Search found 22 matches

by Gustavo Cervantes
Mon May 10, 2021 3:44 am
Forum: Vacuum Technology (& FAQs)
Topic: TMH-260 Turbo
Replies: 31
Views: 14593

Re: TMH-260 Turbo

Ok it seems that I misunderstood your last question, at the moment I'm driving the hall sensors with 5v directly, the the output gets compared by the lm2903 to a fixed voltage set via a 10 turn preset that's how I'm getting a 0 or 1 from them, that's what I feed to the decoder down the line. I knew ...
by Gustavo Cervantes
Sun May 09, 2021 4:05 am
Forum: Vacuum Technology (& FAQs)
Topic: TMH-260 Turbo
Replies: 31
Views: 14593

Re: TMH-260 Turbo

Since it was like 2 years ago, im not too sure on the details, i just remember probing with a voltmeter to find the windings, once i isolated those i just took the remaining cables and started aplying 5v and ground to a bundle of 3 with a current limited source until i got a signal out. And its not ...
by Gustavo Cervantes
Sun May 09, 2021 3:52 am
Forum: Vacuum Technology (& FAQs)
Topic: TMH-260 Turbo
Replies: 31
Views: 14593

Re: TMH-260 Turbo

Well thats seems familiar, thats the topology of a switch mode power supply, to be honest the zener diode idea i took from another guy, seems to work for him, not sure why my implementation is giving me problems.
I will do some measurements and report back.
Thank you Al for your input on this
by Gustavo Cervantes
Sun May 09, 2021 2:40 am
Forum: Vacuum Technology (& FAQs)
Topic: TMH-260 Turbo
Replies: 31
Views: 14593

Re: TMH-260 Turbo

Not sure why i wrote IRF530, Im actually using IRF630's , When i started working on this controller i actually was using Flyback diodes instead of Zeners to disipate the energy, however i noticed that the common wire was heating up, which stopped after switching to the zeners, the ones im using are ...
by Gustavo Cervantes
Sat May 08, 2021 10:04 pm
Forum: Vacuum Technology (& FAQs)
Topic: TMH-260 Turbo
Replies: 31
Views: 14593

Re: TMH-260 Turbo

Ok here's the shcematic i was using about 30khz pwm frequency, i may add a current sensing chip later just to be safe
Im not sure why eagle exports the image with lines that thin, its kind of hard to see them
by Gustavo Cervantes
Sat May 08, 2021 9:19 pm
Forum: Vacuum Technology (& FAQs)
Topic: TMH-260 Turbo
Replies: 31
Views: 14593

Re: TMH-260 Turbo

I'll post the schematic tonight, but i have my suspicions, it could be underdriving the gate.
Been very busy with another pump driver for a small leybold one which is almost finished.
by Gustavo Cervantes
Wed May 05, 2021 3:58 am
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum Bearings for TMP-50
Replies: 7
Views: 1799

Re: Vacuum Bearings for TMP-50

Thanks for the advice Peter, the video was really informative.
Today i spent the afternoon with a machinist friend puting together a simple wrench to remove the rotor nuts, will post photos of the process soon maybe next week ill buy the bearings.
by Gustavo Cervantes
Wed May 05, 2021 3:55 am
Forum: Vacuum Technology (& FAQs)
Topic: Welding using oxy acetaline?
Replies: 7
Views: 1797

Re: Welding using oxy acetaline?

There was a manual on vacuum aparatus construction that mentioned brazing being OK for medium vacuum, i dont remmember how i got to that paper, it is a PDF online. That being said oxyacetilene welding might very well be another can of worms on its own. I have seen other guys build diffusion pumps vi...
by Gustavo Cervantes
Mon May 03, 2021 7:38 pm
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum Bearings for TMP-50
Replies: 7
Views: 1799

Re: Vacuum Bearings for TMP-50

I saw that video, the guy's amazing, i got my pump, for around 15 USD, but being honest I don't want to damage the pump. These are kinda hard to get, more so down here in Mexico, the guy who sold it to me thought it was a fan, so I got lucky on that. I will try the quality SKF bearings, and maybe th...
by Gustavo Cervantes
Mon May 03, 2021 5:10 am
Forum: Items For Sale
Topic: Mass flow controllers
Replies: 2
Views: 4386

Re: Mass flow controllers

Are these still available? i might use my vacuum system to do some sputtering and these would be perfect

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