Search found 130 matches

by Nicolas Krause
Tue Feb 16, 2021 9:23 pm
Forum: Interesting Links
Topic: Molecular Beam Epitaxy
Replies: 0
Views: 311

Molecular Beam Epitaxy

I found this video on youtube, the gentleman has a really nice set of videos, but of particular interest I think for the Fusor community are his three videos on MBE. In particular he shows an evaporation chamber for lead selenium and how it's reloaded. It's basically a simple inert crucible with som...
by Nicolas Krause
Mon Feb 15, 2021 8:31 pm
Forum: Advanced Technical Discussion Area
Topic: Python Simulation
Replies: 20
Views: 4845

Re: Python Simulation

Very nice simulation Nathan. This poster is about the only academic reference I've been able to find that analyzes the possible orbits in a Fusor. It has a very nice perspective from non-linear dynamics about why things like star mode exist in the Fusor.
by Nicolas Krause
Sat Feb 13, 2021 6:02 pm
Forum: Vacuum Technology (& FAQs)
Topic: DIY Turbopump Controller
Replies: 31
Views: 3070

Re: DIY Turbopump Controller

Thanks for the clarification John, I've added the suggested circuit protection, now I just have to spec everything and layout the board! That's a nice way of thinking about energy as cartridge size, it's been awhile since I've been on a range but even though .22 LR is small I wouldn't want to be hit...
by Nicolas Krause
Fri Feb 12, 2021 5:43 pm
Forum: Vacuum Technology (& FAQs)
Topic: DIY Turbopump Controller
Replies: 31
Views: 3070

Re: DIY Turbopump Controller

Hi John I have a TMP 50 so I'm dealing with one of the smaller pumps. But my general understanding of the circuit is that you use some discrete logic to generate the signals which drive the half bridge connected to the 3-phase motor of the pump. I had assumed that hooking up the microcontroller to t...
by Nicolas Krause
Tue Feb 09, 2021 6:56 pm
Forum: Vacuum Technology (& FAQs)
Topic: DIY Turbopump Controller
Replies: 31
Views: 3070

Re: DIY Turbopump Controller

Thanks for the clarification John, I think I've misunderstood something fundamental about the operation of the circuit. I'm going to have to digest your post and look over things.
by Nicolas Krause
Tue Feb 09, 2021 5:32 pm
Forum: Vacuum Technology (& FAQs)
Topic: DIY Turbopump Controller
Replies: 31
Views: 3070

Re: DIY Turbopump Controller

Oh geez, I'm super sorry, missed that!
by Nicolas Krause
Mon Feb 08, 2021 10:29 pm
Forum: Vacuum Technology (& FAQs)
Topic: DIY Turbopump Controller
Replies: 31
Views: 3070

Re: DIY Turbopump Controller

Hi Akradiusz, thanks for the links and files. If I could ask you to introduce yourself on the welcome forum it'd be a big help. The rules the old timers have setup here really help to preserve the quality of information on the forum!
by Nicolas Krause
Fri Feb 05, 2021 2:57 am
Forum: Vacuum Technology (& FAQs)
Topic: DIY Turbopump Controller
Replies: 31
Views: 3070

Re: DIY Turbopump Controller

I've hooked in the microcontroller, LCD, and on/off switch on the current schematic. Still lots of details left to verify though. I can't seem to attach the file to the message board but if you PM me I'll happily provide the file to any interested parties. I do have a question about the connectors t...
by Nicolas Krause
Tue Feb 02, 2021 8:55 pm
Forum: Vacuum Technology (& FAQs)
Topic: LCD Vacuum Sensor
Replies: 19
Views: 4130

Re: LCD Vacuum Sensor

Just reviewing the board as I run through setting everything up, and I've noticed that I've forgotten a potentiometer on the power supply to the thermocouple gauge. I'll have to complete another revision of the board at some point, but for the immediate I'll probably just cut the power trace on the ...
by Nicolas Krause
Sat Jan 30, 2021 6:27 pm
Forum: Vacuum Technology (& FAQs)
Topic: LCD Vacuum Sensor
Replies: 19
Views: 4130

Re: LCD Vacuum Sensor

Good eye! Yes it is an art of electronics book (actually 2, 3rd and 2nd edition as the 2nd edition has some neat physics circuits at the back). The plan right now is not to plug the device into my computer but rather to use a USB power supply to run it. The whole board is built around a TI Tiva C La...