NPN protective zener

tracer.

beyond a power supply which the name refers to?

;)

On a sunny day (Sun, 23 Jun 2019 12:09:36 -0700 (PDT)) it happened Lasse Langwadt Christensen wrote in :

Somehow that brings up a picture of a DC coupled audio power amp with some current limiting.

On Sunday, June 23, 2019 at 3:09:39 PM UTC-4, Lasse Langwadt Christensen wr ote:

ll

ve tracer.

es beyond a power supply which the name refers to?

Thanks. It literally didn't occur to me Wikipedia would have a page on thi s.

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  Rick C. 

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But fully programmable and interfaced, nanovolts to hundreds of volts, fA to amps, CV/CC, floating, and seriously accurate. Many of our test racks include a Keysight SMU.

I've considered going into the SMU business, but it would be seriously difficult.

It ought to measure capacitance too.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics

Is this what all these snippets you've posted about pulse generators are related to?

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Huh, you should do the photo-electric effect with them...

George H.

[about long settling times for low-current measurement]

My experience is mainly with ionizing X-rays, in a gas (capacitor), also known as an ion chamber. For near-visible UV in an environment of mixed materials (insulating polymers, coatings, printed wiring boards with mask and epoxy/fiberglass insulation), I'd expect surface charges to dissipate but cannot be sure how penetrating the radiation is, nor what materials are the most sensitive.

280nm LEDs? is there any ozone generated? That's almost vacuum UV! Is it a harmonic generation from a laser?

On a sunny day (Sun, 23 Jun 2019 13:50:31 -0700) it happened John Larkin wrote in :

So HiFi audio amp for golden ears, that explains the price ;-)

Market big enough?

There seems to be a tendency to make things (all things) that can do everything. I bought a new Canon camera last week, and having had 3 and a lot of experience, I almost got to the point of wanting to return it. Anyways, reading the manual did help a bit.... It can do a lot of things, but the things I want it do??? Anyways macro mode works OK, one thing I use it for. Zoom is very powerful too, if you can hold it still.... Beginning to like it.

On a sunny day (Sun, 23 Jun 2019 22:56:28 -0700 (PDT)) it happened whit3rd wrote in :

I still have an 220V UV EPROM erase tube, that should do.

it would need to be mounted in a separate box shining in through some metal grid I suppose. Fun shining that at some stuff.. fluorescence...

Have an UV flashlight to check banknotes too... No idea about the wavelength,

I'll try it out during the summer vacation!

There's basically no ozone generation with these ones - wavelenght is at the limit of O3 generation and the power is in the 0.5mW region. These are real LEDs from SETi, no doubling/tripling. Looks like they're no longer marketing these (UVTOP-series), they're leftovers from a project about 10 years ago.

--
mikko

What did SETi do with UV lEDs? Hmm, SETi, lower-case intelligence?

--
 Thanks, 
    - Win

No, that's a different business. We do both fast pulse stuff and precision analog stuff, which are distinctly different technologies and customers. We used to do NMR gradient drivers, which sort of overlap.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics

Looking for dumb aliens.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics

The beta loss is indicative of progressive junction damage, which is what would make me nervous about this idea. Sounds like a long-term reliability headache.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC / Hobbs ElectroOptics 
Optics, Electro-optics, Photonics, Analog Electronics 
Briarcliff Manor NY 10510 

http://electrooptical.net 
http://hobbs-eo.com

I bet we could play music through the SMU, USB or Ethernet interface.

I'd love to get semiconductor CV curves easily. The SMU would need two channels that can also measure capacitance.

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com

Or you could make a laser-produced plasma by focusing down a pulsed YAG laser. ;)

Cheers

Phil Hobbs

(Who actually has a patent on suppressing static charge inside semiconductor litho tools by doing that. One of my old boss's enthusiasms.)

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC / Hobbs ElectroOptics 
Optics, Electro-optics, Photonics, Analog Electronics 
Briarcliff Manor NY 10510 

http://electrooptical.net 
http://hobbs-eo.com

Wire a couple of Boonton 72s in series with the SMUs!

Cheers

Phil Hobbs

Yes, they have bias inputs on the back. Where's the Ethernet connector?

Didn't one of the Boontons have BCD out?

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com

I ran a small NPN as a b-e zener for a week or so. The voltage declined a bit, roughly 1% as I recall, and seemed to be leveling out.

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com