Chip with simple program for Toy

[Jamie]

"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message news:47D49997.5487D9DB@earthlink.net...

"Michael A. Terrell" wrote:

"Jan Panteltje" <pNaonStpealmtje@yahoo.com> wrote in message
news:fr1h5v$fte$1@news.datemas.de...
The card has a CS (Chip Select) line, when no activity there for some
time
you could take that as 'done', but there is a lot more to SD card
protocols.

CS is only a momentary access line, not a good source to detect "Finish"
signal.

Default, you have to look at the power line of your SD card or your Camera
power source, if you want the external controller to shut off the camera
then you're having a difficult task, it should be the other way around.

--
Service to my evil master? Been there, Done that, and I've got my DD666 to
prove it.
Member of DAV #666.

Michael A. Terrell
Central Florida


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

Why don't you two shit eaters get lost? I don't give a shit about your personal conflict.

 

[Jamie]

"Marra" <cresswellavenue@talktalk.net> wrote in message news:6b3dc0ef-3f85-43bc-82fb-d5ff5279c866@n77g2000hse.googlegroups.com...
On Mar 9, 7:40 pm, default <defa...@defaulter.net> wrote:

I have an SD card in a camera. I want to use a controller to work the
camera. The construction of the camera doesn't lend itself to just
putting a scope on the SD card while it is working.

What I would like is some way to tell the controller that the picture
the camera just finished taking is in memory and it is OK to shut off
the camera. Is there some handshaking line that I could use to tell
when the card is being accessed and when it is just sitting there
waiting?
--

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---= - Total Privacy via Encryption =---

Dead easy the LED flashes until the picture is in memory !



Good point dundfuck, the question is, how do you get to the LED in a camera? Break it with a hammer?

 

[billcalley]

On Mar 29 2006, 5:34 pm, "billcalley" <billcal...@yahoo.com> wrote:

Hi All,

When reading descriptions on the operation of JFETs, I
repeatedly
see mention of "pinch-off". Some books on JFETs describepinch-off
as the point that the drain-to-source voltage (Vds) is just high
enough
so as not to affect the drain current if Vds happens to increase;
while
other books describepinch-offas the point that the JFET's gate bias
is negative enough to shut down, or "pinch-off", all the drain
current. Which is correct?

Thanks!

-Bill

I happened to find this thread and thought I would comment.

To understand the JFET pinch-off one needs to understand the mechanism
of current flow. The channel in a JFET is a resistive material with a
certain cross-sectional area. As a voltage, Vds, is applied across the
resistive material a current flows (ohm's law). The gate is implanted/
diffused into the resistive material using a doping of type opposite
to the channel (N in P channel, P in N channel). This PN junction
forms a depletion region (low carrier concentration), which restricts
the cross-sectional area. Increasing the reverse bias on the gate-
channel junction increases the width of the depletion region. For a N-
channel JFET, the reverse bias at the source end of the channel is -
Vgs. The reverse bias at the drain end is -Vgd. Since the drain
voltage, Vd, is larger than the source voltage, Vs, the reverse bias
at the drain end is larger than the reverse bias at the source end.
Thus, the depletion region at the drain is larger than that at the
source and the current is more restricted at the drain end than the
source end. As the drain voltage continues to increase (with fixed
gate voltage), the channel area continues to narrow. At some point,
the decrease in cross-sectional area (due to increased Vd) counteracts
the effect of the increased resistive conduction (also due to
increased Vd). At this point, the device stops behaving like a
resistor and acts more like a current source with the amount of
current controlled on the source end. The point at which the
constriction counteracts the increased lateral field (Vds), is known
as the pinch-off point. The voltage from gate-to-drain at which this
happens is Vp.

So the device is pinched off when:

Vd-Vg>-Vp (sign convention on Vp)
Vd-Vs+Vs-Vg>-Vp
Vds>Vgs-Vp=Vds,sat
So for Vds>Vds,sat the output current is roughly constant (with
constant Vgs)

This is what Bill refers to with his first definition.


Now, let look at what happens on the source end. Like the drain, when
the source voltage increases to a certain point relative to the gate
voltage, the depletion region on the source side "pinches-off" the
channel. Assuming, Vds>0, then the entire channel is pinched off (if
Vds<0, you have reversed the definition of source and drain). There is
no current flow.
This happens when:
Vs-Vg>-Vp
-Vgs>-Vp
Vgs<Vp

This is what Bill refers to with his second definition.

Regards,

Art Kalb
Amplifier Design
Analog Devices, Inc.

 

[Joerg]

ronwer wrote:

Hi!

I am doing a study into the early use of silicon diodes in radar and
communication equipment during the Second World War.

What I would be interested in is as follows:

-type numbers of the diodes
-name/type number of radar/communication equipment
-technical infor on those systems
-info on producers
-pictures of actual diodes, also "in" the circuits
-anecdotal stories about the actual use
-anything else!

The information will be used for an on-going study project related to
practical application of minerals (i.e. quartz) in industry and technology.

So, since this is an aspect of a broader study, other quartz-related info
would
be most appreciated, especially about early use of piezoelectric
quartz crystals in electronic equipment.

If you'd prefer, answering off-list is possible:

neo.dymium@yahoo.com


Thanks for ANY help!

Probably you could start by finding information about this gear but
there would have to be someone on the team who can understand German:
http://www.100-jahre-radar.de/index.html?/gdr_5_deutschefunkmesstechnikim2wk.html

Many such sites have links to British and American gear but often also
in German. Another option are senior centers. A few of the EEs from
those days are still alive but there won't be much time left.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

 

[John Fields]

On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
<neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:

Hi!

I am doing a study into the early use of silicon diodes in radar and
communication equipment during the Second World War.

What I would be interested in is as follows:

-type numbers of the diodes

---
1N23 is a good place to start.
---

-name/type number of radar/communication equipment
-technical infor on those systems
-info on producers
-pictures of actual diodes, also "in" the circuits

---
http://www.google.com/search?hl=en&q=1N23+pictures

JF

 

[John Fields]

On Sat, 12 Apr 2008 11:24:19 -0500, John Fields
<jfields@austininstruments.com> wrote:

On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:

Hi!

I am doing a study into the early use of silicon diodes in radar and
communication equipment during the Second World War.

What I would be interested in is as follows:

-type numbers of the diodes

---
1N23 is a good place to start.

---
Oops... brain fart.

The 1N23 didn't appear until the '50's, I believe.

JF

 

[Michael A. Terrell]

John Fields wrote:

On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:

Hi!

I am doing a study into the early use of silicon diodes in radar and
communication equipment during the Second World War.

What I would be interested in is as follows:

-type numbers of the diodes

---
1N23 is a good place to start.

I still have one, wrapped in the lead foil that was surplused from
some earlier WE microwave relay equipment. From the looks of it, it was
probably made for 'White Alice'.


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[Michael Black]

On Sat, 12 Apr 2008, ronwer wrote:

Hi!

I am doing a study into the early use of silicon diodes in radar and
communication equipment during the Second World War.

Then you want to find a copy of "The Invention That Changed the World" by

Robert Buderi), which is about radar development during WWII, but also
about how that need for radar pushed electronics further (and how
that push helped electronics to move along after the war).

You have it wrong, silicon diodes weren't used in radar, radar caused
development of semiconductor diodes so they could be used in radar.

They had to use increasingly higher frequencies to get the fine
detail they needed/wanted, and that stretched the limit of vacuum
tubes at the time. Hence they flashed back to the early days of
radio, looked at "cat's whisker" detectors, and compacted that
into more reliable and small devices. Gone were the finicky adjustment
for the hot spot, they got it right once and then sealed it all up.

But, those early diodes were point contact like the cat's whisker
detectors, and as far as I know, they were germanium.

But they were seeing use not as detectors like in "crystal radios"
but as mixers to get the microwave frequencies down to where tubes
could amplify the signals.

It sure seems like you are looking in the wrong direction, expecting
semiconductor diodes to exist before the war, when really the war
caused them to be developed.

Scratch any piece of equipment that did use semiconductor diodes
in WWII, and you are most likely to find that the development of
the equipment involved development of semiconductor diodes.

After the war you see trends moving away from that scenario, where
general diodes were developed independent of specific use, which in
turn caused electronics to move forward which also in turn caused
the need for semiconductors to develop.

The case has been made that the development of the transistor was
based on that work on semiconductor diodes during the war.

What I would be interested in is as follows:

-type numbers of the diodes
-name/type number of radar/communication equipment
-technical infor on those systems
-info on producers
-pictures of actual diodes, also "in" the circuits
-anecdotal stories about the actual use
-anything else!

The information will be used for an on-going study project related to
practical application of minerals (i.e. quartz) in industry and technology.

So, since this is an aspect of a broader study, other quartz-related info
would
be most appreciated, especially about early use of piezoelectric
quartz crystals in electronic equipment.

Then you've completely missed the one thing that people will think of

when they think "quartz".

Quartz is used in crystals, ie frequency determining elements. Going
back to at least the 1920s. Blanks of quartz sliced thin and then
ground to resonate at a certain frequency. INitially not that much
more than a novelty, then it saw a lot of use, and it continues today,
even though nowadays it's levelled off as frequency synthesis allows
a single crystal to generate multiple frequencies, unlike WWII or even
into the early seventies where you needed a single crystal for every
frequency you wanted to generate (some of that WWII equipment was
loaded with crystals).

Indeed, you don't hear much about quartz used to make semiconductor
devices, so I'm not even sure if your premise on that account is
correct.

Michael

If you'd prefer, answering off-list is possible:

neo.dymium@yahoo.com


Thanks for ANY help!


Ronald
Norway

 

[Michael A. Terrell]

"Michael A. Terrell" wrote:

John Fields wrote:

On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:

Hi!

I am doing a study into the early use of silicon diodes in radar and
communication equipment during the Second World War.

What I would be interested in is as follows:

-type numbers of the diodes

---
1N23 is a good place to start.

I still have one, wrapped in the lead foil that was surplused from
some earlier WE microwave relay equipment. From the looks of it, it was
probably made for 'White Alice'.

Actually, I think it is a 1N21.

Here is a web page selling some of the early microwave diodes:
http://www.sphere.bc.ca/test/rf-diodes.html


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[Don Bowey]

On 4/12/08 9:31 AM, in article
KqmdnRpvIuJgfp3VnZ2dnUVZ_hGdnZ2d@earthlink.com, "Michael A. Terrell"
<mike.terrell@earthlink.net> wrote:

John Fields wrote:

On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:

Hi!

I am doing a study into the early use of silicon diodes in radar and
communication equipment during the Second World War.

What I would be interested in is as follows:

-type numbers of the diodes

---
1N23 is a good place to start.


I still have one, wrapped in the lead foil that was surplused from
some earlier WE microwave relay equipment. From the looks of it, it was
probably made for 'White Alice'.

In which case it was likely used in the FPS19 radar or/and the Tropo systems
if my memory isn't fractured. But the early Projects were begun in the 50s.

John's post reprogrammed my erroneous thought that the 1N23 is germanium.
It is the 1N21 that is germanium, and likely existed in the 40s.

 

[Joerg]

ronwer wrote:

Probably you could start by finding information about this gear but there
would have to be someone on the team who can understand German:
http://www.100-jahre-radar.de/index.html?/gdr_5_deutschefunkmesstechnikim2wk.html

Many such sites have links to British and American gear but often also in
German. Another option are senior centers. A few of the EEs from those
days are still alive but there won't be much time left.

--
Regards, Joerg


Thanks! I will check this out. German is no problem whatsoever!

Best regards,

Ronald
Norway

Ah, Norway. Then you might even find some WW-II veterans from the German
side. I've met a few when I was younger. Some had been stationed there
and liked it so much that they later moved to Scandinavia or bought a
summer house there. One friend of mine would have known a lot about
these Radars but unfortunately he passed away. He went on vacation to
Norway pretty much every year.

In contrast to today the guys at the sites were intimately familiar with
the circuitry because they had to repair this stuff on the component level.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

 

[Don Bowey]

On 4/12/08 10:53 AM, in article EcidnT5o-K1rap3V4p2dnAA@telenor.com,
"ronwer" <neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:

Then you want to find a copy of "The Invention That Changed the World" by
Robert Buderi), which is about radar development during WWII, but also
about how that need for radar pushed electronics further (and how
that push helped electronics to move along after the war).

Thanks, I will try Amazon!

You have it wrong, silicon diodes weren't used in radar, radar caused
development of semiconductor diodes so they could be used in radar.

They had to use increasingly higher frequencies to get the fine
detail they needed/wanted, and that stretched the limit of vacuum
tubes at the time. Hence they flashed back to the early days of
radio, looked at "cat's whisker" detectors, and compacted that
into more reliable and small devices. Gone were the finicky adjustment
for the hot spot, they got it right once and then sealed it all up.

But, those early diodes were point contact like the cat's whisker
detectors, and as far as I know, they were germanium.

I read the book "The entangled history of silicon" where they mention the
use of silison in diodes for use in radar. The silicon was imported from the
USA (was it from Bell Laboratories? Don't remember right now and I don't
have the book here).

Indeed, those were point contact diodes.

But they were seeing use not as detectors like in "crystal radios"
but as mixers to get the microwave frequencies down to where tubes
could amplify the signals.

It sure seems like you are looking in the wrong direction, expecting
semiconductor diodes to exist before the war, when really the war
caused them to be developed.

No, they existed before the war too, but it was the demand for better radar
(i.e. higher frequencies) that speeded up the development.

See for instance: http://www.avtechpulse.com/faq.html/IX/


Scratch any piece of equipment that did use semiconductor diodes
in WWII, and you are most likely to find that the development of
the equipment involved development of semiconductor diodes.

After the war you see trends moving away from that scenario, where
general diodes were developed independent of specific use, which in
turn caused electronics to move forward which also in turn caused
the need for semiconductors to develop.

The case has been made that the development of the transistor was
based on that work on semiconductor diodes during the war.

What I would be interested in is as follows:

-type numbers of the diodes
-name/type number of radar/communication equipment
-technical infor on those systems
-info on producers
-pictures of actual diodes, also "in" the circuits
-anecdotal stories about the actual use
-anything else!

The information will be used for an on-going study project related to
practical application of minerals (i.e. quartz) in industry and
technology.

So, since this is an aspect of a broader study, other quartz-related info
would
be most appreciated, especially about early use of piezoelectric
quartz crystals in electronic equipment.

Then you've completely missed the one thing that people will think of
when they think "quartz".

Quartz is used in crystals, ie frequency determining elements. Going
back to at least the 1920s. Blanks of quartz sliced thin and then
ground to resonate at a certain frequency. INitially not that much
more than a novelty, then it saw a lot of use, and it continues today,
even though nowadays it's levelled off as frequency synthesis allows
a single crystal to generate multiple frequencies, unlike WWII or even
into the early seventies where you needed a single crystal for every
frequency you wanted to generate (some of that WWII equipment was
loaded with crystals).

The WECo L4 SSB Carrier System was an exception to that. It was designed
pre-war, and the "long haul" system was in service in many areas of the US
prior to 1950. I didn't get my hands into one until 1955.

It used a synchronized (motor driven capacitor) 4kHz oscillator driving a
harmonic generator from which crystal filters picked off the desired
harmonic for the chores of channel generation, and the frequency stacking of
channel groups into the modules of Groups and Supergroups creating systems
of 420, 600, or 720 channels extending from 64kHz to 3.096 Mhz, depending on
vintage and service needs.

The west coast was synchronized from Sacramento using a 64kHz pilot "tone."

The quartz filters were awesome.

Indeed, you don't hear much about quartz used to make semiconductor
devices, so I'm not even sure if your premise on that account is
correct.

Quartz is extensively used in semiconductor devices as isolator between the
individual components.

But I am basically interested in anything related to the use of quartz in
technology, and therefor also in silicon. They belong together.

Thanks for your reply!

Best regards,

Ronald
Norway

 

[Michael A. Terrell]

Richard Henry wrote:

On Apr 12, 9:51 am, "Michael A. Terrell" <mike.terr...@earthlink.net
wrote:
"Michael A. Terrell" wrote:

John Fields wrote:

On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
neo.dymium.removethisfi...@dontwantspam.yahoo.com> wrote:

Hi!

I am doing a study into the early use of silicon diodes in radar and
communication equipment during the Second World War.

What I would be interested in is as follows:

-type numbers of the diodes

---
1N23 is a good place to start.

I still have one, wrapped in the lead foil that was surplused from
some earlier WE microwave relay equipment. From the looks of it, it was
probably made for 'White Alice'.

Actually, I think it is a 1N21.

Here is a web page selling some of the early microwave diodes:http://www.sphere.bc.ca/test/rf-diodes.html

I don't have all the volumes of the Radiation Lab series. Is this
covered in there anywhere?

I don't have any of the Rad Lab MIT books, but I do have Skolink's
RADAR book, somewhere. It isn't on the shelves in my library, so it must
be in one of the stacks of boxes of books, waiting on more shelves to be
built.


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[John Fields]

On Sat, 12 Apr 2008 19:53:39 +0200, "ronwer"
<neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:

Quartz is extensively used in semiconductor devices as isolator between the
individual components.

---
Not exactly. What you're talking about there is amorphous silicon
dioxide, which is silicon dioxide, just like quartz, but it has no
crystal structure and it isn't piezoelectric.
---

But I am basically interested in anything related to the use of quartz in
technology, and therefor also in silicon. They belong together.

---
Then you should be equally interested in oxygen, since it's the other
constituent of quartz.

JF

 

[John Fields]

On Sat, 12 Apr 2008 15:03:30 -0500, John Fields
<jfields@austininstruments.com> wrote:

On Sat, 12 Apr 2008 19:53:39 +0200, "ronwer"
neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:


Quartz is extensively used in semiconductor devices as isolator between the
individual components.

---
Not exactly. What you're talking about there is amorphous silicon
dioxide, which is silicon dioxide, just like quartz, but it has no
crystal structure and it isn't piezoelectric.
---

---
Ergo, it ain't quartz...
---

But I am basically interested in anything related to the use of quartz in
technology, and therefor also in silicon. They belong together.

---
Then you should be equally interested in oxygen, since it's the other
constituent of quartz.

JF
JF

 

[Richard Henry]

On Apr 12, 9:51 am, "Michael A. Terrell" <mike.terr...@earthlink.net>
wrote:

"Michael A. Terrell" wrote:

John Fields wrote:

On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
neo.dymium.removethisfi...@dontwantspam.yahoo.com> wrote:

Hi!

I am doing a study into the early use of silicon diodes in radar and
communication equipment during the Second World War.

What I would be interested in is as follows:

-type numbers of the diodes

---
1N23 is a good place to start.

   I still have one, wrapped in the lead foil that was surplused from
some earlier WE microwave relay equipment. From the looks of it, it was
probably made for 'White Alice'.

   Actually, I think it is a 1N21.

   Here is a web page selling some of the early microwave diodes:http://www.sphere.bc.ca/test/rf-diodes.html

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Use any search engine other than Google till they stop polluting USENET
with porn and junk commercial SPAM- Hide quoted text -

- Show quoted text -

I don't have all the volumes of the Radiation Lab series. Is this
covered in there anywhere?

 

[Tom Bruhns]

On Apr 12, 8:51 am, "ronwer"
<neo.dymium.removethisfi...@dontwantspam.yahoo.com> wrote:

Hi!

I am doing a study into the early use of silicon diodes in radar and
communication equipment during the Second World War.

What I would be interested in is as follows:

-type numbers of the diodes
-name/type number of radar/communication equipment
-technical infor on those systems
-info on producers
-pictures of actual diodes, also "in" the circuits
-anecdotal stories about the actual use
-anything else!

The information will be used for an on-going study project related to
practical application of minerals (i.e. quartz) in industry and technology.

So, since this is an aspect of a broader study, other quartz-related info
would
be most appreciated, especially about early use of piezoelectric
quartz crystals in electronic equipment.

If you'd prefer, answering off-list is possible:

neo.dym...@yahoo.com

Thanks for ANY help!

Ronald
Norway

I thought at that point in time, practical diodes were all germanium
point contact types, at least the ones used for RF detection. But I
see from some web searching that I was wrong about that. The series
of articles at this site may be interesting:
http://www.computerhistory.org/semiconductor/timeline/1940-Discovery.html.
That page mentions that the P-N junction was discovered by a
researcher using purified silicon in 1940. Robert Buderi's book, "The
Invention that Changed the World: How a small group of radar pioneers
won the Second World War and launched a technological revolution,"
might be a good place to do some research too. I'd have a look in it
to see what he says about silicon diodes, but my copy is at my office
at the moment.

Quartz crystals for frequency control were used somewhat before that.
This paper: http://www.ieee-uffc.org/fc_history/bottom.html says that
a piece of quartz was used to control the frequency of an oscillator
in 1919. Perhaps that is the first. I know there was a lot of
interest in quartz crystals among amateur radio operators/builders in
the 1930's. If you can find copies of QST or other ham magazines from
that era, I'll bet you can find articles about quartz crystals.

Cheers,
Tom

 

[Michael A. Terrell]

Neodymium wrote:

I googled for 1N23, some say germanium, others silicon...

But you are sure it IS silicon!?

One datasheet I found was in Japanese/Chineze, and the other didn't mention
Si/Ge at all. Max f=9,325 GHz

It's hard surfing effectively with only 56 kbs at a hilltop far from the
civilized world.

At Wikipedia they said germanium:

http://en.wikipedia.org/wiki/RMA_tube_designation

I am out on a job, but when I get back in Mai I can check my own sample with
a multimeter, that will give a result.

Be careful. Those early diodes were very fragile. They were easy to
damage with static, or over current. The military had a special test
set for them. You might luck out and find the schematic online. The link
I posted in another message had the Test Set model number TS-286C/U
listed.



http://www.avtechpulse.com/faq.html/ might be of interest, as well.

http://prola.aps.org/abstract/RMP/v67/i2/p397_1






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[John Larkin]

On Sun, 13 Apr 2008 21:27:04 +0200, "Neodymium" <neo.dymium@yahoo.com>
wrote:

Volume 15 of the MIT RadLab books, "Crystal Rectifiers" 440 pages, is
all about that. History, theory, parts, applications. Appendix D lists
the common mixer types. The history part mentions early mineral-based
rectifiers.

Some interesting sections are one which notes that some diodes have
power gain when used as mixers, and a suggestion that semiconductor
triodes should be possible, and some interesting 100-volt
welded-junction "power" diodes.

Volume 16, "Microwave Mixers" has some more stuff.

These books show up on ebay, or a used-book thing like Alibris.

OK, thanks for the titles, will definitely look for them on eBay or Amazone.
Alibris is new to me, but I'll check.


I think Bliley Corp may have some papers on the history of quartz
crystals. They, along with the point-contact diode, helped to win the
war.

I will definitely try Bliley!

But otherwise, yes, that is one of the important issues I want to document:
to what extent where these components decisive for the outcome of the war.
Interesting stuff, good for the museum expositions I am working on!

Ronald
Norway

Also look into mica capacitors, and the use of mica as structural
insulators in vacuum tubes and as a filler in phenolic sockets and
such. Mica is unique: it's a good dielectric, a great high-temperature
insulator and support, and naturally fractures into high-quality
transparant sheets of nearly any desired thickness, yet is easily
sheared and punched.

John

 

[Richard Henry]

On Apr 12, 11:45 am, Richard Henry <pomer...@hotmail.com> wrote:

On Apr 12, 9:51 am, "Michael A. Terrell" <mike.terr...@earthlink.net
wrote:





"Michael A. Terrell" wrote:

John Fields wrote:

On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
neo.dymium.removethisfi...@dontwantspam.yahoo.com> wrote:

Hi!

I am doing a study into the early use of silicon diodes in radar and
communication equipment during the Second World War.

What I would be interested in is as follows:

-type numbers of the diodes

---
1N23 is a good place to start.

   I still have one, wrapped in the lead foil that was surplused from
some earlier WE microwave relay equipment. From the looks of it, it was
probably made for 'White Alice'.

   Actually, I think it is a 1N21.

   Here is a web page selling some of the early microwave diodes:http://www.sphere.bc.ca/test/rf-diodes.html

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- Show quoted text -

I don't have all the volumes of the Radiation Lab series.  Is this
covered in there anywhere?- Hide quoted text -

- Show quoted text -

After a little research, I found that the entire RadLab series was
converted to CDs some time ago. However, I haven't anywhere to buy
them.