Questions tagged [digital-potentiometer]

A potentiometer whose value is digitally controlled.

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2
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1answer
87 views

100s of devices on SPI bus with daisy chaining - theoretically possible but who's done it?

I need to control 512 knobs digitally using 128 digital potentiometers. The AD5204 supports daisy-chaining but what do I need to be careful of when interfacing this with a ATmega328P? I plan to split ...
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1answer
55 views

Digipot for 0-9v control

I'm working on a project to control a TIG welder digitally. The dial that changes the main for the welder starts at basically 0v and at the top end gets to 8.52v. I'm currently using an Arduino that ...
1
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3answers
131 views

High resolution angular position (~0.5 degree) measurement [duplicate]

I am attempting to replace a light/mirror sensor to measure the slight low speed oscillations/ rotations of a disc over a period of time. I want to record the angular position, but I wanted to find a ...
0
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1answer
85 views

Is it ok to use digital potentiometers in parallel?

I searched but found nowhere on the web if I can use digital potentiometers like parallel resistors. I.e. the MCP42010 has two digital resistors build in one chip. I have the 10k version but I need ...
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0answers
32 views

MCP4011 - Exposed pad - connect to GND?

I'm planning to use an MCP4011-xxx/MC (DFN version). This package has an exposed PAD. But nowhere in the datasheet, I can find the information if this exposed PAD should remain NC or tied to GND/VSS. ...
0
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1answer
20 views

X9C10X Daisychained

I'm making my own variable bench power supply with the LM338 (driven with negative rail of -1.25 for 0v out) and I want to use an Arduino to control the output voltage. I would like to use the X9C102 ...
0
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2answers
42 views

Automated equivalents of Potentiometers

I am currently working on a project to create an amplifier which can use both physical and digital inputs to change the resistance of a potentiometer. Is this possible without using sliders? I know ...
0
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1answer
76 views

Can I use X9C102 digitally controlled potentiometer on AC voltage?

I am working on a project to make a dimmer using the triac and a photocoupler, and I want to know if I can use a digital potentiometer to regulate the intensity of the light. I know it works for ...
0
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2answers
166 views

Ticking noise from guitar pedal attempt

I am working on a tremolo guitar pedal circuit. A tremolo pedal basically attenuates the guitar signal using a pattern. Most tremolos use a combination of LEDs and LDRs to do this, but since I do not ...
-1
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1answer
160 views

Replicating 0-5k resistance signal

I am trying to essentially replace the accelerator pedal position sensor of an electric car. It's a 0-5k potentiometer type throttle. I have tried using digital potentiometers - MCP41010, 2 in ...
4
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1answer
183 views

Precision Adjustable Voltage Reference

Can a low-cost, low-resolution RDAC and a precision voltage reference by used to make a coarsely adjustable high-precision DC voltage reference? Consider for example the AD5121 7-bit RDAC with ±5ppm/°...
0
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1answer
120 views

Supply an analog circuit with digital control

Tell me please how best to power the circuit which has an analog part and the part which, with the aid of arduino and digital potentiometers, controls the analog part. The supply voltage V(in) of the ...
0
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1answer
116 views

Multiple MCP41010 Digital Potentiometers Work From One CS Signal

tell me please, for example, I control for example any parameter of the sound path of the guitar pedal with the help of MCP41010 and I need to make a dual potentiometer of two single-channel chips for ...
4
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1answer
727 views

Why would a digipot require the voltages on its terminals to be between ground and VCC?

I'm not sure if other digipots are like this, but with the MCP4151, which I'm using, the datasheet says that the "Resistor Terminal Input Voltage Range (Terminals A, B and W)" has a min voltage of Vss ...
2
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2answers
183 views

Buck-converter dynamic output-voltage using digital-potentiometer

I am driving a load at 40 V, 4.8 A, and would like to dynamically change the voltage being supplied to it, ideally creating a 2-40 V range with increments of <0.1 V. To achieve this, I am thinking ...
1
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1answer
152 views

Weird waveform when using potentiometer as volumecontrol

I am making a remote volume control for my TV, as my amplifier only as a physical button. My idea is to control a digital potentiometer with an microcontroller. I have build the circuit shown on the ...
0
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1answer
57 views

Can a MCP4361 digipot have a resistance of 0?

I would like to use an MCP4361 digipot as an adjustable voltage divider with Pin A being 5V, B being ground, and W being Vout. I need the wiper voltage to span the full voltage range, including 0 and ...
1
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2answers
148 views

Buckpuck control with digipot

I'm working with a circuit that should control the intensity of several LEDs using the CTL and REF pins on a buckpuck driver part number 3021-D-E-1000. I'm using an AD5204 digipot configured as a ...
0
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4answers
481 views

Replace Potentiometer With Arduino Controlled Circuit

Background: I recently bought a Scr Voltage Regulator (10000w Ac110v 220v 75a) to act as a motor controller for a hobby project (Figure 1). After taking it apart, I found the Voltage Regulator is ...
1
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1answer
419 views

Is it possible to use a digital potentiometer as a digital rheostat?

With a three-terminal analog pot, you can use the middle and one of the outer terminals for it to function as a rheostat. As it happens, I need a digital rheostat in my circuit but I only have ...
0
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2answers
202 views

How does a digital potentiometer work?

What the title says. I'm curious how exactly a digital potentiometer works. Is it something like a pair of pass transistors like below? simulate this circuit – Schematic created using ...
0
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0answers
147 views

Digital Potentiometer: wiper voltage higher than control voltage

I'm trying to use digital potentiometers, controlled by an arduino, as drop-in replacements for a number of 10k pots in a circuit in a piece of audio equipment. I've been looking at datasheets for ...
0
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1answer
211 views

LT3081 Precision Current Limit Programming

I am trying to precisely control current limit of the LT3081 IC following this paper, page 12, schematic on page 14, but by using a microcontroller. I'm controlling the output voltage with a 10kOhm, ...
1
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1answer
269 views

MCP45HV51 Register does not change

I am using a MCP45HV51 digital potentiometer for gain control. (Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/20005304A.pdf) I set up the device according to the datasheet and control it ...
1
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1answer
264 views

Digital potentiometer, initial (wiper+start position) resistance compensation

In my project I am using a LT3086 (40V, 2.1A Low Dropout Adjustable Linear Regulator with Monitoring and Cable Drop Compensation ) With this voltage regulator you can "programm" the output current ...
0
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2answers
194 views

using the mcp42010 for audio attenuation

I would really appreciate some help here, I've spent a lot of time on this and can't get it right. looking at datasheets and answers here actually made me even more confused... I'm trying to control ...
1
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0answers
112 views

Converting analog CRT adjustments to digital

Many CRTs use analog controls (potentiometers) to adjust various picture settings such as brightness, contrast, geometry, etc. My objective is to replace these analog controls with digital ones. ...
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0answers
77 views

Digital Potentiometer Not Working

I am trying to control an AD5206 digital potentiometer on a PocketBeagle (smaller Beaglebone Black essentially). I have an entry in my device tree for spidev, and I ...
0
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2answers
290 views

Stepping Down Voltage to power DC motor

First post here, it's probably a very easy fix for most of you here. Right now I'm trying to use a digital potentiometer in a voltage divider to step down a voltage from 5v to a range of 3 - 1.5 volts ...
6
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1answer
957 views

Software SPI implementation for AVR

I am trying to implement SPI in software for ATtiny45 (which does not have support for SPI natively). To test one I'm using the digital potentiometer, ...
1
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3answers
125 views

Digital Potentiometer Capacitive Feedthrough?

I am trying to use a digital potentiometer to reduce the amplitude of a square wave. I am getting what appears to be capacitive feedthrough on the rising and falling edges. This is getting amplified ...
0
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3answers
336 views

Digital potentiometer mixing matrix

I need to mix 4 analog inputs with different weights into 4 analog outputs with audio application in mind. This can simply be made using potentiometers and opamps for buffering, like shown on the ...
7
votes
4answers
959 views

Using a digital potentiometer in a voltage divider

I'm using an MCP3008 ADC and an MCP4131-103 (10k) digital potentiometer to try and create a sort of "adjustable voltage divider." For the project, the resistance I'm measuring will vary, and I hoped ...
3
votes
2answers
210 views

Phototransistor with digital potentiometer

As per the circuit diagram below, I'm trying to use a phototransistor with a digital potentiometer so that the sensitivity can be adjusted. PH_TR connects to an ...
-1
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2answers
315 views

Generating 0-10V DAC from 0-5V uC output - Non Inverting Amplifier or VCA?

I want a 0-10 V DAC output but my MCU only has a 0-5 V DAC output. I can't decide which option to go with: Use a Non-Inverting Amplifier circuit (like in the DS3904 Example) OR Use a voltage ...
0
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0answers
241 views

Digital pot leaking and vcc/2 impedance doubt

I have been trying to use a digital pot to control the volume of an audio signal. I am aware that most digital pots don't take negative voltages and also that digital pots have a high wiper resistance ...
0
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1answer
535 views

Digital pot (MCP41100) as LED strip dimmer

I want to be able to dim a led strip with a MCP41100 but I have no idea how to connect the digipot to the led strip... It is connected to an ESP8266. I will have to figure out how to address the ...
0
votes
1answer
534 views

Why is this digital potentiometer working?

I've been working on a circuit to dim a Shop Light that according the manufacturer is 0-10V dimmable. Built into the light is an LED power supply that provides two wires, a purple DIM+ and grey DIM-. ...
0
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1answer
743 views

Digital Potentiometer as PWM Control Input

I'm a programmer who's been put in charge of some motor control problems and I need your help, apologies in advance for the very professional drawing. Anyway, what i have is a PWM control board ...
0
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1answer
88 views

What would i change about this diagram to power and regulate this motor to make this a working model

what if the battery was 12v? would this be a working model? a previous comment suggested a BJT, and to regulate the BJT with a potentiometer.. what is a BJT? i am looking to get as small of ...
-1
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2answers
353 views

What is the best way to set up a potentiometer to run an 18 V battery to power a motor with these parameters?

These are the values on the tech sheet for the small motor I picked up. I just want to be able to have an 18 V battery power the motor, but I would like to regulate it, and would be running it around ...
0
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0answers
391 views

ESP8266 PWM, vary the 220V light bulb intensity

How can I, instead of switching the light on/off, to dim the light using the PWM of the ESP8266 module? I read this related question 5 years old PWM to vary the light intensity of a 220V bulb And I ...
0
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1answer
646 views

Implementing a programmable variable resistor

The R-2R network can provide digital-to-analogue conversion of arbitrary precision using resistances of only two values. Is there a corresponding circuit architecture that switches resistance values ...
0
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1answer
83 views

Change current using PWM, for specific range outside PWM boundaries [closed]

I have a circuit where I use a digital potentiometer (namely MCP41100) to change current, and I use duty between 0 and 255 (thus, I have 256 steps). The current changes from 25 micro to 50 micro. And ...
-1
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4answers
603 views

How can I make a digital audio panning controlled by a microcontroller?

I've been trying to pan an audio signal between 2 speakers, in a way that I could program it to create an autopan effect. It seems an easy thing to do, but I have been struggling a lot with it and ...
1
vote
2answers
84 views

Question about Digital Potentiometers

I was looking at the AD8403 A1 Digital potentiometer to use in a circuit where the voltage on the brush would be 12V and the voltage on the extremities would be 11.9V. Whilst this is way outside of ...
0
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1answer
722 views

Problem with digital potentiometer [MCP41010] in Op-amp Amplifier

I'm using two potentiometer in amplifier design for controlling gain and offset. the potentiometer that used in offset control works perfect. but that one used in amplifier resistor have a big problem....
2
votes
3answers
881 views

Electronically programmable buck converter module

I need a electronically programmable buck converter module. Because I do not trust my skills to approach high-frequency circuits, I thought I would modify one of these very cheap pre-built modules as ...
0
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2answers
235 views

How to fetch the resistor values of AD8403 (digPot) programmatically?

I'm using Arduino to control a digital potentiometer via SPI. I can set the resistor values, but I wonder, 1- Can I read the resistor value also via the same SPI interface? Here is the data sheet of ...
1
vote
1answer
834 views

Digital Potentiometer controlling DC motor speed problem: voltage won't step properly

I'm building a rheometer to measure the viscosity of liquids. I'm using a 4.5-10v DC motor which needs to be accurately controlled by a Raspberry Pi (the speed and torque must scale, so PWM is out). ...