This component can control tons of circuits! Digital Potentiometer Guide!
video description
Date: 2021-11-21
Related videos
Comments and reviews: 10
Dani l
I have been looking at these components for a while as I could use them, but I'm amazed at the amount of money they dare to ask for such a simple part: An X9C103 sells for about 5. At those prices, I'd rather use an old fashioned transistor as variable resistor and say bye bye. It's not ideal: Because transistors are designed to amplify (i. e. low resistance) and you want to create resistance, you are forced to send very tiny currents through them to get reasonable resistances and you need to calibrate the microcontroller to compensate against manufacturing tolerances of your transistor, but it works. Transistor, two resistors and a ceramic cap cost about 0. 05, that's 100 times cheaper and worth the slight annoyance.
reply
I have been looking at these components for a while as I could use them, but I'm amazed at the amount of money they dare to ask for such a simple part: An X9C103 sells for about 5. At those prices, I'd rather use an old fashioned transistor as variable resistor and say bye bye. It's not ideal: Because transistors are designed to amplify (i. e. low resistance) and you want to create resistance, you are forced to send very tiny currents through them to get reasonable resistances and you need to calibrate the microcontroller to compensate against manufacturing tolerances of your transistor, but it works. Transistor, two resistors and a ceramic cap cost about 0. 05, that's 100 times cheaper and worth the slight annoyance.
reply
Paul
Did he just prevent some university students from spending time building a custom microcontroller compatible buck-boost converter and showed a simple hack to convert any buck/boost converter that can be controlled by an Arduino!
YES, HE DID!
Great video as always!
During your video of an Arduino based FM radio, you used one. But didn't understand how it actually works and I am ready to change my power supply on by Automatic Light System.
reply
Did he just prevent some university students from spending time building a custom microcontroller compatible buck-boost converter and showed a simple hack to convert any buck/boost converter that can be controlled by an Arduino!
YES, HE DID!
Great video as always!
During your video of an Arduino based FM radio, you used one. But didn't understand how it actually works and I am ready to change my power supply on by Automatic Light System.
reply
Whereswally606
Wanted to use one of these on a 120v boost converter. Would this work similarly or is the v at the mechanical pot higher than 36v? This is for a home power wall based on 40v batteries which charge on a cheap 5p per kwh tariff over night and offset my house base load through the day. Would be nice to be able to boost the v remotely via a esp32 into the solar inverter and thus respond more dynamically to changing loads.
reply
Wanted to use one of these on a 120v boost converter. Would this work similarly or is the v at the mechanical pot higher than 36v? This is for a home power wall based on 40v batteries which charge on a cheap 5p per kwh tariff over night and offset my house base load through the day. Would be nice to be able to boost the v remotely via a esp32 into the solar inverter and thus respond more dynamically to changing loads.
reply
Rocky
I remember once we needed a Digital Potentiometer that handle relatively high voltage but can't find one. so we used LDR with a LED facing each other then used a PWM signal alone with RC filter to power the LED and make crude variable resister. it was non linear but had feed back even before the modification so that it never gave any problems.
reply
I remember once we needed a Digital Potentiometer that handle relatively high voltage but can't find one. so we used LDR with a LED facing each other then used a PWM signal alone with RC filter to power the LED and make crude variable resister. it was non linear but had feed back even before the modification so that it never gave any problems.
reply
Jay
Thank you for all of your amazing videos! I always learn so much.
I am trying to learn to build a circuit that puts out 750 mv-dc.
Can you do a video explaining how I can achieve this? If not, can you at least point me in the direction of where I can learn how to do this? Thank you!
reply
Thank you for all of your amazing videos! I always learn so much.
I am trying to learn to build a circuit that puts out 750 mv-dc.
Can you do a video explaining how I can achieve this? If not, can you at least point me in the direction of where I can learn how to do this? Thank you!
reply
James
Another perfectly timed video. Been working on driving a panel using ESP, but I couldn't find a good digipot that wouldn't go open-circuit between switching resistances! I blew up a boost board already by using a potentiometer that had a gap or internal problem!
Thanks great Scott!
reply
Another perfectly timed video. Been working on driving a panel using ESP, but I couldn't find a good digipot that wouldn't go open-circuit between switching resistances! I blew up a boost board already by using a potentiometer that had a gap or internal problem!
Thanks great Scott!
reply
Skip
I'm wondering why they would put 100 resistors in a chip, when I would assume one could easily work with power-of-two increasing resistors, and enabling them in parallel to efficiently create the desired resistance. With only 10 resistors you could have 1024 steps.
reply
I'm wondering why they would put 100 resistors in a chip, when I would assume one could easily work with power-of-two increasing resistors, and enabling them in parallel to efficiently create the desired resistance. With only 10 resistors you could have 1024 steps.
reply
Everything
This could actually be the solution for a project I've been thinking up where i needed to change a resistor value without changing the input voltage. (Pwm not really an option, pot feeds a 555tumer running at up to 120kHz)
reply
This could actually be the solution for a project I've been thinking up where i needed to change a resistor value without changing the input voltage. (Pwm not really an option, pot feeds a 555tumer running at up to 120kHz)
reply
Shubhayu
Why not use the ADC of the MCU, and use a DAC to provide the output voltage? The output can be buffered/amplified with an opamp to provide any voltage required
reply
Why not use the ADC of the MCU, and use a DAC to provide the output voltage? The output can be buffered/amplified with an opamp to provide any voltage required
reply
555circuitslab
The High Voltage version MCP41HV51 is available at different large electronics suppliers (i. e. Digikey, Farnell, Reichelt) for a much cheaper price.
reply
The High Voltage version MCP41HV51 is available at different large electronics suppliers (i. e. Digikey, Farnell, Reichelt) for a much cheaper price.
reply
Add a review, comment
Other channel videos
11:12
