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Groups > sci.electronics.design > #450540 > unrolled thread
| Started by | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| First post | 2017-03-06 16:51 -0800 |
| Last post | 2017-03-11 21:04 -0500 |
| Articles | 20 on this page of 96 — 20 participants |
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RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-06 16:51 -0800
Re: RF bipolars RIP Winfield Hill <hill@rowland.harvard.edu> - 2017-03-06 18:01 -0800
Re: RF bipolars RIP Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2017-03-07 03:19 +0100
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-06 18:25 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-06 19:03 -0800
Re: RF bipolars RIP Winfield Hill <hill@rowland.harvard.edu> - 2017-03-06 19:11 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-06 20:40 -0800
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 07:28 -0800
Re: RF bipolars RIP Winfield Hill <hill@rowland.harvard.edu> - 2017-03-06 18:31 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-06 20:44 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 10:17 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-07 08:08 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 12:15 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-07 09:30 -0800
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 09:33 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 12:44 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-07 17:53 +0000
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 10:59 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 11:06 -0800
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 11:16 -0800
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-07 15:11 -0600
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 14:30 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-07 15:47 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-07 15:55 -0800
Re: RF bipolars RIP Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2017-03-08 11:50 +0100
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 16:36 -0800
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-08 04:40 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-08 06:24 -0800
Re: RF bipolars RIP dplatt@coop.radagast.org (Dave Platt) - 2017-03-07 16:55 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-08 06:40 -0800
Re: RF bipolars RIP Piotr Wyderski <no@mail.com> - 2017-03-09 07:10 +0100
Re: RF bipolars RIP dplatt@coop.radagast.org (Dave Platt) - 2017-03-10 21:32 -0800
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-07 22:57 -0600
Re: RF bipolars RIP, grab em while you can Winfield Hill <hill@rowland.harvard.edu> - 2017-03-09 04:05 -0800
Re: RF bipolars RIP, grab em while you can pcdhobbs@gmail.com - 2017-03-09 04:44 -0800
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-07 17:50 +0000
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 11:08 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 11:09 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 14:34 -0500
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 15:40 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-07 20:41 +0000
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 13:08 -0800
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-07 15:14 -0600
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 16:17 -0500
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-07 23:09 -0600
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-07 21:34 -0800
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-08 14:24 -0600
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-08 13:10 -0800
Re: RF bipolars RIP "Michael A. Terrell" <mike.terrell@earthlink.net> - 2017-03-09 14:19 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-09 22:10 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-10 11:50 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-10 17:27 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-10 12:52 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-10 19:01 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-10 15:19 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-10 21:42 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-10 17:52 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-10 23:38 +0000
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-10 17:38 -0800
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-11 10:23 +0000
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-11 03:30 -0800
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-11 12:50 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-11 10:49 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-11 15:55 +0000
Re: RF bipolars RIP "tom" <tmiller11147@verizon.net> - 2017-03-11 11:45 -0500
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-11 16:50 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 08:58 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-11 16:52 -0500
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-10 18:08 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 07:47 -0800
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-11 15:56 +0000
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 09:02 -0800
Re: RF bipolars RIP "Michael A. Terrell" <mike.terrell@earthlink.net> - 2017-03-10 13:28 -0500
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-08 04:35 -0800
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 14:05 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 14:33 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-07 15:40 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 16:44 -0800
Re: RF bipolars RIP Mikko OH2HVJ <mikko.syrjalahti@nospam.fi> - 2017-03-08 10:19 +0200
Re: RF bipolars RIP Winfield Hill <hill@rowland.harvard.edu> - 2017-03-08 04:30 -0800
Re: RF bipolars RIP Mikko OH2HVJ <mikko.syrjalahti@nospam.fi> - 2017-03-08 15:38 +0200
Re: RF bipolars RIP Robert Baer <robertbaer@localnet.com> - 2017-03-09 23:50 -0800
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-10 05:39 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-10 07:15 -0800
Re: RF bipolars RIP "Kevin Aylward" <kevinRemovAT@kevinaylward.co.uk> - 2017-03-07 21:55 +0000
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 14:10 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 14:43 -0800
Re: RF bipolars RIP Tim Wescott <tim@seemywebsite.really> - 2017-03-10 23:54 -0600
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-11 04:32 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 07:54 -0800
Re: RF bipolars RIP krw@notreal.com - 2017-03-11 11:15 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 09:17 -0800
Re: RF bipolars RIP "tom" <tmiller11147@verizon.net> - 2017-03-11 15:11 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 14:22 -0800
Re: RF bipolars RIP "tom" <tmiller11147@verizon.net> - 2017-03-11 21:11 -0500
Re: RF bipolars RIP krw@notreal.com - 2017-03-11 21:04 -0500
Page 2 of 5 — ← Prev page 1 [2] 3 4 5 Next page →
| From | "Tim Williams" <tiwill@seventransistorlabs.com> |
|---|---|
| Date | 2017-03-07 15:11 -0600 |
| Message-ID | <o9n7h6$cm9$1@dont-email.me> |
| In reply to | #450635 |
"Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message news:-ZmdnV-AmY1SdyPFnZ2dnUU7-XXNnZ2d@supernews.com... > Tubes have a similar problem, for similar reasons. ;) Some day, I'm going to try to build a proton triode. Just to see how truly awful its performance is. Should be, if one can arrange a comparable density of space charge, at low energy, into the space of what's otherwise a normal e.g. 12AX7 cathode, it'll be a paltry ~1umho transconductance. Would be fun to see the transit time on a nearly human scale (well, us instead of ns), though. Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: http://seventransistorlabs.com
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| From | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| Date | 2017-03-07 14:30 -0800 |
| Message-ID | <q0dubc1qv1uh3qknr9qcu353pk1t9uii4j@4ax.com> |
| In reply to | #450685 |
On Tue, 7 Mar 2017 15:11:41 -0600, "Tim Williams" <tiwill@seventransistorlabs.com> wrote: >"Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message >news:-ZmdnV-AmY1SdyPFnZ2dnUU7-XXNnZ2d@supernews.com... >> Tubes have a similar problem, for similar reasons. ;) > >Some day, I'm going to try to build a proton triode. Just to see how truly >awful its performance is. > >Should be, if one can arrange a comparable density of space charge, at low >energy, into the space of what's otherwise a normal e.g. 12AX7 cathode, >it'll be a paltry ~1umho transconductance. > >Would be fun to see the transit time on a nearly human scale (well, us >instead of ns), though. > >Tim You could add a grid to an alpha or beta battery. It would need a lot of grid control voltage. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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| From | George Herold <gherold@teachspin.com> |
|---|---|
| Date | 2017-03-07 15:47 -0800 |
| Message-ID | <e9e71fc8-f9ff-4195-a60d-7b71b62bfa61@googlegroups.com> |
| In reply to | #450685 |
On Tuesday, March 7, 2017 at 4:11:46 PM UTC-5, Tim Williams wrote: > "Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message > news:-ZmdnV-AmY1SdyPFnZ2dnUU7-XXNnZ2d@supernews.com... > > Tubes have a similar problem, for similar reasons. ;) > > Some day, I'm going to try to build a proton triode. Just to see how truly > awful its performance is. Where you getting the protons? Hydrogen plasma? (I'd love to find a cheap way to make protons... Diode laser-Lamb shift- somewhere near 650 nm. I've always wanted to make an ionic resistor (in water) and measure the Johnson noise... About equally useful. George h. > > Should be, if one can arrange a comparable density of space charge, at low > energy, into the space of what's otherwise a normal e.g. 12AX7 cathode, > it'll be a paltry ~1umho transconductance. > > Would be fun to see the transit time on a nearly human scale (well, us > instead of ns), though. > > Tim > > -- > Seven Transistor Labs, LLC > Electrical Engineering Consultation and Contract Design > Website: http://seventransistorlabs.com
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| From | George Herold <gherold@teachspin.com> |
|---|---|
| Date | 2017-03-07 15:55 -0800 |
| Message-ID | <9f447178-eb1e-4c2c-ae94-9fcdfbb7c99c@googlegroups.com> |
| In reply to | #450727 |
On Tuesday, March 7, 2017 at 6:48:02 PM UTC-5, George Herold wrote: > On Tuesday, March 7, 2017 at 4:11:46 PM UTC-5, Tim Williams wrote: > > "Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message > > news:-ZmdnV-AmY1SdyPFnZ2dnUU7-XXNnZ2d@supernews.com... > > > Tubes have a similar problem, for similar reasons. ;) > > > > Some day, I'm going to try to build a proton triode. Just to see how truly > > awful its performance is. > > Where you getting the protons? Hydrogen plasma? > (I'd love to find a cheap way to make protons... > Diode laser-Lamb shift- somewhere near 650 nm. > > I've always wanted to make an ionic resistor (in water) > and measure the Johnson noise... > > About equally useful. > > George h. > > > > Should be, if one can arrange a comparable density of space charge, at low > > energy, into the space of what's otherwise a normal e.g. 12AX7 cathode, > > it'll be a paltry ~1umho transconductance. > > > > Would be fun to see the transit time on a nearly human scale (well, us > > instead of ns), though. > > > > Tim > > > > -- > > Seven Transistor Labs, LLC > > Electrical Engineering Consultation and Contract Design > > Website: http://seventransistorlabs.com Oh sorry, I thought I was responding to Phil H. Do you know what the Lamb shift is? George H.
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| From | Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> |
|---|---|
| Date | 2017-03-08 11:50 +0100 |
| Message-ID | <58bfe259$0$10701$e4fe514c@textnews.kpn.nl> |
| In reply to | #450729 |
On 08.03.17 0:55, George Herold wrote: > On Tuesday, March 7, 2017 at 6:48:02 PM UTC-5, George Herold wrote: >> On Tuesday, March 7, 2017 at 4:11:46 PM UTC-5, Tim Williams wrote: >>> "Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message >>> news:-ZmdnV-AmY1SdyPFnZ2dnUU7-XXNnZ2d@supernews.com... >>>> Tubes have a similar problem, for similar reasons. ;) >>> >>> Some day, I'm going to try to build a proton triode. Just to see how truly >>> awful its performance is. >> >> Where you getting the protons? Hydrogen plasma? >> (I'd love to find a cheap way to make protons... >> Diode laser-Lamb shift- somewhere near 650 nm. >> >> I've always wanted to make an ionic resistor (in water) >> and measure the Johnson noise... >> >> About equally useful. >> >> George h. >>> >>> Should be, if one can arrange a comparable density of space charge, at low >>> energy, into the space of what's otherwise a normal e.g. 12AX7 cathode, >>> it'll be a paltry ~1umho transconductance. >>> >>> Would be fun to see the transit time on a nearly human scale (well, us >>> instead of ns), though. >>> >>> Tim >>> >>> -- >>> Seven Transistor Labs, LLC >>> Electrical Engineering Consultation and Contract Design >>> Website: http://seventransistorlabs.com > > Oh sorry, I thought I was responding to Phil H. > Do you know what the Lamb shift is? > > George H. > About 0.3 sheep.
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| From | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| Date | 2017-03-07 16:36 -0800 |
| Message-ID | <v8kubcp03ekbao2jrh97csdr8pf8j8r7d7@4ax.com> |
| In reply to | #450727 |
On Tue, 7 Mar 2017 15:47:59 -0800 (PST), George Herold <gherold@teachspin.com> wrote: >On Tuesday, March 7, 2017 at 4:11:46 PM UTC-5, Tim Williams wrote: >> "Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message >> news:-ZmdnV-AmY1SdyPFnZ2dnUU7-XXNnZ2d@supernews.com... >> > Tubes have a similar problem, for similar reasons. ;) >> >> Some day, I'm going to try to build a proton triode. Just to see how truly >> awful its performance is. > >Where you getting the protons? Hydrogen plasma? >(I'd love to find a cheap way to make protons... >Diode laser-Lamb shift- somewhere near 650 nm. > >I've always wanted to make an ionic resistor (in water) >and measure the Johnson noise... All resistors of a given value must have the same Johnson noise. Unless there's something electro-chemical or photoelectric or something extra going on. They don't all have to have the same shot noise. Or bubble noise. I wonder if the mass of ions changes the frequency response. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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| From | pcdhobbs@gmail.com |
|---|---|
| Date | 2017-03-08 04:40 -0800 |
| Message-ID | <29f44613-160d-433a-a33a-92b2d7f13000@googlegroups.com> |
| In reply to | #450734 |
>All resistors of a given value must have the same Johnson noise. >Unless there's something electro-chemical or photoelectric or >something extra going on. Or it isn't in thermodynamic equilibrium. A diode in the normal (not HL injection) region has a noise temperature of T_j/2. At zero bias, the reverse current equals the forward current, so you get the other half of the noise. Cheers Phil Hobbs
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| From | George Herold <gherold@teachspin.com> |
|---|---|
| Date | 2017-03-08 06:24 -0800 |
| Message-ID | <da99c646-f464-49de-b033-3edc88a708bc@googlegroups.com> |
| In reply to | #450734 |
On Tuesday, March 7, 2017 at 7:36:21 PM UTC-5, John Larkin wrote: > On Tue, 7 Mar 2017 15:47:59 -0800 (PST), George Herold > <gherold@teachspin.com> wrote: > > >On Tuesday, March 7, 2017 at 4:11:46 PM UTC-5, Tim Williams wrote: > >> "Phil Hobbs" <pcdhSpamMeSenseless@electrooptical.net> wrote in message > >> news:-ZmdnV-AmY1SdyPFnZ2dnUU7-XXNnZ2d@supernews.com... > >> > Tubes have a similar problem, for similar reasons. ;) > >> > >> Some day, I'm going to try to build a proton triode. Just to see how truly > >> awful its performance is. > > > >Where you getting the protons? Hydrogen plasma? > >(I'd love to find a cheap way to make protons... > >Diode laser-Lamb shift- somewhere near 650 nm. > > > >I've always wanted to make an ionic resistor (in water) > >and measure the Johnson noise... > > All resistors of a given value must have the same Johnson noise. > Unless there's something electro-chemical or photoelectric or > something extra going on. > > They don't all have to have the same shot noise. > > Or bubble noise. > > I wonder if the mass of ions changes the frequency response. Right it's not very useful, but I just wanted to see it with some conductor other than electrons. George H. > > > -- > > John Larkin Highland Technology, Inc > picosecond timing precision measurement > > jlarkin att highlandtechnology dott com > http://www.highlandtechnology.com
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| From | dplatt@coop.radagast.org (Dave Platt) |
|---|---|
| Date | 2017-03-07 16:55 -0800 |
| Message-ID | <rd14pd-cpm.ln1@coop.radagast.org> |
| In reply to | #450727 |
In article <e9e71fc8-f9ff-4195-a60d-7b71b62bfa61@googlegroups.com>, George Herold <gherold@teachspin.com> wrote: >Where you getting the protons? Hydrogen plasma? >(I'd love to find a cheap way to make protons... >Diode laser-Lamb shift- somewhere near 650 nm. Build a Farnsworth fusor, and chase after the neutrons until they decay? :-)
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| From | George Herold <gherold@teachspin.com> |
|---|---|
| Date | 2017-03-08 06:40 -0800 |
| Message-ID | <71d3cef2-2260-41c8-8f9c-bd27dee03498@googlegroups.com> |
| In reply to | #450739 |
On Tuesday, March 7, 2017 at 8:06:10 PM UTC-5, Dave Platt wrote: > In article <e9e71fc8-f9ff-4195-a60d-7b71b62bfa61@googlegroups.com>, > George Herold <gherold@teachspin.com> wrote: > > >Where you getting the protons? Hydrogen plasma? > >(I'd love to find a cheap way to make protons... > >Diode laser-Lamb shift- somewhere near 650 nm. > > Build a Farnsworth fusor, and chase after the neutrons until they > decay? :-) Never heard of it. https://en.wikipedia.org/wiki/Fusor Looks like it needs electrodes into glass. I'd rather avoid that. (I've seen setups with a hydrogen tube and HV electrodes, I think you have to have a way to put in more hydrogen... but I'm not sure.) We make a Rb lamp that puts a bulb in an RF magnetic field and pumps energy in. (We add another gas to help start the discharge.) I guess I should see if someone has done a similar thing with hydrogen. George H.
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| From | Piotr Wyderski <no@mail.com> |
|---|---|
| Date | 2017-03-09 07:10 +0100 |
| Message-ID | <o9qrjr$ose$1@node1.news.atman.pl> |
| In reply to | #450739 |
Dave Platt wrote: > Build a Farnsworth fusor, and chase after the neutrons until they > decay? :-) Is its neutron flux dangerous (in the typical scale of the device)? Best regards, Piotr
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| From | dplatt@coop.radagast.org (Dave Platt) |
|---|---|
| Date | 2017-03-10 21:32 -0800 |
| Message-ID | <foecpd-8l7.ln1@coop.radagast.org> |
| In reply to | #450939 |
>> Build a Farnsworth fusor, and chase after the neutrons until they >> decay? :-) > >Is its neutron flux dangerous (in the typical scale of the device)? Most of the academic/hobbyist fusors seem to peak at a few thousand, or a few tens of thousands of neutrons per second. It looks to me as if this would be a "significant but not immediately dangerous" level of exposure for someone standing close to the fusor... some from direct exposure to the neutrons, and some from beta/gamma radiation due to neutron activation of the fusor body and the table and floor and air and so forth. Might be no worse for you than an equivalent number of hours flying in a commercial airliner, where radiation from cosmic-ray exposure is quite significant. I saw one set of blog postings by a guy who claims to have achieved a much higher rate of fusion and neutron production (several orders of magnitude more; he was saying "100 milliwatts out, for 100 watts in") and that he managed to inadvertently expose himself so badly that he suffered symptoms of radiation poisoning (nausea and vomiting). So... yeah, maybe. It sounds as if it's possible to build something efficient enough, that you'd have to take significant precautions with shielding, distance, and choice of materials (to minimize neutron activation) in order to be safe.
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| From | "Tim Williams" <tiwill@seventransistorlabs.com> |
|---|---|
| Date | 2017-03-07 22:57 -0600 |
| Message-ID | <o9o2qu$ep8$1@dont-email.me> |
| In reply to | #450727 |
"George Herold" <gherold@teachspin.com> wrote in message news:e9e71fc8-f9ff-4195-a60d-7b71b62bfa61@googlegroups.com... > Where you getting the protons? Hydrogen plasma? > (I'd love to find a cheap way to make protons... Yeah, most likely. Some sort of electron bombardment thing. Not sure if it's a feasible goal to have a fairly high density of low velocity (space charge) protons coming out of such a mess. For sure, you can't have them in equilibrium with a metal, as you can with electrons. Well... What if you did nickel or palladium nanowires doped with hydrogen? With field emission, would you get protons -- freed at fairly low "work potential"? That would of course be even less effective or reliable than electron field emitters, unless proton diffusion through those materials is much faster than I imagine. I don't know that field emission can ever have as low noise as non-saturated thermionic emission can. It's chemically weird, because protons are literally the most acidic thing that can be conjured (pure Bronsted-Lowry acid incarnate). Hard to do that without screwing up the rest of the, erm, anti-cathode. Hmm... lots of possibilities, at least. That would definitely be part of the qualification: testing the noise level to verify that it's doing the physics that I think it is (or want it to be..). Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: http://seventransistorlabs.com
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| From | Winfield Hill <hill@rowland.harvard.edu> |
|---|---|
| Date | 2017-03-09 04:05 -0800 |
| Subject | Re: RF bipolars RIP, grab em while you can |
| Message-ID | <o9rgem0480@drn.newsguy.com> |
| In reply to | #450622 |
Phil Hobbs wrote...
> John Larkin wrote:
>> Winfield Hill wrote:
>>
>>>>> Lifetime buys in order.
>>
>> fast discretes are disappearing.
>
> I ordered a reel of BFG403s (basically a 17-GHz BFT25A),
> which are on LTB, and am plotting to get some SKY65050s,
> ATF38143s, ATF55143s, BFP640s, BFP650s, BFU520As, and
> a few others that are still apparently in production.
Thanks Phil, and thanks everyone else who contributed
suggested p/n. I figured it was past time for my own
lifetime order. 25 of some is enough for me, or 100
to 200 of others. It took an hour to get my Digi-Key
order ready, and by the time I finished, one item was
no longer in stock! Realizing time was critical now,
to beat other "grab-all-the-stock" buyers, I rapidly
completed the Digi-Key order and thankfully found the
other part still available at Mouser. Whoa!
--
Thanks,
- Win
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| From | pcdhobbs@gmail.com |
|---|---|
| Date | 2017-03-09 04:44 -0800 |
| Subject | Re: RF bipolars RIP, grab em while you can |
| Message-ID | <1b3f847b-5830-4e91-997b-7c25c55c3c3d@googlegroups.com> |
| In reply to | #450955 |
> Thanks Phil, and thanks everyone else who contributed > suggested p/n. I figured it was past time for my own > lifetime order. 25 of some is enough for me, or 100 > to 200 of others. It took an hour to get my Digi-Key > order ready, and by the time I finished, one item was > no longer in stock! Realizing time was critical now, > to beat other "grab-all-the-stock" buyers, I rapidly > completed the Digi-Key order and thankfully found the > other part still available at Mouser. Whoa! All part of my nefarious plot to get the chipmakers to reconsider. ;) It's sort of demoralizing designing stuff that nobody will be able to make, though. I have small hoards of some great parts such as the VA713 70-MHz OTA and some amazing Motorola dual-gate GaAs FETs, but I never seem to use them, even in one-offs. :( Hopefully having a little instruments company and hoarding reels instead of cut tapes will help. Cheers Phil Hobbs
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| From | Cursitor Doom <curd@notformail.com> |
|---|---|
| Date | 2017-03-07 17:50 +0000 |
| Message-ID | <o9mrsh$to3$2@dont-email.me> |
| In reply to | #450577 |
On Mon, 06 Mar 2017 20:44:16 -0800, John Larkin wrote: > Same issue as the phemts: fast discretes are disappearing. Perhaps we should compile a list of classic endangered discretes between us so we can stock up on 'em while we can. Not that it'll do the designers much good, but repairers and whatnot could benefit.
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| From | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| Date | 2017-03-07 11:08 -0800 |
| Message-ID | <g71ubcpbng31lfrlfl02dmm8at0mh9vuro@4ax.com> |
| In reply to | #450641 |
On Tue, 7 Mar 2017 17:50:09 -0000 (UTC), Cursitor Doom <curd@notformail.com> wrote: >On Mon, 06 Mar 2017 20:44:16 -0800, John Larkin wrote: > >> Same issue as the phemts: fast discretes are disappearing. > >Perhaps we should compile a list of classic endangered discretes between >us so we can stock up on 'em while we can. Not that it'll do the >designers much good, but repairers and whatnot could benefit. I just told Bonnie to nab 11K of the PNP transistor. That will give me time to redesign. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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| From | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| Date | 2017-03-07 11:09 -0800 |
| Message-ID | <7a1ubch6mha4a46uqcbb7bgnnldr86l5fv@4ax.com> |
| In reply to | #450664 |
On Tue, 07 Mar 2017 11:08:16 -0800, John Larkin <jjlarkinxyxy@highlandtechnology.com> wrote: >On Tue, 7 Mar 2017 17:50:09 -0000 (UTC), Cursitor Doom ><curd@notformail.com> wrote: > >>On Mon, 06 Mar 2017 20:44:16 -0800, John Larkin wrote: >> >>> Same issue as the phemts: fast discretes are disappearing. >> >>Perhaps we should compile a list of classic endangered discretes between >>us so we can stock up on 'em while we can. Not that it'll do the >>designers much good, but repairers and whatnot could benefit. > >I just told Bonnie to nab 11K of the PNP transistor. That will give me >time to redesign. Why is NXP killing off their RF parts? Why not just bump the price 5x or so? -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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| From | Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> |
|---|---|
| Date | 2017-03-07 14:34 -0500 |
| Message-ID | <YomdnaGwbv7bliLFnZ2dnUU7-UHNnZ2d@supernews.com> |
| In reply to | #450665 |
On 03/07/2017 02:09 PM, John Larkin wrote: > On Tue, 07 Mar 2017 11:08:16 -0800, John Larkin > <jjlarkinxyxy@highlandtechnology.com> wrote: > >> On Tue, 7 Mar 2017 17:50:09 -0000 (UTC), Cursitor Doom >> <curd@notformail.com> wrote: >> >>> On Mon, 06 Mar 2017 20:44:16 -0800, John Larkin wrote: >>> >>>> Same issue as the phemts: fast discretes are disappearing. >>> >>> Perhaps we should compile a list of classic endangered discretes between >>> us so we can stock up on 'em while we can. Not that it'll do the >>> designers much good, but repairers and whatnot could benefit. >> >> I just told Bonnie to nab 11K of the PNP transistor. That will give me >> time to redesign. > > Why is NXP killing off their RF parts? Why not just bump the price 5x > or so? Probably related to the Nexperia spinoff. I guess neither the Chinese nor NXP wanted their RF jellybeans. NXP started killing off the BFG series parts some years ago--I used to really like the BFG25A, which was a BFT25A but twice as fast. I did order a reel of BFG403W (the 17 GHz version), but I expect its Early voltage is fairly putrid by comparison. Still, they were on sale for 9 cents, so it was worth a roll of the dice since there won't be another chance. Next reel will be BFT92s. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
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| From | Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> |
|---|---|
| Date | 2017-03-07 15:40 -0500 |
| Message-ID | <zcCdndaLJ8ZNhyLFnZ2dnUU7-dvNnZ2d@supernews.com> |
| In reply to | #450671 |
On 03/07/2017 02:34 PM, Phil Hobbs wrote: > On 03/07/2017 02:09 PM, John Larkin wrote: >> On Tue, 07 Mar 2017 11:08:16 -0800, John Larkin >> <jjlarkinxyxy@highlandtechnology.com> wrote: >> >>> On Tue, 7 Mar 2017 17:50:09 -0000 (UTC), Cursitor Doom >>> <curd@notformail.com> wrote: >>> >>>> On Mon, 06 Mar 2017 20:44:16 -0800, John Larkin wrote: >>>> >>>>> Same issue as the phemts: fast discretes are disappearing. >>>> >>>> Perhaps we should compile a list of classic endangered discretes between >>>> us so we can stock up on 'em while we can. Not that it'll do the >>>> designers much good, but repairers and whatnot could benefit. >>> >>> I just told Bonnie to nab 11K of the PNP transistor. That will give me >>> time to redesign. >> >> Why is NXP killing off their RF parts? Why not just bump the price 5x >> or so? > > Probably related to the Nexperia spinoff. I guess neither the Chinese > nor NXP wanted their RF jellybeans. > > NXP started killing off the BFG series parts some years ago--I used to > really like the BFG25A, which was a BFT25A but twice as fast. I did > order a reel of BFG403W (the 17 GHz version), but I expect its Early > voltage is fairly putrid by comparison. Still, they were on sale for 9 > cents, so it was worth a roll of the dice since there won't be another > chance. > > Next reel will be BFT92s. The SPICE model in the BFG403W datasheet has VAF=36V, vs. 50V for the BFT25A. So not as putrid as all that. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
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