dorkbotpdx-blabber Google Group

Re: [dorkbotpdx-blabber] OpenSpectometer

jerry.bieh...@gmail.com (Jerry Biehler) — Sat, 18 May 2013 04:43:34 UT

I looked at the Public Labs one when it was on kickstarted. It is good for someone who wants to look at something like a lamp and tell what gas mixture is in it or something like that. No good for the kinds of stuff I would like to do.

The UPRTek one is not a whole lot better in terms of spectral bandwidth. At 12nm it is pretty awful. For the stuff I want to do it needs to be sub-nm. I know I am asking a lot but I think the openSpectrometer could do it.

Re: [dorkbotpdx-blabber] Fwd: openSpectrometer PCB help and pattern matching software

jerry.bieh...@gmail.com (Jerry Biehler) — Fri, 17 May 2013 23:50:06 UT

Yes, they will when used in something like a scintillator for gamma spectroscopy. But in a situation with a spectrometer there is so much more light it will be an analog signal.

-Jerry

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Re: [dorkbotpdx-blabber] OpenSpectometer

t...@tom11.com (Tom Frisch) — Fri, 17 May 2013 23:46:53 UT

I've been following another spectrometer project for a while- the public
labs one- but haven't jumped in because they are using a webcam and I don't
see how it could produce good enough results to bother with.

My needs for a spectrometer are to measure color temp, CRI and CQS of a
light source. I have a spreadsheet w/ macros from the NIS that can

Re: [dorkbotpdx-blabber] Fwd: openSpectrometer PCB help and pattern matching software

nmz...@gmail.com (Nathan McCorkle) — Fri, 17 May 2013 23:23:39 UT

Hmm, some PMTs I've read about send out ticks, one per photon count.

--
-Nathan
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Re: [dorkbotpdx-blabber] [WANTED] Managed Ethernet switch

russ...@personaltelco.net (Russell Senior) — Fri, 17 May 2013 18:26:45 UT

Adam> I hadn't thought of something like that. What do you want for
Adam> it?

The most recent sale on ebay was $11. That was back in february.
Given depreciation, how about $10? Comes with a case and a CF card.
If you want an atheros miniPCI wifi radio, or some pcmcia 200 mW
802.11b radios, I can toss those in as well. You'd need to supply

Re: [dorkbotpdx-blabber] Fwd: openSpectrometer PCB help and pattern matching software

jerry.bieh...@gmail.com (Jerry Biehler) — Fri, 17 May 2013 15:28:38 UT

A PMT is a purely analog device. You supply power and you get a signal out proportional to the amount of light coming in to the unit. There is an external programming wires that takes an analog voltage to set the voltage level of the tube. This affects the sensitivity of the tube.

This is why I was thinking of building it around one of the new teensy 3.0 boards. With the 13bit analog in it would give more than enough resolution. Pretty simple concept, I quick scan to find the peak signal and adjust the gain of the pmt to get something like 90-95% full scale and then go back and collect data points for each step of the motor. Calibration would be made with a standard He-Ar glow lamp.

Re: [dorkbotpdx-blabber] [WANTED] Managed Ethernet switch

voxa...@gmail.com (Adam Hunt) — Fri, 17 May 2013 10:07:05 UT

I hadn't thought of something like that. What do you want for it?

On Thu, May 16, 2013 at 1:51 PM, Russell Senior

Re: [dorkbotpdx-blabber] Fwd: openSpectrometer PCB help and pattern matching software

nmz...@gmail.com (Nathan McCorkle) — Fri, 17 May 2013 08:37:35 UT

very cool, I'd love to help setup a PMT. I haven't seen the high-res
teensy analog in, but I'm working on this analog design for the CCD so
maybe it would be useful for a PMT, I could imagine the PMT outputting
a digital frequency I guess.

--
-Nathan
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Re: [dorkbotpdx-blabber] [WANTED] Managed Ethernet switch

russ...@personaltelco.net (Russell Senior) — Thu, 16 May 2013 20:51:00 UT

Adam> I'm trying to replace my aging WRT54GS that's beginning to
Adam> die with a "real" pfSense firewall. I have a little Dell desktop
Adam> that'll run everything just fine but it only has a single
Adam> Ethernet interface and no PCI slots. A firewall with a single
Adam> interface isn't much good to anyone. What was recommended to me

[dorkbotpdx-blabber] [WANTED] Managed Ethernet switch

voxa...@gmail.com (Adam Hunt) — Thu, 16 May 2013 09:53:45 UT

I'm trying to replace my aging WRT54GS that's beginning to die with a
"real" pfSense firewall. I have a little Dell desktop that'll run
everything just fine but it only has a single Ethernet interface and no PCI
slots. A firewall with a single interface isn't much good to anyone. What
was recommended to me is to use a managed switch with VLAN support so that

Re: [dorkbotpdx-blabber] Small run PCB assembly?

rye...@gmail.com (Ryan C.) — Thu, 16 May 2013 01:01:12 UT

Thanks for the leads, guys. I've contacted SMT NW and am in the process of
contacting Hi-Tek Electronics as well. I did get a preliminary quote from
Screaming Circuits, but that was for a 32 card run. I'll check them out
again with the higher quantity.

I've also given some thought to renting some SMT equipment and hiring some

[dorkbotpdx-blabber] Hardware by Hackers/Makers/Modders - the future?

jlar...@pacifier.com (Jim Larson) — Thu, 16 May 2013 00:54:46 UT

I found this article to be a rather interesting view of the future - or
at least an aspect of it.

[link]

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Re: [dorkbotpdx-blabber] Small run PCB assembly?

avr...@gmail.com (ioan ghip) — Wed, 15 May 2013 22:55:44 UT

There is a company here in Salem that
does SMT:

[link] <[link]>

I don't know how much they charge.

Yeah, we used SMT NW in Tigard by the mall, Paul has
used them too. They did our 15 boards quite reasonably (under

Re: [dorkbotpdx-blabber] Small run PCB assembly?

ron...@bynoe.us (Ronald Bynoe) — Wed, 15 May 2013 22:48:53 UT

Another thought, if you bump your run up to 200 you should be able to
command a sub-$10 price, which may justify the larger run! It gets
dramatically cheaper, especially if you have your boards panelized with
fiducials, and all your components on reels!

Re: [dorkbotpdx-blabber] Small run PCB assembly?

om...@omegacs.net (Erik Walthinsen) — Wed, 15 May 2013 22:48:00 UT

I've also used SMT NW and will continue to do so ;-)

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