A variable resistor than can be changed mechanically.

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2answers
38 views

Audio Taper to Linear Potentiometer

I'm trying to linearize the output of an audio tapered potentiometer. Right now, I'm using ADC on a Beaglebone to read the value of a 250k potentiometer with 3.3V. I get a value between 0 and 1, but ...
0
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0answers
27 views

Spice-Potentimoter Plot… How to plot output voltage vs wiper position

Determine and graph a relationship between the output voltage and the potentiometer wiper position, which corresponds to the distance y. Assume that y changes from zero to 1 (for the top position of ...
0
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2answers
41 views

DC High Voltage Line Splitting Problem (Electrode “Tuning” Application)

I am having trouble coming up with a solution to a problem engineering a DC circuit that can take a single line input (Vin) and split into two outputs (Vout1 & Vout2). The goal of the circuit is ...
0
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2answers
66 views

audio-taper potentiometer in 50-100 ohm range [closed]

Anyone know where to source an audio or logarithmic taper potentiometer in the 50 or 100'ish ohm range ? Mouser and Digikey don't show anything, even non-stocked. I'd like to build an adjustable ...
0
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3answers
53 views

How can a pot allow variable off times in a time delay relay

I have a pellet stove motor that cycles on when an external potentiometer is dialed on. The run/on time period for the motor is always fixed--about 5 seconds, and then it pauses for a period ...
2
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2answers
44 views

Where can I use my ammeter to measure the current set by the current limit potentiometer?

Here is the circuit in question: (http://i.imgur.com/Jmo6mzL.png) The circuit is an adjustable power supply that I have put together (can be bought here) and I am working on putting it all together ...
0
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1answer
34 views

Information regarding old AB (Allen bradley) potentiometer JAIN056S102MA

i was looking for information (datasheet) regarding this old potentiometer from 1962 on the internet, JAIN056S102MA type J, 1k-ohm from Allen Bradley and i was not able to find any information about ...
3
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2answers
136 views

What are the terminals in this 6 pin potentiometer?

I want to use my 6 pin potentiometer in circuits so I want to know what all the terminals are for. I know the basic principle in the 3 pin pot. I'm completely new so please answer it in simple terms. ...
0
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5answers
74 views

Is it possible to use a potentiometer as a DP3T style control?

I'll try to be specific: I have an audio application that has 3 inputs and 1 output. The classic answer would be to use a DP3T to switch between the inputs. However, I would like to have a ...
0
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1answer
64 views

Is this something a P.L.C. would be able to do?

I wish to replace the zener diodes with a programmable chip, so that I can program the chip to do exactly what the zener diodes do in this circuit. This will then make the circuit universal to all my ...
-1
votes
1answer
36 views

Looking for a replacement for a potentiometer [closed]

I am looking for a replacement for this potentiometer. I did plenty of googling but can't seem to find anything that remotely matches the model. The numbers on the bottom say: B103-32-8(dot)-KP
0
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3answers
115 views

zener diodes, different voltages, and using a relay to control its opperation…will this work?

Ok so I am going to admit that I am an idiot when it comes to circuits. However, some advice would be appreciated with regard to my idea. I am trying to control two seperate circuits, each with ...
0
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0answers
60 views

digital variable potentiometer or digital variable resistor

I own an old electric motor machine with an old driver which varies velocity using a 1k-ohm potentiometer, i do not want to change driver, i want to substitute the potentiometer using something like a ...
0
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1answer
63 views

Creating a blinking circuit (sensor probe)

I'm a veteran of electronics with little knowledge if that makes any sense at all. I've dabbled in electronics for about 12 years now, and have had so much going on in life that I've strayed away from ...
3
votes
3answers
76 views

Why changing the potentiometer affects the whole circuit?

simulate this circuit – Schematic created using CircuitLab I have the following simple circuit where the potentiometer is used as a rheostat. 9V battery (-) --- 0.470K Resistor --- LED ...
0
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0answers
71 views

Constant current source - unexplained issues

I have been puzzling over this for days now, and cannot for the life of me figure it out... I have a constant current source set up to use as an analog dimmer for my LM3429 LED driver. I have made ...
1
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1answer
77 views

10k potentiometer symbol meaning?

i am trying to map this schematic onto a virtual breadboard but i dont understand what the 10k potentiometer symbol represents. am i supposed to connect the 5v terminal to the positive end of a ...
0
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3answers
99 views

Make a transistor act as a potentiometer

So, how would one get a transistor (probably BJT) to act somewhat like a potentiometer? What I trying to do is have xl6009 buck boost regulator be electronically controlled to charge a li-ion battery ...
1
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0answers
38 views

Use a potentiometer in place of a 4 position rotary switch?

I have a little oil heater in my house that is on the fritz. Its "Off-High-Med-Low" switch is just basically gone. While I might be able to dig out another switch from some of my electronics junk, I ...
2
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2answers
74 views

LM317T Hookup with 2K trimmer

I tried several times but without success to get the trimmer changing the output voltage of the LM317T . I tired to link the Pin 1 and 2 then all goes to ADJ pin of the LM317T and pin 3 to ground or ...
0
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1answer
49 views

Explain trim pot for VU meter

I have the following schematic that is supposed to rectify the signal going to a VU meter and also trim it, so the user can adjust the position of "0dB". What I don't understand is why and how the ...
1
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2answers
66 views

Drop the current of a couple of peristaltic pumps for a microscope use

I have a system to drive two peristaltic pumps (labelled 12V, that draw 300mA) in a microscope in the lab in order to refresh the media of my cells for long term experiments. In the current setting ...
0
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3answers
84 views

Potentiometer identification

I'd appreciate some help to identify a potentiometer. It's from a small handheld drill and there is no reading on an avo across the two outer terminals so I'd like to replace it if I can find ...
2
votes
3answers
135 views

How to limit current in order to power small car radiator fan with laptop charger?

I'm trying to do a makeshift small grinder/sander out of a car radiator fan, but I want to power it up with a laptop charger for convenience. Since it's a salvaged fan, I wasn't able to look up its ...
0
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3answers
98 views

Linear output voltage using a potentiometer

I would like to use a linear 10K potentiometer to have a variable voltage output between 0 and 5V using a 5V input. The idea is to have the output voltage increase in a linear way as I'm turning the ...
0
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1answer
72 views

Is there a reason for potentiometers to be the moving part on a rotation sensor (joystick)?

I recently dug up an old joystick (Trust Predator) to see if my old flight simulator install would still work. The joystick however didn't work at all satisfactory (erratic behaviour and drifting) so ...
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votes
1answer
170 views

Need help putting two potentiometers in series? [closed]

I'm currently doing a project to control the speed of a dc motor, I'm on a budget and trying to find parts that I have. I have found two 50k potentiometers that I would like to put in series to add up ...
-2
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2answers
86 views

Transistor Familiarization

Having trouble with this problem . Where will be the end of the arrow on the transistor be connected (upper right) ..
0
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2answers
29 views

Adjusting the Potentiometer into Acquired Value

The goal is to find the base current, collector-emitter voltage- and the base-emitter voltage for each of the values.. My problem is, how am I gonna adjust the potentiometer into 0.2 , 0.4 up to 2.0 ...
0
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2answers
182 views

Some Basics of a Potentiometer?

This is my first DIY wiring project, I'm taking an RGB LED and using four potentiometers to control (1) overall brightness, and (3) each color level. Wanted to make it simple. For my purposes, all ...
1
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1answer
65 views

S-curve using linear potentiometer without huge power drain

The following circuit uses a linear potentiometer and two resistors as a voltage divider to create a very steep non-linear S-curve as the potentiometer is adjusted. However, the low resistances ...
0
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1answer
86 views

Can I use a Potentiometer to reduce 18vdc to 14.5vdc for a 36W filament?

Thanks in advance for anyone who can help me with my specific question! I have many 18v Li-on battery packs (1.5Ah-4Ah) due to the other tools that use this voltage, and I am making a lamp using a ...
0
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3answers
97 views

How to emulate potentiometer to control electric vehicle?

I'm trying to control an electric vehicle, say scooter. Vehicle throttle meant to be controlled with potentiometer like on the picture. And it works just fine with 10K pot. Now I want to control ...
1
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2answers
78 views

Amplify a potentiometer section

i've been looking for a replacement 5k potentiometer for a mobility scooter. they have 312 deg mechanical rotation but only 45deg electrical spread, so the center 45 degrees are 4ohm-5kohm. they are ...
1
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4answers
448 views

How does the microcontroller read potentiometer resistance as integer without regard to potentiometer value?

When I hook up a 5k rotary potentiomoeter to the analog input pin of a microcontroller it will read values from the pot as integers 0-1023. If I switch the 5k out for a 500k the microcontroller will ...
-1
votes
4answers
106 views

Do all digital potentiometers have discrete resistance options?

I'm looking at the MCP4017 and some others, but they all seem to have discrete resistance options. The MCP4017 offers 5k, 10k, 50k and 100k. Are there digipots out there that offer a continuous ...
0
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1answer
51 views

How do I wire these potentiometers?

I'm trying to make this circuit (components in question are R10 and R11). I have two really nice sliders I bought from Science ...
0
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2answers
57 views

Differentiate Value of Unmarked Potentiometers

I am constructing a signal generator using a kit. Upon soldering it together, I have encountered a problem. The board is marked with two potentiometer slots, identical except for the values named on ...
0
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1answer
123 views

Volume control with DS1807 digital potentiometer?

I'm making a digital synth for a project and I need to wire in an Arduino-controlled volume circuit. Right now I'm outputting a 0-5V audio signal and cutting it down to a pure AC 0.5V signal with a ...
-1
votes
2answers
130 views

How to combine 2 potentiometers together?

I have 2 amplifiers and each has its own variable volume pot on them to control the audio volume. How can I wire both of those to a single pot that will work with both?
1
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3answers
294 views

If a potentiometer is basically a voltage divider, why are they made in different values?

I was taught that rheostats are current based devices, while potentiometers are voltage based. I can see why rhostats come in different values (eg making variable loads of different magnitudes), but ...
0
votes
2answers
59 views

Reading Pot w/out ADC or OPAMP [closed]

There was a page on the interwebz once, and it had code (and schematic) for reading an RC ciruit (no op-amp or ADC!) where one of the R's was variable-resistor (LDR, pot, etc.). However I can't find ...
0
votes
3answers
136 views

120v 1,500w heater: is the temperature control knob most likely a standard potentiometer?

Are the temperature adjustment knobs on most high-power AC (infrared or radiant) heaters just standard potentiometers, the same that would be found in low-power DC devices? I'm asking about the knobs ...
0
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3answers
211 views

Speed Control for a 12v DC PC Fan for Magnetic Stirrer

I working on mini project to create a magnetic drink stirrer out of an old PC Case Fan. (For those that don't know, a magnetic stirrer is basically a spinning magnet under your glass and a magnetic ...
0
votes
2answers
172 views

How to change speed of dc motor using potentiometer?

I want to change the speed of a DC motor(12V,2000RPM) using a pot and operate a table fan(where I've replaced its AC motor with DC).Now the problem is I get a regulated output at o/p of 7812 but not ...
1
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2answers
43 views

Cermet potentiometer temperature coefficients

I'm engineering a system that is temperature-sensitive, between ~-10-30C. I've moved to using cermet potentiometers because of their sub-200PPM/C temperature coefficients. If I wire such a pot with ...
1
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2answers
127 views

Hi-Fi Stereo Amplifier gain regulation with potentiometer

This is my first question ever so please don't kill me :) I have built a stereo hi-fi (end) amplifier 2x10W based on a IC TDA2009. I have bought it as a construction (learning) kit ready to solder. ...
0
votes
1answer
104 views

What's the usage of this type of biasing?

I'm trying to know What's the usage of this type of biasing BJTs. this is the main schematic. I'm talking about these type of biasing: Another question to me is this type of biasing for ...
0
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0answers
46 views

Change range of output values of potentiometer

I would like to use a fuel gauge in my car that expects 240 Ohms when the tank is empty and 33 Ohms when full. However, my current fuel sending unit reads 168 Ohms when empty and 34 Ohms when full. ...
0
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3answers
75 views

Reading a potentiometer with an unknown voltage

I have a potentiometer that ranges from 0-400kΩ. One pole is connected to a supply of unknown voltage (but it's in the neighborhood of 12-14V: it's a vehicle power supply). The other pole is ...