This component can control tons of circuits! Digital Potentiometer Guide! EB#51
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You can get the shown Digital Potentiometers here (affiliate links):
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Aliexpress:
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Websites which were shown in the video:
www.instructables.com/MCP41HV...
www.renesas.com/us/en/documen...
datasheet.lcsc.com/lcsc/18061...
datasheet.lcsc.com/lcsc/20043...
www.ti.com/lit/ds/symlink/ucc...
cdn-reichelt.de/documents/dat...
In this episode of electronics basics we will be having a look at digital potentiometers. You can use them to control any circuit digitally by replacing their mechanical potentiometers with them. But there can be pitfalls when trying to simply replacing the potentiometer. That is why I will tell you all about digital potentiometers which includes how to control them, what kind of current and voltage they can handle and how to properly use them. Let's get started!
Thanks to Altium for sponsoring this video.
Music:
2011 Lookalike by Bartlebeats
0:00 Where Digital Potentiometers can be used!
1:39 Intro
2:14 X9C103 Overview
4:22 Digital Potentiometer Functional Principle
5:43 X9C103 Practical Test
6:42 Voltage Converter Digital Pot Problem
8:39 High Voltage Digital Pot solves the problem
9:49 Final Test & Verdict
@DandelionCollab 2 роки тому
"Destroyed itself" makes it sound like the chip was turning up its own voltage. :-) Great(Scott!) coverage of the topic.
@greatscottlab 2 роки тому
They do this around me ;-)
@wguid 2 роки тому
GreatScott to the pot: Stop hitting yourself, why are you hitting yourself
@Kalvinjj 2 роки тому
@@MetalheadAndNerd UKposts only allows it's own links usually... That being said I remember searching some motors on Aliexpress and finding one with I think 100W of "VIOLENCE!"
@Kalvinjj 2 роки тому
@@MetalheadAndNerd Found them, damn I've seen those tiny "beasts" in PS1 counterfeit controller vibration but to think they would have self destruction and even household blender capabilities is impressive! I don't know if even more crazy stuff popped out when translating to Portuguese, but it's really funny to search for suction cups in BR-Aliexpress, they get translated from "sucker" to the cuss word meaning, a moron, instead of a suction cup. Also crimping dies that it understands as death
@CuriousScientist 2 роки тому
You don't have to remove the original potentiometer of these buck converters. You just need to "inject" some extra voltage to the shorted pins (pin 2 and 3) of the onboard potentiometer through a resistor and by this you can trick the buck controller chip and control it perfectly. I did this already quite some time ago using a MCP4725 12-bit DAC and an SZBK07 buck converter. This DAC has higher resolution than those digital potmeters, so you can control the voltage on a really fine scale.
@DavidMishchenko 2 роки тому
Yeah, just check the voltage range on each potentiometer pin, set potentiometer to highest resistance and solder onto the appropriate pin without removing the potentiometer.
@CuriousScientist 2 роки тому
@@DavidMishchenko Yes, that is what I did. I knew the maximum voltage because of the maximum output voltage of the SZBK07 buck converter. Then I also knew my maximum controlling voltage and based on this I picked a resistor which through I fed the potentiometer.
@Fleurlean4 2 роки тому
Do you guys have links to resources for this
@CuriousScientist 2 роки тому
@@Fleurlean4 Yeah, visit my channel and website.
@CuriousScientist 2 роки тому
@@Rothammel1 I am happy to help!
@AnubhabKundu 2 роки тому
Your introduction to the IC chips are getting better day by day. I really loved this introduction!
@greatscottlab 2 роки тому
Glad to hear it!
@AnubhabKundu 2 роки тому
@@greatscottlab also i learnt Li ion pack making from you so thanks a lot from India! How about shooting a vlog inside a lithium ion cell factory!
@ZeroMass 2 роки тому
"let's get started" has been ripped off by many other diy channels on yt... You're still the original 🍻
@greatscottlab 2 роки тому
Thanks ;-)
@jamess1787 2 роки тому
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!
@lennard7123 2 роки тому
This was the video I was looking for! Thanks for doing all the research. I always wanted to control the brightness of a led with an arduino but never was able to, because I didn't knew how to use a digital potentiometer. Now I can finish my project🎉
@DanielsGameVault 2 роки тому
I remember reading it's not that easy to use a digital pot for audio applications, at least not as a direct replacement for a mechanical pot. The reason is you get pops on the audio every time you adjust it up/down and it requires some complications to the circuit so it only adjusts at zero-crossing....would be great to see a project like this though :)
@harshitrawat9494 2 роки тому
Please never stop making your videos. They are the best.
@jdsan6009 2 роки тому
Nice video, as always. One interesting application I used a digital pot for was to control an analog filter before an ADC. In this way it is possible to change the low pass frequency depending on the sampling rate.
@geniusaur 2 роки тому
I have been thinking about doing this with a boost converter for a while, thanks for doing all the research for me!
@greatscottlab 2 роки тому
Happy to help!
@AFelectronics 2 роки тому
It's such a great way to control the led driver, especially if you want to directly control it using a controller or wirelessly
@RMquickbit 2 роки тому
This is excellent man! Definitely an awesome ic to consider using 👊🏻
@greatscottlab 2 роки тому
Thanks👍 Definitely✌
@pauljackson2126 2 роки тому
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.
@CuriousScientist 2 роки тому
I already did a much smarter control with a MCP4725 12-bit DAC a year ago... You don't even need to remove/replace the original potentiometer. I even built an automatic digital thermostat which can maintain a Peltier cooler's temperature within a really tight range.
@lennard7123 2 роки тому
@@CuriousScientist Sound very interesting! Could you share how you did it?
@CuriousScientist 2 роки тому
@@lennard7123 Just check my channel and look for the SZBK07 playlist. I shared everything: wiring schematics, Arduino source code...etc.
@lennard7123 2 роки тому
@@CuriousScientist Thank you very much! I will definitely check it out :)
@Petch85 2 роки тому
I could really have used this video 3-4 years ago for a project. I will keep it in mind for the next project, thanks.
@scottwilliams895 2 роки тому
One great thing about (re)watching older videos... hearing the classic theme music!!
@innomkr 2 роки тому
Thanks for the great video, Great Scott! I didn’t even know these things existed… I already came up with a few ideas!
@Sovvyy 2 роки тому
Great summary! In regards to code, I write a library with example for the i2c version (MCP45HVX1) a few years back, it should turn up (never thought it would be relvant...).
@Delali 2 роки тому
This is soo cool. I'm definitely trying this. Since the first time i learned about digital potentiometers i haven't given much thought to it till now. Cool video ideas loading.
@Wynkov 2 роки тому
I was just looking for this for some of my projects a few days ago, thanks!
@kurtiunlisted8589 2 роки тому
Just a circuit idea I had recently: I think its possible to do the same thing (µC Control of such a DC/DC convertors output voltage) without the "exotic" part just by altering the feedback path a bit. Use a simple DAC (PWM pin is fine), Filter & Buffer that voltage using an opamp (a "rail-to-rail" one might be necessary), select the components around the opamp such that the resulting µC controllable voltage ranges from 0V up to the regulation point voltage specific to the DC/DC converter (= the voltage at the wiper of the DC adjustment pot which is kept constant by the DC/DC's own control IC) to get the maximum resolution in the end. Now adjust the voltage pot of the unmodified DC/DC to the maximum output voltage you want to be able to get out of the system. Then just keep this voltage pot in the circuit - but replace the "GND" point of the feedback circuit's resistive divider with the µC controlled DAC Voltage described above. Now you should have linear (!) control of the DC/DC's output voltage by setting the DAC - note however that the control will be reversed, a high DAC voltage results in a low DC/DC output and vice versa. Disclaimer: I have not tried this yet, but I think this should work and if so it's quite an elegant hack I think.
@paulmanhart4481 Рік тому
Ok. Nice video. But I didn’t understand it. I’m building a variable speed controller for a 4.25 hp, 130 VDC treadmill motor. I’m using a SCR, bridge rectifier, DC choke to drive the motor. I have a potentiometer on my SCR. I turned it slowly until the motor started turning. Then I measured the resistance (301 k). So I broke that down by using a 275k and 30k pots. One for rough rpm adjustment and one for fine. Would it be better to use a digital pot on this? If so, what kind do I get and how to hook it up. Your help is appreciated. Thanks, Paul
@samk2630 Рік тому
Good timing as I just bought a few to use in a project!
@somedude2492 2 роки тому
A few years ago i took apart a radio that had an electronically controlled volume potentiometer (if i'm not mistaken, i think it was volume). This was a radio from the 90's. Their solution to this problem? The potentiometer had a dc motor stuck to its back, if the radio deemed the volume too low, it just turned its own knob with the motor to crank the volume. Beautifully simple and complex at the same time.
@dcurry7287 2 роки тому
This control scheme is still in place for some audio products because digipots can have audible clicking as they internally switch between resistors if they're in the signal path.
@MCsCreations 2 роки тому
Pretty impressive little IC, dude! 😃 It can be useful in so many cases! Fantastic! Thanks for the video!!! Stay safe and creative there! 🖖😊
@greatscottlab 2 роки тому
Thanks for watching!
@andymouse 2 роки тому
Coupled with the TTP223 touch control chip you have a very flash volume control indeed !.....cheers.
@szabikka100 2 роки тому
Scott mentions in the video that these digital potentiometers can be used to control the volume of audio circuits. However, it is not really recommended to use an ordinary digital pot for such a task, as these usually make a "zipper like" sound with audio signals when you move the wiper up or down. For this kind of application you should use a specialised audio digital potentiometer with built-in zero crossing detection, like Dallas Semiconductor's DS1801 or DS1802. With these you can save some headache for yourself.
@NiHaoMike64 2 роки тому
There's programmable gain amplifiers like the PGA4311 specifically made for that task. Also, some DACs and amplifiers have volume adjustment built in.
@brucewilliams6292 2 роки тому
Very handy device! Thank you for bringing us such cool devices.
@PriyankBolia 2 роки тому
Yours channel is very informative, always learn something new. The best thing is, its not overly complicated, any useful topics only, and not too much kidy like simple arduino code to control PWM, it goes down to the basic electronics concepts, without focusing too much on online code.
@jasonmckain3812 2 роки тому
Thanks from Texas Scott.
@Homeuser3231 2 роки тому
I was looking for this for so long! I am planning to use this replace the knobs on my power supply since they seem to drift a lot.
@frost381 2 роки тому
Love your videos! Keep em coming!
@shivavarunadicherla 2 роки тому
I also saw some variations of potentiometers which are mechanical and also digital, the position of the contact is controlled by magnets, and are super simple to work with and don't have any resolution problem. But you have to change the contacts once in a year.
@PhG1961 2 роки тому
Excellent work and a great project... (from Great Scott ! I know I mentioned that before, but I couldn't resist... ;-) )
@priyabratasadhukhan6435 2 роки тому
Perfect.. this is what I was looking for. I will use this digital potentiometer with regular buck converter boards to make my own low-cost Arduino-controlled smart MPPT solar charge controller. Thank you for the video.
@suji730 2 роки тому
Your voice is crystal clear and beautiful ❤❤❤
@musef7883 2 роки тому
This was just what I was looking for. Thanks!
@MoisesCaster 2 роки тому
Excellent video as always.
@BRUXXUS 2 роки тому
Great video! I always wondered what use cases were meant for these.
@prte100 2 роки тому
I needed this video 6 years ago^^
@jimviau327 2 роки тому
05:10 - Resolution could be increased by a factor of 100 by utilizing 3 potentiometers. The third would be connected between both wipers of P1 and P2. The total resolution could be calculated with a simple formula. Total Resolution = init.resolution power 2.
@guidovlaere 6 місяців тому
Thanks for this great tutorial! Very helpfull!
@xpehkto 2 роки тому
If somebody needs ever higher voltages, look up motor-driven potentiometers. They are also used in some audio equipment as a very fun way to control sound volume.
@Akuba 2 роки тому
Can you read my mind? I was looking for something like this not even two days ago. You really save me alot of trouble here :D
@AVNGwebdev 2 роки тому
Great video as always, thank you
@DanielRisacher Рік тому
I did not know about the HV variants of the MCP41xx chips, which is precisely what I need. Thanks.
@sarathai2876 2 роки тому
Love your videos Happy Thanksgiving
@jayduffy7615 2 роки тому
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!
@gamingwithtrolling8002 2 роки тому
i was looking for this thing only danke!
@Leroys_Stuff 2 роки тому
Just what I needed thank you
@ammoniahuffers 2 роки тому
Very nice video also GreatScott! I have to wake till this time (now it's 23h16m in my country) to just watch you!
@greatscottlab 2 роки тому
I hope it was worth it :-)
@555circuitslab5 2 роки тому
The High Voltage version MCP41HV51 is available at different large electronics suppliers (i.e. Digikey, Farnell, Reichelt) for a much cheaper price.
@3dmixer552 2 роки тому
That is only the ic tho
@TaniaKisha 2 роки тому
Exactly this is what I made weeks ago :D It can be a pretty decent digitally adjustable portable power supply with current module for tiny projects.
@alfblack2 2 роки тому
OMG. I didnt know digital potentiometer existed. That is awsome!
@melplishka5978 2 роки тому
Great vid Scott. Ty.
@MrAbrandao 2 роки тому
Using the voltage divider and mosfets can be a great solution for a 2 or 3 steps using discrete components.
@carlos2004 2 роки тому
i love these things. i built a personal project that controls my minidsp and my speaker amp, as well as turns on my pc. the minidsp supports i2c control, buti decided to simply use a digital pot and use the arduino to control it. i was going to do the same for the amp, but unfortunately, the pot actually had audio channels going through it, so i ended up using a servo to physically control it with the arduino. so far, it has worked well and only once did it lock up, but a reset solved the problem
@noobulon4334 2 роки тому
Motorized potentiometors are an elegant solution if you want to keep some of the properties of having a pot
2 роки тому
This is very interesting, I was thinking recently about making a simple circuit to cross fade an estereo audio signal from one source to another with a pot to set the time it does the fade and 2 buttons that fire the change from one to the other, my first Idea was eletromechanical, using a potenciomenter connected to a gear reduction motor a couple of end of the line switches and a relay to invert directions, but now I wonder how I could achieve the same using this components.
@jafinch78 2 роки тому
Awesome man as always! Reminds me of some projects where digital capacitors and/or digital inductors might be useful. Seems there was another analog/passive device too that's not coming to mind... or if is... the application. digital diode/SCR? Anyways... nice work!
@Basetonic 2 роки тому
really nice topic! Thank you for that.
@21degrees 2 роки тому
Very Good & Relevant video that we can put to proper use. Thank you!
@Homemade103 2 роки тому
Really a good video that I have ever seen great Scott you are the best youtuber I ever I watch your video almost 3 year . Really you are a good engineer . And I always appreciate to make this type of videos projects and other thing as. And and this pwm digital are best for degitily controling features
@legominimovieproductions 2 роки тому
I am currently using your constant current load design to build a constant current discharge battery tester with a digital potentiometer and a rotatary encoder instead of the original potentiometer so the arduino can keep the current as precise as possible (with the normal potentiometer I have the problem that for idk reasons the current slightly changes from time to time, leading to unclean results)
@magribi 2 роки тому
woooow.amazing video and nice explanation
@ANANTHASANKAR_UA 2 роки тому
Great work!! It's very useful for making digital volume control & digital graphic equalizer 🎶🎚️🎚️🎚️
@JamesPotts 2 роки тому
I used a dual digital pot to replace the joystick input on a wheelchair controller. Was a great way to get a digital interface, while keeping the wheelchair's insanely good control systems.
@t1d100 2 роки тому
Good information. Thank you!
@aliazadasl8129 2 роки тому
Very good and informative as always I'd like a video about plasma flame
@FabRecUp 2 роки тому
Nice video, i worked with such MCP ICs for a project recently, i had a problem thought, i could'nt find a 1 Mohm digital pot...
@williamkopanchuk Рік тому
Excellent video!
@raxathor 2 роки тому
Haash after a long time found this interesting..🔥
@ezzeldin101 2 роки тому
Awesome video as always!!!
@greatscottlab 2 роки тому
Thanks for the visit
@Drxxx 2 роки тому
this is amazing!
@mkase4697 2 роки тому
Interesting video as always. I had been wondering about these and I appreciate your 'review' of them, thank you. I have read some of the other comments and a few are a bit above my knowledge of electronics to get my head around easily. However, if one wanted to create a simple digital pot with fine adjustment with simple inputs, what about a small N20 gear motor directly coupled with a 3590s 10 turn pot? You wouldn't need anything other than a switch to drive it - no I2C etc. You could even drive it with an Arduino (though it could overload the pin - it is at about the max current), but a cheap H bridge would be safer. I'd personally make the coupler not absolutely tight so that if the pot gets to the end the coupler will slip rather than break something. Anyways, just my take on it. If you want to try it, let me know and I could model it up for 3D printing.
@zxttgg 2 роки тому
there are two solutions I thought before as alternative. I use a servo motor to drive a pot. the next one is drive a optocoupler with pwm and a filter capacitor. the output side of optocoupler can be act like a resistor, but down side is not linear.
@kylebrake1806 2 роки тому
I love your videos!
@Donder1337 2 роки тому
Dude! This helps me so much! I understand it much beter, cause of you! Thx alot :D
@borisbahleda8564 2 роки тому
I love your vids❤ Very good content 👍
@greatscottlab 2 роки тому
Thanks :-)
@mannyfreeze8821 2 роки тому
Amazing Video as Always! I will have to try them out!
@greatscottlab 2 роки тому
Please do!
@gunnaralv 2 роки тому
Big thumb up for you and your videos!!!
@jacquesb5248 2 роки тому
very informative thanks man
@person880 2 роки тому
I hadn't really thought about digital potentiometers, so this was a good topic for me! Now add a mechanical potentiometer to your microcontroller's ADC, then use that value to set the resistance value on the digital potentiometer, so you still have the feel of the rotary switch! 😛😛
@sreejithsuresh357 2 роки тому
I like the fact it was so useful to know this information
@greatscottlab 2 роки тому
Great :-)
@davides4138 2 роки тому
Thanks for the great video, this was exactly what I was looking for. I still have some questions according the wiring, because my digital potentiometer started to burn, maybe the chip was badly soldered. Wiring would be: Pin 14: external Power Supply (20V) (GND to Arduino) Pin 13: connected to the place of the analog Potentiometer from Boost Converter 1st Pin 12: connected to the place of the analog Potentiometer from Boost Converter (wiper) 2nd Pin 11: connected to the place of the analog Potentiometer from Boost Converter 3rd Pin 10: connected to GND of the Arduino Pin 09: connected to GND of the Arduino Pin 08. connected to GND of the Arduino Thanks for your help!
@fixnreview 2 роки тому
Great project
@fryode 2 роки тому
I knew I had to watch this the moment I saw a QSKJ boost converter board in the thumbnail. I adapted one to take the 18VDC nominal from my Ryobi battery packs and boost it to 20V to run my Thinkpad. Since I was able to order two for like a dollar more than one would have cost me, I have a spare and I've been thinking of all the different stuff I can do with it. Doing things digitally is a lot more interesting than analog, I have to admit.
@Bianchi77 2 роки тому
Nice video, keep it up, thank you :)
@rogerfurer2273 2 роки тому
Very nice. Thank you for showing actually using one of these little guys. I've looked at them, but never had the need to try one. (Plus I like SPI and made my own bit-banging code in assembler for PIC--much faster that way.) A question that occurs to me: if a higher voltage needs to be handled, why not put the DP between the base and emitter of an NPN transistor and vary between just off to turn-on needed? It would be less than 0.7V and take only a little bit of math to calculate. Or do the same thing using an open collector Opto Coupler instead of the transistor.
@krzysztofmatuszek 2 роки тому
this way - I would not bother to use a DP at all, ESP32 has two built-in DACs perfect for wiring straight to the transistor.
@stm32user 2 роки тому
Digital pot usually used in audio electronics. Like cell phone volume buttons is a good example
@alejandrotaudil3689 2 роки тому
Thanks man!!!
@israelgiron9089 2 роки тому
Very useful thank you!
@koushiks_energy 2 роки тому
Nice video man 😌 Even if comes late, it's worth the wait
@greatscottlab 2 роки тому
Appreciate it!
@JawadAhmadsahibzada 2 роки тому
Great Great 👍👍👍 Scott !!! absolutely interesting video
@greatscottlab 2 роки тому
Glad you enjoyed it
@BloodBlight 2 роки тому
Dude, I spent like four MONTHS trying to find some way of doing this a while back.... And there is just a nice little IC... I mean, of COURSE there is... Sigh... Thank you!!!
@ha23456thtjh 2 роки тому
Can I use this for controlling volume for audio amplifier Great video 👍 as always
@electronic7979 2 роки тому
Nice video
@Bhavesh_g20 2 роки тому
I was eagerly waiting for this Previous Sunday also I was waiting for notification But this sunday it has come Awesome video
@greatscottlab 2 роки тому
Thanks for watching :-)
@skipbalk8248 2 роки тому
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.
@RexxSchneider 2 роки тому
Because of the tolerance available on the resistors. If the the biggest resistor is 512 times as big as the smallest, then it would need much better than 0.1% accuracy to maintain linearity when it is switched in and out. It's much easier to make 100 identical resistors with a fairly close tolerance, which would ensure that each step increases by nearly the same amount.
@joefuentes2977 2 роки тому
They are it comes down to design and purpose look up AD5292
@fryode 2 роки тому
@@joefuentes2977 Only 20-time programmable? Damn.
@skipbalk8248 2 роки тому
@@fryode Reading the datasheet, I'm fairly sure those are writes to persistant memory, and are not required if you program the chip on power-up with a few commands. The spec sheets says you can do unlimited adjustments.
@Kalvinjj 2 роки тому
Like Rex said, there are those topologies available indeed, also R 2R approaches, but meanwhile practical for low resolution and precision, it starts to get insanely hard to make up the hill. I've made myself an ADC for a PIC16F628A which doesn't have an internal ADC. Made a 6 bit R 2R one, chose one of the ports and made that one control the resistors in successive approximation (Output most significant bit, compare, store, next most significant, repeat). Worked like a charm, had pretty decent resistors at hand, and hand measured them all to make the pairs and individuals match perfectly. Still not like I would trust it to any high precision application, and that's just 64 levels. On ICs they're usually laser trimmed on the die.
@wojwoj06 2 роки тому
Very cool! This immediately brings to mind a scene from Star Trek - "...computer decrease illumination by 50%"
@SahilKumar-ds7ev 2 роки тому
Hi bro you make awsome content
@inventorkr1 2 роки тому
Accept my regards, my dear friend, good work and excellent explanation❤️❤️❤️❤️❤️❤️❤️❤️
@station240 2 роки тому
If you put a comparator (opamp) between the feedback voltage and the PWM chip, then you can work with 5V or so. Then put the Digital Potentiometer with another 10k resistor to form voltage divider, and add that to the other opamp input. So the Boost Convertor's 0-25V becomes 0-5V, and you can adjust the other voltage divider it's being compared against. As the PWM FB pin expects something like 1.2V before it triggers, you need a 3rd voltage divider on the Opamp output.
GreatScott!
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