Search found 39 matches

by Chris Mullins
Wed Feb 26, 2020 10:48 pm
Forum: Items wanted
Topic: 1 uF 1kV Ceramic Capacitors
Replies: 6
Views: 520

Re: 1 uF 1kV Ceramic Capacitors

I've used 1uF 1KV ceramic caps professionally in a product (not that specific one, but an equivalent). Like others have said, that's at the extreme edge of what's available in ceramic. The going rate in ~250 piece quantity is around $15 to $25 each. When Digikey or Mouser are almost out, they someti...
by Chris Mullins
Sun Dec 08, 2019 4:25 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Amptek Digital Pulse Processor
Replies: 13
Views: 1729

Re: Amptek Digital Pulse Processor

I got one for $280, which was also automatically accepted.
by Chris Mullins
Thu Sep 05, 2019 1:20 am
Forum: Announcements and Site Administration Topics
Topic: Any chance of an off-topic or non-fusion forum?
Replies: 12
Views: 1992

Re: Any chance of an off-topic or non-fusion forum?

It would be interesting to have a subforum that could cover DIY/home-built particle beam systems, ultra high vacuum, plasma physics, ion propulsion (e.g. mentioned here by Michael Bretti), sputtering, etc., hidden if not logged in. The existing site seems so clean and on-point that it's easy to visu...
by Chris Mullins
Sat May 18, 2019 6:18 pm
Forum: Announcements and Site Administration Topics
Topic: Joe Gayo's Lab Tour
Replies: 14
Views: 9624

Re: Joe Gayo's Lab Tour

I'd be interested.
by Chris Mullins
Thu Feb 07, 2019 3:48 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 16542

Re: Spectrum Recorder PCI-E Card?

Harald,

To be clear, my suggestions (and background) are centered around the digital signal processing and sampling ideas, not the underlying radiation/detector physics, or real-world PMT counter applications - I don't have much experience in that. Others have given good advice there.
by Chris Mullins
Tue Feb 05, 2019 1:19 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 16542

Re: Spectrum Recorder PCI-E Card?

Harald, The sampled signal doesn't have to be periodic, just bandlimited. E.g. see here: https://www.maximintegrated.com/en/app-notes/index.mvp/id/3628 . The reconstruction is the same, using the sinc function like Rich already mentioned. Try searching on "reconstruction filter" to learn more about ...
by Chris Mullins
Sun Feb 03, 2019 5:13 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 16542

Re: Spectrum Recorder PCI-E Card?

Harald, Focusing on just a couple small issues in this response - I think there are still some large terminology gaps causing some misunderstanding. In the US, a "spectrum analyzer" is a specific tool used mostly for RF work in the frequency domain. None of the hits in your ebay search for "spectrum...
by Chris Mullins
Fri Feb 01, 2019 11:48 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 16542

Re: Spectrum Recorder PCI-E Card?

Harald, I'm not sure those deconvolution functions in R are what you are looking for. If the pulse shape is dominated more by the impulse response of the amplifier, then if you know the amplifier transfer function you can undo the time-domain effect of the amp by a deconvolution , which can be done ...
by Chris Mullins
Sun Jan 27, 2019 1:20 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 16542

Re: Spectrum Recorder PCI-E Card?

Harald, Most of the devices from your ebay search are audio A/D devices, sampling at 192 kHz. I don't think you understand how extreme 16 bits at 5 Gsamples/sec is with the current state of the art. I doubt ANYONE makes something with those specs, at ANY price, at least not as an off-the-shelf produ...