Questions tagged [digital-potentiometer]
A potentiometer whose value is digitally controlled.
116
questions
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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 ...
0
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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 ...
1
vote
0answers
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 ...
2
votes
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 ...
0
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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, ...
0
votes
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, ...
1
vote
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 ...
1
vote
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 ...
0
votes
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 ...
-1
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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 ...
0
votes
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 ...
0
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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 ...
0
votes
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 ...
2
votes
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 ...
0
votes
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 ...
1
vote
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 ...
0
votes
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 ...
1
vote
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. ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
-1
votes
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 ...
4
votes
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/°...
0
votes
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 ...
0
votes
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 ...
4
votes
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 ...
2
votes
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 ...
1
vote
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 ...
0
votes
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 ...
1
vote
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 ...
0
votes
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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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, ...
1
vote
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 ...
1
vote
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 ...
0
votes
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 ...
1
vote
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.
...
0
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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 ...
0
votes
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 ...
6
votes
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, ...
1
vote
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 ...
0
votes
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 ...
7
votes
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 ...
3
votes
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 ...
-1
votes
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 ...
0
votes
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 ...
