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Groups > sci.electronics.design > #447203
| From | Piglet <erichpwagner@hotmail.com> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: An old "500MC biquinary counter" |
| Date | 2017-02-10 20:32 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <o7l7tq$fq1$1@dont-email.me> (permalink) |
| References | <M0mnA.448$SQ3.75@fx29.iad> <eg6ag4Fig75U1@mid.individual.net> |
On 10/02/2017 17:10, Joerg wrote: > On 2017-02-10 08:39, bitrex wrote: >> What are D1-D5? >> >> http://www.seekic.com/uploadfile/ic-circuit/s2009713233931554.gif > > > Could they be Shockley diodes? Those are similar to SCRs but without a > gate connection and can only be triggered via avalanche breakdown or dv/dt. > Yeah could be Shockley diodes (aka 4-layer diodes) but last time I saw one in a schematic the symbol was different. However they are not hi-speed parts and even in their heyday would not have seen use at 00s of kilohertz let alone megahertz. Diac is a still-available kindof breakover diode but higher voltage and bidirectional. 4-layer diodes I saw were made with breakover voltages from 8 to 22V and 5-10% tolerance. TC was remarkable good and they made good semi-precise timers (but not for nano-seconds). Diacs typically breakover 28-35V and are not tightly specified. Another option is that is just an old symbol for a zener diode? But for those speeds I reckon they must be tunnel diodes. That would tie in with the emitter coupled logic and 10mA tail current. Tunnel diodes are fast. Due to the very high doping some older ones have now diffused themselves into mush. piglet
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An old "500MC biquinary counter" bitrex <bitrex@de.lete.earthlink.net> - 2017-02-10 11:39 -0500
Re: An old "500MC biquinary counter" Joerg <news@analogconsultants.com> - 2017-02-10 09:10 -0800
Re: An old "500MC biquinary counter" "tom" <tmiller11147@verizon.net> - 2017-02-10 13:24 -0500
Re: An old "500MC biquinary counter" John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-10 11:30 -0800
Re: An old "500MC biquinary counter" pcdhobbs@gmail.com - 2017-02-10 12:36 -0800
Re: An old "500MC biquinary counter" John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-10 14:15 -0800
Re: An old "500MC biquinary counter" Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-10 13:16 -0500
Re: An old "500MC biquinary counter" John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-10 16:14 -0800
Re: An old "500MC biquinary counter" Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-10 19:19 -0500
Re: An old "500MC biquinary counter" pcdhobbs@gmail.com - 2017-02-10 10:23 -0800
Re: An old "500MC biquinary counter" Joerg <news@analogconsultants.com> - 2017-02-10 11:16 -0800
Re: An old "500MC biquinary counter" John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-10 11:27 -0800
Re: An old "500MC biquinary counter" pcdhobbs@gmail.com - 2017-02-10 12:32 -0800
Re: An old "500MC biquinary counter" bill.sloman@ieee.org - 2017-02-10 16:05 -0800
Re: An old "500MC biquinary counter" "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-11 10:28 -0600
Re: An old "500MC biquinary counter" Piglet <erichpwagner@hotmail.com> - 2017-02-10 20:32 +0000
Re: An old "500MC biquinary counter" Joerg <news@analogconsultants.com> - 2017-02-10 13:26 -0800
Re: An old "500MC biquinary counter" Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-10 12:50 -0500
Re: An old "500MC biquinary counter" Joerg <news@analogconsultants.com> - 2017-02-10 14:55 -0800
Re: An old "500MC biquinary counter" - 500 MC Bi-Quinary Counter.gif (0/1) Dave M <dgminala at mediacombb dot net> - 2017-02-10 18:41 -0600
Re: An old "500MC biquinary counter" - 500 MC Bi-Quinary Counter.gif (0/1) "Dave M" <dgminala@mediacombb.net> - 2017-02-10 18:50 -0600
Re: An old "500MC biquinary counter" - 500 MC Bi-Quinary Counter.gif (0/1) Joerg <news@analogconsultants.com> - 2017-02-10 16:58 -0800
Re: An old "500MC biquinary counter" - 500 MC Bi-Quinary Counter.gif (0/1) Clifford Heath <no.spam@please.net> - 2017-02-11 14:29 +1100
Re: An old "500MC biquinary counter" - 500 MC Bi-Quinary Counter.gif (0/1) whit3rd <whit3rd@gmail.com> - 2017-02-11 02:48 -0800
Re: An old "500MC biquinary counter" Piglet <erichpwagner@hotmail.com> - 2017-02-11 11:00 +0000
Re: An old "500MC biquinary counter" "Tom Del Rosso" <fizzbintuesday@that-google-mail-domain.com> - 2017-02-11 20:57 -0500
Re: An old "500MC biquinary counter" krw@notreal.com - 2017-02-11 22:07 -0500
Re: An old "500MC biquinary counter" Clifford Heath <no.spam@please.net> - 2017-02-12 18:21 +1100
Re: An old "500MC biquinary counter" krw@notreal.com - 2017-02-12 17:04 -0500
Re: An old "500MC biquinary counter" Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-10 14:40 -0700
Re: An old "500MC biquinary counter" bitrex <bitrex@de.lete.earthlink.net> - 2017-02-10 17:59 -0500
Re: An old "500MC biquinary counter" bitrex <bitrex@de.lete.earthlink.net> - 2017-02-10 18:04 -0500
Re: An old "500MC biquinary counter" dagmargoodboat@yahoo.com - 2017-02-11 06:41 -0800
Re: An old "500MC biquinary counter" rickman <gnuarm@gmail.com> - 2017-02-11 07:10 -0500
Re: An old "500MC biquinary counter" bitrex <bitrex@de.lete.earthlink.net> - 2017-02-11 11:36 -0500
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