Search found 138 matches

by Nicolas Krause
Sun Jan 24, 2021 1:16 am
Forum: Vacuum Technology (& FAQs)
Topic: DIY Turbopump Controller
Replies: 31
Views: 4412

Re: DIY Turbopump Controller

Peter, thank you for photos and explanation of how the device measures the turbopump speed. I think at this point I'll press on with the custom design rather than the VFD option given the work John has already put into the circuit design. Nikodem, I'm happy to share the schematic, I should warn you ...
by Nicolas Krause
Fri Jan 22, 2021 7:03 pm
Forum: Vacuum Technology (& FAQs)
Topic: DIY Turbopump Controller
Replies: 31
Views: 4412

Re: DIY Turbopump Controller

Hi John, I've got a first draft of your schematic done up in KiCad, still have to build a bunch of footprints and possibly swap out a component or two, but lot of the basic work is done. I've also ordered a couple of the new Raspberry Pi Pico microcontrollers. They're very cheap, 4$, and seem to mee...
by Nicolas Krause
Sun Jan 17, 2021 3:11 am
Forum: Vacuum Technology (& FAQs)
Topic: DIY Turbopump Controller
Replies: 31
Views: 4412

Re: DIY Turbopump Controller

I'd read that it was proprietary work on the original thread, no worries there, looks like a fun project for me to add a microcontroller. Besides, I've got a lot more faith in your circuit design skills than mine when it comes to the driver portion! I'm in the process of replicating your circuit at ...
by Nicolas Krause
Sat Jan 16, 2021 7:49 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Low Cost Spectrometer and Plasma Spectroscopy
Replies: 2
Views: 503

Low Cost Spectrometer and Plasma Spectroscopy

I know there's been lots of impressive sensing work done on the forum before, some members have built their own quadropole mass spectrometers, but I don't recall reading anything about light based plasma spectroscopy. I found this low cost ($750) spectrometer online and started reading the following...
by Nicolas Krause
Thu Jan 14, 2021 7:23 pm
Forum: Vacuum Technology (& FAQs)
Topic: DIY Turbopump Controller
Replies: 31
Views: 4412

Re: DIY Turbopump Controller

Thanks for the reply John, I've found your design on the coulter smithing forums. Just to confirm a couple of things I'm reading about the device. There's no magnet sensor on the TPM 50 Your design uses no microcontroller, but there is some digital logic, it looks like there's an output I assume to ...
by Nicolas Krause
Thu Jan 14, 2021 6:39 pm
Forum: Vacuum Technology (& FAQs)
Topic: DIY Turbopump Controller
Replies: 31
Views: 4412

DIY Turbopump Controller

While I've purchased a TPM 50 turbopump for 100$ off of eBay, the device did not come with a controller. I'm unable to afford the purchase price of a new turbotronik controller, and while I've been looking on eBay, I haven't seen one come up for a price I can afford. I have a portion of the circuit ...
by Nicolas Krause
Thu Jan 07, 2021 7:31 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High Voltage Probe
Replies: 3
Views: 781

Re: High Voltage Probe

It's all in series with a zig zag. I'm using VR37 resistors with the exception of the tuning potentiometer and a single 30kohm resistor at the very end of the chain
by Nicolas Krause
Wed Jan 06, 2021 10:29 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High Voltage Probe
Replies: 3
Views: 781

Re: High Voltage Probe

Components arrived this morning, and after a whole whack of soldering I've placed nearly all the resistors, might make some cosmetic adjustments to position in a bit, but the bulk of the soldering work is done!
IMG_1470[1].JPG
by Nicolas Krause
Wed Jan 06, 2021 4:44 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High Voltage Probe
Replies: 3
Views: 781

High Voltage Probe

I'm hoping to get one or two more projects done before classes start up again. Over fall reading break I threw together a pcb in KiCad for a high voltage probe. It's nothing too complicated, just the usual string of resistors but I put in the order to digikey for the parts today. Due to the awkward ...
by Nicolas Krause
Mon Jan 04, 2021 1:01 am
Forum: Advanced Technical Discussion Area
Topic: 3D Electric Potential
Replies: 3
Views: 546

Re: 3D Electric Potential

I've got a 3d scatter plot working now! I'm unsure if I'll be able to generate a mesh as I'm running into a bunch of trouble, and the scatter plot looks quite nice as it is.
Capture.PNG