Re: Microwave diode?

On Wed, 10 Dec 2008 19:09:01 -0800, JosephKK <quiettechblue@xxxxxxxxx>
wrote:

On Tue, 9 Dec 2008 11:28:09 -0500, "NoSPAM" <unknown@xxxxxxxxxx>
wrote:

"JosephKK" <quiettechblue@xxxxxxxxx> wrote in message
news:h54sj4l1fhi1t04ae35u9r3594e029j0nt@xxxxxxxxxx
On Mon, 08 Dec 2008 11:00:36 -0800, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Sat, 06 Dec 2008 10:15:54 -0800, JosephKK <quiettechblue@xxxxxxxxx>
wrote:

On Mon, 01 Dec 2008 19:47:34 +0000, Eeyore
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:



DaveC wrote:

Have simple detector circuit that specifies 1N21B diode. That diode
is
20-plus years old and obsolete. Looking for current equivalent,
possibly (but
not necessarily) smt.

Are these useable in place of a 1N21B for 2.4 GHz detection?:

<http://tinyurl.com/6g62bu>

<http://tinyurl.com/62fqnv>

"1N23B is a point contact silicon diode. For the ages that was the
closest thing to Shottkey and the diode for microwave. In a lot of
old hardware the newer shottkey diodes will easily replace the
1N23 series assuming no mechanical limitations.

FYI: the suffix specificied specific sorting of 1n23 for noise,
working frequency and threshold voltage."
http://newsgroups.derkeiler.com/Archive/Rec/rec.radio.amateur.homebrew/2005-10/msg00024.html

To compare 1N21 to 1N23 go here and download the data.
http://www.alldatasheet.com/datasheet-pdf/pdf/121950/ETC/1N23B.html

Graham

alt group trimmed

Current production 1N23 may be Silicon Schottky but the originals are
Germanium point contact. Do you remember a guy advertising as "Oliver
Germanium"? Those old 1960's and 1970's ads were memorable for that.


1N23 is still manufactured as a silicon point-contact diode...

http://www.digchip.com/datasheets/download_datasheet.php?id=14882&part-number=1N23

and I believe it always was.

John

And i suppose that 2n27 and 2n107 and 2n176 transistors were not
Germanium transistors as well in the early days.

See:

http://semiconductormuseum.com/PhotoGallery/PhotoGallery_2N27.htm

http://semiconductormuseum.com/PhotoGallery/PhotoGallery_2N107.htm

http://semiconductormuseum.com/PhotoGallery/PhotoGallery_Motorola_2N176.htm

And even the venerated (in some places) CK722 is germanium:

http://www.ck722museum.com/

History is.

Early 1n23 devices were Germanium. Current devices not so much.



Actually,the 1N21 and 1N23 diodes were silicon from the beginning. Your
arguments about germanium might sound logical, but they have nothing to do
with the history of silicon devices being used for microwave detectors and
mixers. In fact, silicon point-contact diodes were in use from the
earliest days of radio - even predating the invention of the vacuum tube.

An article published in THE Bent [a quarterly publication of Tau Beta Pi -
the national engineering honor society], by Dr. Frederick Seitz goes into
the early history of silicon devices. A copy of this article,The Tangled
Prelude to the Age of Silicon Electronics,.may be found at:
http://sco.theporch.com:8000/reguser/archives/BOATANCHORS/library/the.silicon.age.begins.txt.

I do ask that the copyright of this article be respected. To read the
article, you will need to register as a user at
http://sco.theporch.com:8000/.

Dr. Barry L. Ornitz [SC A '65]



OK. I have not been able to properly support my case.


Support your case? That 1N23's were originally germanium diodes?

John

.

Relevant Pages

  • Re: Microwave diode?
    ... Germanium point contact. ... Actually,the 1N21 and 1N23 diodes were silicon from the beginning. ... Your arguments about germanium might sound logical, but they have nothing to do with the history of silicon devices being used for microwave detectors and mixers. ...
    (sci.electronics.design)
  • Re: Microwave diode?
    ... "1N23B is a point contact silicon diode. ... Germanium point contact. ... Actually,the 1N21 and 1N23 diodes were silicon from the beginning. ... the early history of silicon devices. ...
    (sci.electronics.design)
  • Re: Microwave diode?
    ... "1N23B is a point contact silicon diode. ... Germanium point contact. ... Actually,the 1N21 and 1N23 diodes were silicon from the beginning. ... the early history of silicon devices. ...
    (sci.electronics.design)
  • Re: Microwave diode?
    ... "1N23B is a point contact silicon diode. ... Germanium point contact. ... Actually,the 1N21 and 1N23 diodes were silicon from the beginning. ... the early history of silicon devices. ...
    (sci.electronics.design)
  • Re: Microwave diode?
    ... "1N23B is a point contact silicon diode. ... Germanium point contact. ... Actually,the 1N21 and 1N23 diodes were silicon from the beginning. ... the early history of silicon devices. ...
    (sci.electronics.design)