Questions tagged [digital-potentiometer]

A potentiometer whose value is digitally controlled.

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1answer
38 views

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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0answers
44 views

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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22 views

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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0answers
26 views

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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1answer
166 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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2answers
335 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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3answers
100 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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1answer
76 views

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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2answers
77 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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1answer
47 views

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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3answers
290 views

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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1answer
93 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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3answers
160 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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2answers
263 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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1answer
240 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
118 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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3answers
206 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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1answer
180 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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1answer
64 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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1answer
28 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 ...
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2answers
44 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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1answer
121 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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2answers
356 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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1answer
391 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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1answer
257 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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1answer
188 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 ...
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1answer
215 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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1answer
825 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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2answers
623 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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1answer
230 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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1answer
70 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 ...
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2answers
248 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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4answers
1k 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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1answer
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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2answers
435 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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0answers
279 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 ...
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1answer
437 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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1answer
553 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 ...
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2answers
544 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 ...
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2answers
441 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 ...
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0answers
165 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
125 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 ...
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2answers
588 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 ...
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1answer
2k 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, ...
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3answers
250 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 ...
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3answers
676 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 ...
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4answers
2k 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 ...
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2answers
456 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 ...
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2answers
537 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 ...
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0answers
294 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 ...