Questions tagged [digital-potentiometer]

A potentiometer whose value is digitally controlled.

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A way to make simple digital potentiometer

I am making a project which has an audio application with a TDA amplifier. To change the volume I have a potentiometer on the input of the amplifier so when you change its value the sound is higher or ...
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Would a digital potentiometer be viable to control a OKL-T/6-W12P-C?

I have a few on hand and I would like to control the output voltage with an arduino. Maybe with a digital potentiometer, but the datasheet calls for fairly strict wiring with short leads and little ...
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Is there a better way to determine the resistance of a digital potentiometer than measuring resistance directly?

Project: I'm working on a calibration project that will use a digital potentiometer acting as a shunt resistor for a piezoresistive accelerometer. I'm trying to confirm the values of resistance for ...
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How would a fast moving slider of a potentiometer affect reading?

I understand that the length of the conducting wire/object is directly related to the resistance to the passing electrical current. This is pretty straightforward to understand. But, I wonder, what is ...
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What is a proper circuit for a variable low pass filter that can be controlled with a potentiometer?

I have some 100k digipots (MCP41100) and I want to make a lowpass filter controlled with an ATmega328P. I want a variable cutoff between 20 Hz - 20 kHz with unity gain. 1st order is enough, but it can ...
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Is my test circuit correct for digipot DS1804?

I want to test my DS1804 digital potentiometer on breadboard. Ohmmeter shows about 25 kohm between H and L or W. I thought it will go down with this circuit when I push button but it doesn't work (...
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How can i convert my PWM signal into digital pot? [closed]

I have a PWM signal and i wanted to control a high voltage by changing the Feedback resistance of that power supply using optocoupler. But its not working. So i am thinking to convert it into analog ...
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Replacing analog potentiometer with digipot for DC motor speed control

I have a device with a beefcake DC motor controller like this one: https://www.bodine-electric.com/products/dc-controls/filtered-pwm-dc-basic-speed-control-open-chassis/0780/ The speed is controlled ...
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2 answers
473 views

X9C103 10k digital potentiometer with LM317 0 - 20 V DC voltage source

I need some help about my current project. I am trying to do a voltage source which can be controlled remotely (0 - 20 V). I am using LM317T for this project. I examined the LM317T datasheet and ...
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Digitpot sequential power up

I am using an MCP41HV51 digipot IC to convert digital signals from an STM32 board to analog voltage. The datasheet states that the control circuit of the IC need to be powered up first, then the ...
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EV controller output signals

I am designing an electric vehicle controller for a university project. The motor driver varies the speed according to an analog voltage (0V-12V). My queston is, should I use a digital potentiometer ...
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1 answer
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How do digital potentiometer data sheets define maxmimum power disipation?

I am new to digital potsentiometers, but I would like to use one in a design. I have been looking at several digital potetiometer datasheets and I kind of expected to see some kind of maximum power ...
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Controlling wave amplitude by arduino

I built waveform generator using AD9833. It can produce sine and triangular wave with amplitude about 1.6 V and square wave with amplitude of 4.5 V. I'm searching for some circuit which can control ...
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Value of digital potentiometer when not powered

I have a circuit where upon startup, it selects a voltage source with a programmed current limit via a resistor. Though I want a uC down the line to change this when it first powers up to protect ...
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AD5242 to generate a current source

We are trying to program the potentiometer with I2C using Arduino Due. The SCL-SDA of AD5242 are connected on the SCL-SDA (D20-D21) of the Arduino. We are using MATLAB to program and operate the ...
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Replacing an analog pot with a digi pot in a flying drone controller

I'm working on a project at the moment and I'm supposed to change the analog pot on the controller with a digi one. My question is does installing the digi pot changes anything in the controller ...
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Digitally controlled potentiometer X9C103P gives erratic resistance measurements

I have a digitally controlled potentiometer (DCP) X9C103P (datasheet) which I am trying to operate. Following are the pin connections I've made refering to its datasheet: Pin 1: INC (resistance ...
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334 views

Rotary encoder causing ripple noise on digit potentiometer

I am using a rotary encoder to control the value of a digital potentiometer, specifically the MCP41HV51. I have a 9V supply feeding a 5V linear regulator. My logic supply for the digit pot is the 5V, ...
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2 answers
1k views

Audio: Digital Potentiometer is Noisy Compared to Analog Potentiometer

I am building an A/V switch that I would like to have a headphone output with adjustable volume, controlled by a microcontroller. As a test, I connected an audio source to a potentiometer (input to a, ...
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1 vote
3 answers
237 views

Analog voltage control via Microcontroller

I have a BLDC motor driver that's powered at 24v DC. The control for this driver is via a line that modulates speed based on the voltage applied (between 0 and 24v) so a voltage divider using a pot ...
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1 answer
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What's the best way to control DC current in a circuit from 1mA-20mA at 15-30V input with a microcontroller?

I’m trying to create a circuit for iontophoresis that I can control the current of with a raspberry pi or eventually a microcontroller. What would be the best way to control the current? ...
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2 answers
197 views

Decoupling capacitor for digital potentiometer

I'm designing a circuit that contains an AD5206 digital potentiometer. I'm using a single 5V supply and the IC has both GND and VDD pins tied to ground. The data sheet does not make any ...
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1 answer
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Component / Circuit for variable resistance (0, 5K, 100K) at 110V and 1.5Amps @ 0Ohm

I am searching for a circuit or component, lets call it IC1, which can deliver varieieng resistance with zero capacitance for a power output. When IC1 has 0 Ohms, there will be 110V and 1.5AmpsMax ...
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How to fix zipper noise

I'm building a device to control the level of an audio signal with a digital potentiometer controlled by a microcontroller. The digipot I started with is a Microchip MCP4251. The problem is that ...
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1 answer
231 views

Is the current through the MCP41010 digital potentiometer independent from its supply voltage?

In the datasheet it says that the maximum wiper current is 1mA. Does this mean that regardless of the supply voltage and the set resistance, I can pass a maximum of 1mA through the resistor? Let's say ...
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305 views

Controlling 10k ohm digital potentiometer IC using NI DAQ USB6001

I am totally new to the DAQ system; used to work on Arduino. For the requirement of a project, I have to control a digital potentiometer of 10k ohm (AD5245) using NI DAQ USB 6001. How do I ...
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1 vote
2 answers
426 views

Programmable gain non inverting amplifier

I'm a hobbyist and like to design my own tools rather than buying chinese "kits" that teach nothing. I have been needing all sorts of amplifiers for different things and usually I would just use an ...
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1 answer
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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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1 answer
198 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 ...
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1 vote
3 answers
295 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 ...
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279 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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1 answer
135 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. ...
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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 ...
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2 answers
51 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 ...
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1 answer
145 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 ...
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2 answers
519 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 ...
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1 answer
584 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 ...
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4 votes
1 answer
300 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/°...
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1 answer
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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 ...
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1 answer
258 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 ...
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4 votes
1 answer
877 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 ...
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2 votes
2 answers
886 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 ...
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1 vote
1 answer
265 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 ...
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1 answer
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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 ...
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2 answers
328 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 ...
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4 answers
2k 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 ...
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1 answer
1k 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 ...
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2 answers
516 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 ...
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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 ...
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533 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, ...
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