Wow, that works unbelievably well considering you're not even over-driving the fan. Usually those things only draw a few watts but mixing water takes a lot more power than moving air. It might be a good idea to put some feet on the bottom to raise it off the bench enough for the fan to draw enough air through itself to keep cool. I tried this some time ago without much success. I laid a pair of quite strong magnets side by side with opposite poles facing up on a small metal strip glued to the hub of the fan. As I recall the issue was that although the field was very strong near the magnets, it dropped off too rapidly to fit a material of sufficient thickness between them and the work. I'll have to give this another go with poles facing diametrically outward like this so the field will be more spread out.
Did you buy the stir-bar or make it yourself? Is it just a metal bar inside or does it have a rod magnet in there? I think the other reason I didn't get mine working was because I was trying just to use a steel rod. It seems that the ellipsoid shape is quite important for minimizing friction between the bar and the container.
You should for sure try again. I already have had the stir bar that I used for chemistry projects. The problem you were having is the steel bar. The stir bar I am using has magnets inside of them. The magnets will follow magnets and the shape if the stir bar helps as well.
Nice job man, those are super common components. I actually believe I have all of those with exception to that type of compacitor. I even have the fan, I think it may be a slightly different size. Thanks for posting such a detailed easy to follow video.
Also, you specify a 1MΩ pot in the notes, yet you seem to be using a 5KΩ pot in your build (B5K). This is quite a discrepancy -- can you explain? It is not labeled on your wiring diagram.
Yes you are right. I miss typed. Thanks for spotting that out. And in the schematic I should have wrote that too. However, in my opinion there is no specific type of potntiometer needed. It is only larger the resistance the wider turning of the potentiometer and less resistance the shorter the turn.
@@SciTyeTech That makes sense. I'm new to this whole thing, so I just get confused when things don't line up 100%. Thanks so much for your tutorial, though! People like you make the internet a great place to learn. I'm waiting on an LM317 regulator to come in the mail so I can try out this design. I'll let you know how it goes! Cheers!
@@SciTyeTech it’s all good man! Just giving you a hard time. You’re way smarter on all of that stuff than I am. Why do you think I was watching the video! Lol.
And now I'm leaving a comment on your video. It will look just like this.
lol!
Wow, that works unbelievably well considering you're not even over-driving the fan. Usually those things only draw a few watts but mixing water takes a lot more power than moving air. It might be a good idea to put some feet on the bottom to raise it off the bench enough for the fan to draw enough air through itself to keep cool.
I tried this some time ago without much success. I laid a pair of quite strong magnets side by side with opposite poles facing up on a small metal strip glued to the hub of the fan. As I recall the issue was that although the field was very strong near the magnets, it dropped off too rapidly to fit a material of sufficient thickness between them and the work. I'll have to give this another go with poles facing diametrically outward like this so the field will be more spread out.
Did you buy the stir-bar or make it yourself? Is it just a metal bar inside or does it have a rod magnet in there? I think the other reason I didn't get mine working was because I was trying just to use a steel rod. It seems that the ellipsoid shape is quite important for minimizing friction between the bar and the container.
You should for sure try again. I already have had the stir bar that I used for chemistry projects. The problem you were having is the steel bar. The stir bar I am using has magnets inside of them. The magnets will follow magnets and the shape if the stir bar helps as well.
Can a 10k pot be used for this project?
Thanks!
Yes you can.
Nice job man, those are super common components. I actually believe I have all of those with exception to that type of compacitor. I even have the fan, I think it may be a slightly different size. Thanks for posting such a detailed easy to follow video.
Thanks! And you're welcome! I am glad you enjoyed this!
I just built a PWM controller for the same purpose. I wonder which gives more control. I'll build this later and test it out! Thanks for the idea!
Also, you specify a 1MΩ pot in the notes, yet you seem to be using a 5KΩ pot in your build (B5K). This is quite a discrepancy -- can you explain?
It is not labeled on your wiring diagram.
Yes you are right. I miss typed. Thanks for spotting that out. And in the schematic I should have wrote that too.
However, in my opinion there is no specific type of potntiometer needed. It is only larger the resistance the wider turning of the potentiometer and less resistance the shorter the turn.
@@SciTyeTech That makes sense. I'm new to this whole thing, so I just get confused when things don't line up 100%. Thanks so much for your tutorial, though! People like you make the internet a great place to learn. I'm waiting on an LM317 regulator to come in the mail so I can try out this design. I'll let you know how it goes! Cheers!
Good 🌹👌👍💯
Thanks!!
I'm having trouble finding a 1m ohm potentiometer and a 10µf 200v electrolytic capacitor. Can I ask where you purchased them?
I didn't, I found them from spare parts.
@@SciTyeTech Thanks, I eventually found some equivalent ones on Amazon.
Why all the trouble? This power supply and controller can be bought for two dollars, and with the magnet also rotating the CORRECT direction...
Can this use coding? Base on nodemcu??
Awesome
Thank you!!
ASMR soldering, but your iron looks absolutely awful do you use brass/sponge?
Yes I do. I have been using this soldering iron tip for 4 years. Just wanted to see how long it will last.
@@SciTyeTech it works wonderfully considering how crusty it looks
Just made this.....the only issue is that the Pot doesnt control the speed, it's just basically an ON/OFF switch.
How can I fix that?
There could be a component that is not functioning properly. Did you solder everything correctly?
Some fans can’t have their speed be regulated by the voltage, so maybe that’s the issue?
@@yourlocaltoad5102 from my knowledge every fan will spin slower on lower voltage
Try using smaller pot, if it's bigger than 100k then it may make the regulator malfunction
And it will look just like this
lol! I do say that a lot!
@@SciTyeTech it’s all good man! Just giving you a hard time. You’re way smarter on all of that stuff than I am. Why do you think I was watching the video! Lol.
Any1 know what issue cld be?