Questions tagged [digital-potentiometer]
A potentiometer whose value is digitally controlled.
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Motorised Variable Resistor part selection [closed]
Background:
I am building a bench power supply from scratch using a Meanwell power supply I’ve got laying around. It’s a 24VDC with 14.6Amp output which is pretty decent for my use. In addition to ...
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AD9833 Function Generator Help
I'm looking to create an AD9833 function generator (and have been, for too long) and keep getting stuck on the hurdle of digital control. I'd like a good way to be able to vary frequency (easy enough),...
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Varying negative voltage from a switching regulator
I've looked up switching regulators with inverting configurations that can give a varied output by setting feedback resistance. Now I want to vary this voltage through a uC.
I didn't find any digital ...
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Digital interface to regulate blender motor
A typical blender uses a universal-type motor which has a knob to toggle between different taps on the field coil for different speed settings. I wish to replace the knob with a touch-screen or a push-...
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Control timing of Monostable Multivibrator
Im having a hard time really understanding a Monostable Multivibrator.
What I'm trying to achieve is being able to control the timing of the vibrator with a microcontroller of some kind. (arduino, pic,...
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JFET or MOSFET for controlling the speed of a compressor (via resistance modulation)
I've recently purchased a 12v compressor with a control unit attached (QDZH35G - usually meant for refrigerators or A/C units, but this is for a DIY project). The speed of the compressor can be ...
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Ideas for digitizing the current control of SZBK07 DC-DC buck converter
I have the popular SZBK07 DC-DC buck converter, which seems to have the following schematics:
The manufacturer gives the following parameters:
Non-isolated, adjustable DC/DC buck (step down) ...
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SPI data format for daisy-chained AD5207 digital potentiometer control
I am working on a project using two daisy-chained AD5207 digital potentiometer ICs controlled by the SPI interface of an STM32 micro. I'm following the directions given on P.9 of the AD5207 datasheet, ...
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Controlling audio preamplifier with a digital potentiometer
I have created an audio preamplifier with THAT1512. As I am not an expert in electronics, I used the circuit designed by DIY Perks. It is supplied with +15V and -15V, similar to the circuit in the ...
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Circuit with resistance equal to input resistance
I want to use a digital potentiometer, however, the digital potentiometer has a power limit, which means I can't apply the voltage for my application.
I am looking for a circuit which functions as an &...
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What is the reason for observing a wiper voltage greater than the A and B PIN of a digital potentiometer?
I am working on a project to implement a variable resistance for high voltage circuit using a MOSFET current sink. The complete circuit is available here.
I am sharing the first page of the circuit ...
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Resistor chain substitute
We have to interface with a device that is expecting a chain of 34 Ω resistors with switches connected to the input pins as shown below.
There is no information on the internal schematics of the ...
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Compensate potentiometer wiper resistance with negative resistance (LM358)
I'm trying to cancel wiper resistance of a 10 kΩ DiGiPot that controls output voltage of a switching power supply. I'm using MCP4131-103 that has 120 Ω wiper resistance @0% pot position. This wiper ...
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Two-digipot (MCP4131) programmable gain amplifier showing negative resistance, not reaching correct amplification
For fun I'm trying to design an epic amplifier with programmable gains from ~1.4 to 256. The opamp being used is a TLV2452.
The digipot A can reach a minimum of 390 Ω. The digipot B can reach a ...
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Isolated power supplies for high-voltage DC
I am currently designing a high-voltage system for electrospinning. I am looking for some advice to address arcing and how to isolate the high-voltage DC from the low-voltage DC.
In my current setup I ...
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Do I need to worry about current when using a potentiometer? [closed]
I have a 12 V, 2 A device. I need to be able to change the voltage for this device on the fly to up to 13.5 V. I am not an electrical engineer so please bear with me.
From what I understand each ...
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Safety circuit to control maximum voltage
I am looking for a way to control an analog signal from another system that changes between 0-1 V.
The user could define the maximum voltage value, for example 0.793 V (the analog signal has ...
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Implementation of a 24 hour variable resistive load fluctuation
I am implementing a DC microgrid with a variable resistive load variation of 24-hours, based on a load profile.
I have implemented it in MATLAB through a variable resistor and a 1-D block to provide ...
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Digital Potentiometer LTSpice Model
I'm looking to simulate a circuit in LTSpice which uses a U/D-style digital potentiometer like the Analog Devices AD5220. Is there an existing component model with this type of functionality?
If not, ...
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Generating +/- voltages for biasing an opamp using a digipot
I am trying to generate a programmable bias voltage for a non-inverting opamp using a digital POT with an up/down interface as putting a micro in the circuit is not feasible.
I have come across a wide ...
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A way to make simple digital potentiometer [closed]
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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