degrees using linear potentiometer, so I thought to use the AD 676 analogue to digital converter (ADC) IC.
Is this a good ADC for monitoring a potentiometer?
If so, how can I ...
3
votes
7answers
843 views
how to drive a 1.35V led with a 1.4V AA battery
I would like to mount a TSAL6400 led on a single AA size battery box, with a simple ON/OFF switch. My problem is that the LED needs exactly 1.35V to function at its rated brightness. At this voltage ...
1
vote
3answers
398 views
multi turn potentiometers to measure degrees
I want to display degrees in a seven segment display when rotate multi turn potentiometers.After rotating one round it should be reset to 0 degree.I can use A to D converter ICs.But how I give ...
1
vote
2answers
929 views
Which potentiometer to chose for LCD screen contrast?
I recently obtained DEM 16217 SYH-PY 2x16 character screen. Here's the datasheet. As far as I can see, its contrast pin should be connected to voltage source over a potentiometer. How do I pick ...
1
vote
3answers
835 views
How to wire a potentiometer to an ADC for low power
I'm designing a microcontroller based device which spends most of the time in deep sleep.
Every 10 seconds it wakes up, reads a potentiometer connected on an ADC line then goes back to sleep. My aim ...
2
votes
7answers
1k views
Are there any special tools used to adjust trimmer potentiometers?
Is there any special tool used to adjust trimmer potentiometers?
I have some similar to the one on the picture:
I've tried using small slot, Phillips and Pozidriv screwdrivers, but they all don't ...
2
votes
2answers
228 views
Meaning of potentiometer torque measurements
I've got a Chinese pot datasheet, and the rotational torque is listed as "20~200gf.cm".
This Bourns datasheet lists
Rotational Torque ............. 10 to 150 gf-cm
Why such a wide range? Is ...
0
votes
3answers
394 views
Using a digital potentiometer with a SMPS?
Is it possible to use a digital potentiometer with an SMPS, to adjust the voltage? I'm looking at one with a 2 MHz -3dB bandwidth. What does this mean for a 300 kHz switcher?
3
votes
5answers
304 views
Potentiometer that goes to zero
Is there a special name for a potentiometer whose A-W or B-W resistance can drop to zero? I have a 1k +/-10% pot and I can only vary A-W or B-W resistance from 118 ohms to 1.2k. Note A, B refer to the ...
3
votes
2answers
994 views
Is there any way to determine power rating of a potentiometer?
I salvaged a 1kΩ potentiometer from a broken circuit. Is there any way to determine how much power can it take without destroying it?
EDIT Picture of the potentiometer:
The distance between ...
3
votes
4answers
536 views
In the case of audio, would it be accurate to think of a potentiometer as a fader between two inputs?
I kinda already asked the question in title, but I will reiterate --
...
2
votes
1answer
178 views
Telephone line acceptable path loss?
I'm trying to dig up the "rule of thumb" value for what a telephone company would consider acceptable path loss when they run a new line out to a customer. I spent a lot of time in digital telephony ...
6
votes
3answers
1k views
What's the best way to plot the “taper” of a potentiometer circuit?
The problem is designing gain/volume/pan/balance/crossfade/mix controls with a smooth "law" or "taper"; the rate at which the audible volume changes as you turn them. (Described in The Secret Life of ...
