Shimadzu (with Kratos next door) have a research lab near us, we do their PCBs, some interesting and very clever people there.... But I would not like to work there full time, we draw lots to see who will loose and go there when required, very strange environment, everything is done carefully and slowly with lots of confirmation and measurements. One of my major mistakes was made there, blowing up an electron microscope development PSU I was doing, some diodes wrong way round...
5x 10kV 20x 1kV and a 30kV PSU shorted together for a very short but impressive time!
She's posted here a couple times, but she's less interested in the hardware side of audio than she is the psychological and neurological aspects. So when the last issue of Linear Audio arrived, she skipped over Scott's paper but devoured the really clever and superb article by Mike Uwins about the impact of the non-auditory aspects of LP on auditory perception.
The real Mr. and Mrs. Smith is probably Earl Geddes and Lidia Lee.
We're probably a poorer and worse-dressed version of Nick and Nora.
Undercover Blues (Dennis Quaid, Kathleen Turner and Stanley Tucci )
Which makes Mr Rasmussen...My name José, José Muerte.
https://www.youtube.com/watch?v=PwBv2ZSJc5w
(originals are always so much nicer, imo. Prizzi's Honor 1985, Jack Nicholson, and again Kathleen Turner. Mr. and Mrs. Pizzanna)
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A couple of months work gone in microseconds, not high current but plenty of power in a short time
I was not popular for a while....OK thank you, had good news after second op (last week), muscle clear of tumour cells so having 3 months of this:
BCG treatment for early (non-invasive) bladder cancer - Cancer Information - Macmillan Cancer Support
Could be a lot worse so I am buzzing.
Marce, so far so good, time for some celebratory music https://www.youtube.com/watch?v=CqU6U2Yhnps
Which subtype did you use? It seems to be a large family including members with
built-in current limiter.
I don't think it is the slope resistance. The avalanche knees are much steeper,
but have more noise.
BTW I have repeated the z-diode measurements, one of them was wrong.
The 1N4151 is in forward direction.
Watch this low noise LM329 :-(
regards, Gerhard
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Gerhard,
Thanks for these measurements! Just out of curiosity--who makes your 1n4151? A little higher 1/f noise than the others, but that's perhaps because the HF noise level is lower than the others. And those HF spurs are confusing.
Do you know what is the cause of the ~150 Hz spike in several of the (lower bound) measurements? The 50 Hz one is understandable.
Marce,
Great to hear!
John,
Cheers to your friends.
Thanks for these measurements! Just out of curiosity--who makes your 1n4151? A little higher 1/f noise than the others, but that's perhaps because the HF noise level is lower than the others. And those HF spurs are confusing.
Do you know what is the cause of the ~150 Hz spike in several of the (lower bound) measurements? The 50 Hz one is understandable.
Marce,
Great to hear!
John,
Cheers to your friends.
I can believe it.
Sorry I missed Saturday. I've done a couple of streamer setups, both for myself and for my daughter. The latest was put together Friday - computer and DAC, 4" x 3" x 2" (for you metric guys, that's something like seven and a half cubits ... I think) and running Linux.
Don't know the manufacturer. New Very Old Stock. They were in a bag
labeled 6V2 zeners, but after downloading the Vishay data sheet I understood
why it did not work that way. So I turned it around.
150 Hz is simply the harmonic of the grid frequency. It took a lot of shielding
to get the interference that far down. The switcher of the energy saving lamp on
the table is also sometimes visible, depending on position and on/off state.
0 dB is about the input referred noise density of an LT1028 or AD797.
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