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Groups > sci.electronics.design > #403065
| From | Winfield Hill <hill@rowland.harvard.edu> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Exhausted |
| Date | 2016-03-16 07:32 -0700 |
| Organization | Rowland Institute |
| Message-ID | <ncbqqc0c2q@drn.newsguy.com> (permalink) |
| References | <op.yeelaqs9wei6gd@phenom-pc> <dd3fb7a4-ffca-4bec-81fe-758714f80cd8@googlegroups.com> |
George Herold wrote...
>
>On Wednesday, March 16, 2016 at 1:53:11 AM UTC-4, David Eather wrote:
>> If any kind soul can help...
>>
>> There was a short post/note on SED or SEB about a transistor with a 2.5V
>> max Vebo and another one with 3.0 max Vebo. I have spent hours looking for
>> the transistors and have run out of options. Does anyone remember which
>> transistor numbers these were?
>>
>> I'm adding transistor junction breakdown noise to a Arduino and they would
>> fit the bill perfectly - and cut out problem of providing extra voltage
>> sources other than %v power from USB.
>>
>> As always TIA.
>
> I don't know the transistors, but have you tried a low voltage zener.
> (The problem with both is that you may not get much more than just the
> shot noise.)
Agreed, the zener noise mechanism comes from avalanche, which
doesn't kick in until you get to voltages above about 8 volts.
Low-current "microplasmas" form and quickly terminate after
discharging the zener's self capacitance, creating a kind of
popcorn noise. There are extensive threads on the subject
15-20 years ago on s.e.d., where I spent a month (haha, more)
making and posting all kinds of nanosecond-scale measurements.
The zener physics effect (field emission) predominates at
low-voltages, see the ON Semi handbook, HBD854, page 20.
https://www.onsemi.com/pub/Collateral/HBD854-D.PDF
--
Thanks,
- Win
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Exhausted "David Eather" <eather@tpg.com.au> - 2016-03-16 15:53 +1000
Re: Exhausted Klaus Kragelund <klauskvik@hotmail.com> - 2016-03-16 01:07 -0700
Re: Exhausted George Herold <gherold@teachspin.com> - 2016-03-16 06:04 -0700
Re: Exhausted "David Eather" <eather@tpg.com.au> - 2016-03-17 00:16 +1000
Re: Exhausted Allan Herriman <allanherriman@hotmail.com> - 2016-03-16 16:35 +0000
Re: Exhausted George Herold <gherold@teachspin.com> - 2016-03-16 11:15 -0700
Re: Exhausted Allan Herriman <allanherriman@hotmail.com> - 2016-03-17 12:11 +0000
Re: Exhausted mrdarrett@gmail.com - 2016-03-17 10:37 -0700
Re: Exhausted "David Eather" <eather@tpg.com.au> - 2016-03-18 07:25 +1000
Re: Exhausted mrdarrett@gmail.com - 2016-03-17 15:05 -0700
Re: Exhausted Winfield Hill <hill@rowland.harvard.edu> - 2016-03-16 07:32 -0700
Re: Exhausted George Herold <gherold@teachspin.com> - 2016-03-16 08:04 -0700
Re: Exhausted Winfield Hill <hill@rowland.harvard.edu> - 2016-03-16 08:16 -0700
Re: Exhausted John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-16 10:32 -0700
Re: Exhausted George Herold <gherold@teachspin.com> - 2016-03-16 11:08 -0700
Re: Exhausted John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-16 12:30 -0700
Re: Exhausted Clifford Heath <no.spam@please.net> - 2016-03-17 06:47 +1100
Re: Exhausted John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-16 17:01 -0700
Re: Exhausted Clifford Heath <no.spam@please.net> - 2016-03-17 07:01 +1100
Re: Exhausted John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-16 17:27 -0700
Re: Exhausted Piotr Wyderski <peter.pan@neverland.mil> - 2016-03-17 17:35 +0100
Re: Exhausted John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-17 10:13 -0700
Re: Exhausted Clifford Heath <no.spam@please.net> - 2016-03-18 11:38 +1100
Re: Exhausted dplatt@coop.radagast.org (Dave Platt) - 2016-03-16 17:17 -0700
Re: Exhausted Lasse Langwadt Christensen <langwadt@fonz.dk> - 2016-03-16 17:21 -0700
Re: Exhausted John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-16 17:39 -0700
Re: Exhausted "Tim Williams" <tiwill@seventransistorlabs.com> - 2016-03-16 21:24 -0500
Re: Exhausted Phil Hobbs <pcdhobbs@gmail.com> - 2016-03-16 20:51 -0700
Re: Exhausted George Herold <gherold@teachspin.com> - 2016-03-16 20:21 -0700
Re: Exhausted John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-16 21:16 -0700
Re: Exhausted John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-16 17:34 -0700
Re: Exhausted "David Eather" <eather@tpg.com.au> - 2016-03-18 07:31 +1000
Re: Exhausted rickman <gnuarm@gmail.com> - 2016-03-17 00:01 -0400
Re: Exhausted Clifford Heath <no.spam@please.net> - 2016-03-17 14:09 +1100
Re: Exhausted John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-17 09:01 -0700
Re: Exhausted Piotr Wyderski <peter.pan@neverland.mil> - 2016-03-17 17:46 +0100
Re: Exhausted "David Eather" <eather@tpg.com.au> - 2016-03-18 07:33 +1000
Re: Exhausted "David Eather" <eather@tpg.com.au> - 2016-03-18 07:35 +1000
Re: Exhausted Piotr Wyderski <peter.pan@neverland.mil> - 2016-03-18 11:44 +0100
low-voltage low-current noise sources Winfield Hill <hill@rowland.harvard.edu> - 2016-03-16 08:10 -0700
Re: Exhausted John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-16 08:35 -0700
Re: Exhausted "David Eather" <eather@tpg.com.au> - 2016-03-18 07:52 +1000
Re: Exhausted John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-17 15:35 -0700
Re: Exhausted "David Eather" <eather@tpg.com.au> - 2016-03-18 09:09 +1000
Re: Exhausted John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-17 16:54 -0700
Re: Exhausted George Herold <gherold@teachspin.com> - 2016-03-17 17:40 -0700
Re: Exhausted mixed nuts <melopsitticus@undulatus.budgie> - 2016-03-17 22:37 -0400
Re: Exhausted "David Eather" <eather@tpg.com.au> - 2016-03-18 09:09 +1000
Re: Exhausted George Herold <gherold@teachspin.com> - 2016-03-17 17:29 -0700
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