gt;>> is) in a heavy massive shimmering chrome-plated cylindrical brass
>>> enclosure, a
>>> beauty to see, It was the timebase of a tube-type synthesizer with lots of
>>> tubes. Themperature control was achieved by means of a mercury thermometer
>>> in
>>
quot;
Ogg: Re: [time-nuts] Glass Envelope Quartz Crystals
Hi
Since the 25 MHz crystal has already been soldered into a circuit, putting it
in a
socket is probably not a real good idea. It’s also a leaded part. Even with
fat pins
sockets can be an issue. With wire leads, you are asking for trou
> The dynam al capacitance is a couple of fF, and thus R1 is between 10k to 80k
> depending on the size
A friend of mine has been fighting a 32 kHz clock problem on an ARM processor
(used to wake up from periodic sleeps). In discussions with the CPU and
crystal makers it looks like some of the
Hi
They are wonderful works of industrial art. Unfortunately, except for the
strobe trick, there is not
a lot of use you can get out of them. A modern 32 KHz watch crystal is a much
more accurate
thing to use for a clock or watch. About the only exception to that broad
sweeping generalization
. Ursprüngliche Nachricht
Von: Tim Shoppa Datum: 07.02.2016 13:31
(GMT+01:00) An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] Glass Envelope Quartz Crystals
I know that the tiny modern 32kc/32.768kc tuning fork crystals continue to
produce
Hi
You can indeed pick up the 32 KHz output of the crystal with a microphone.
We used to do that and used the result to drive a counter. The information
was used to manually (yes it once was done that way) set the watch modules
on frequency.
Depending on the size and design of the crystal, the Q
I know that the tiny modern 32kc/32.768kc tuning fork crystals continue to
produce output for a second or so after power is shut off.
This leads to my guess that typical modern tuning fork crystals have a Q of
30,000 or so. I'm not sure any manufacturer actually publishes Q for their
tiny tuning f
This is a very interesting discussion. I have experimented with some audio
frequency crystals in the 3-6 kHz range. I don't know what they came out of but
it was probably some sort of FDM telephony or telegraphy equipment. They're in
the form of vacuum mounted bars with 4 plated terminals in tal
Here is a picture of one of those British made glass envelope crystals
with miniature 7 pin bases. It is marked 62.500 KC/S and came from an
old Marconi broadcast B/W TV sync generator.
https://www.dropbox.com/s/3jtadg2c9rlc42n/Glass%20crystal.jpg?dl=0
Ignacio, EB4APL
On 03/02/2016 a las 22:
To: "Discussion of precise time and frequency measurement"
Sent: Thursday, February 04, 2016 6:30 AM
Subject: Re: [time-nuts] Glass Envelope Quartz Crystals
I think it was unlikely that that it was made "just to see where it would
come out" That is a flexural bar possibly a
o.nz/~tractorb/3k1.JPG
>
> DaveB, NZ
>
> - Original Message - From: "Alan Melia"
> To: "Discussion of precise time and frequency measurement"
>
> Sent: Thursday, February 04, 2016 6:30 AM
> Subject: Re: [time-nuts] Glass Envelope Quartz Crystal
On 3 February 2016 at 19:41, Tim Shoppa wrote:
> Very interesting! Hazarding a guess higher end of a NT-cut? Looks much
> like the third from the right here:
> http://www.pbgquartz.com/www.pbgquartz.com/images/foto1.jpg
I have a GEC 1Kc/s crystal that looks like the third from right. It's
a m
On 02/02/2016 03:24 PM, Don Latham wrote:
You have it right, iovane. At the least, they should be protected from light,
thermal radiation, and emf. Won'drous things will happen if the crystal and
its structure are subjected to radiation through the glass. I'd suggest a foam
wrap in a tin can as
;>>> worked
>>>>> as a shield too. I have a similar crystal made by Racal in the 60's,
>>>>> and in my
>>>>> case it is fitted with the classic octal tube-type plug. It was housed
>>>>> (still
>>>>> is)
"
To: "Discussion of precise time and frequency measurement"
Sent: Thursday, February 04, 2016 6:30 AM
Subject: Re: [time-nuts] Glass Envelope Quartz Crystals
I think it was unlikely that that it was made "just to see where it would
come out" That is a flexural bar possib
t;Foxbat" etc.
Alan
G3NYK
- Original Message - From: "Philip Gladstone"
To:
Sent: Wednesday, February 03, 2016 1:21 PM
Subject: Re: [time-nuts] Glass Envelope Quartz Crystals
I dug around in my junk box, and found this:
https://plus.google.com/+PhilipGladstone/posts/
To:
Sent: Wednesday, February 03, 2016 1:21 PM
Subject: Re: [time-nuts] Glass Envelope Quartz Crystals
I dug around in my junk box, and found this:
https://plus.google.com/+PhilipGladstone/posts/JBNLMSq2rsE?pid=6247050011623528018&oid=115465617973526125523
This is (according to the mark
Von: time-nuts [mailto:time-nuts-boun...@febo.com] Im Auftrag von Bob Camp
Gesendet: Mittwoch, 3. Februar 2016 13:12
>There likely are long stories that explain just why this or that package got
>used in this or that application.
The historical reasons for this type of package is more relate
cussion of precise time and frequency measurement"
Ogg: Re: [time-nuts] Glass Envelope Quartz Crystals
Hi
Since the 25 MHz crystal has already been soldered into a circuit, putting it
in a
socket is probably not a real good idea. It’s also a leaded part. Even with
fat pins
sockets can be
a
>>> beauty to see, It was the timebase of a tube-type synthesizer with lots of
>>> tubes. Themperature control was achieved by means of a mercury thermometer
>>> in
>>> which mercury actuated a contact when reaching a wire crossing the capillary
>>> tube.
timebase of a tube-type synthesizer with lots
>>> of
>>> tubes. Themperature control was achieved by means of a mercury
>>> thermometer in
>>> which mercury actuated a contact when reaching a wire crossing the
>>> capillary
>>> tube.
>>>
>>
of
tubes. Themperature control was achieved by means of a mercury thermometer in
which mercury actuated a contact when reaching a wire crossing the capillary
tube.
Antonio I8IOV
Da: Bob Camp
Data: 02/02/2016 13.15
A: "Discussion of precise time and frequency measurement"
Ogg: Re: [time-nuts]
Hi
Anything that causes “delta C” between the leads is probably a bad idea. Most
3D printing materials are relatively unstable as capacitor dielectrics.
Bob
> On Feb 2, 2016, at 10:51 AM, Daniel Watson wrote:
>
> Hi,
>
> I have added a picture of the bottom of the 5 MHz crystal. The other on
o I8IOV
>
>> Da: Bob Camp
>> Data: 02/02/2016 13.15
>> A: "Discussion of precise time and frequency measurement"
>> Ogg: Re: [time-nuts] Glass Envelope Quartz Crystals
>>
>> Hi
>>
>> Since the 25 MHz crystal has already been soldered
reaching a wire crossing the capillary
> tube.
>
> Antonio I8IOV
>
>>Da: Bob Camp
>>Data: 02/02/2016 13.15
>>A: "Discussion of precise time and frequency measurement"
>>Ogg: Re: [time-nuts] Glass Envelope Quartz Crystals
>>
>>Hi
>>
>
p
>Data: 02/02/2016 13.15
>A: "Discussion of precise time and frequency measurement"
>Ogg: Re: [time-nuts] Glass Envelope Quartz Crystals
>
>Hi
>
>Since the 25 MHz crystal has already been soldered into a circuit, putting it
in a
>socket is probably not a real goo
Hi,
I have added a picture of the bottom of the 5 MHz crystal. The other one
has a similar pin arrangement, two pairs twisted and soldered together,
except they aren't cut as short. The seller indicated they were
manufactured in Russia for military use.
If a suitable socket cannot be found, I tho
Hi
Since the 25 MHz crystal has already been soldered into a circuit, putting it
in a
socket is probably not a real good idea. It’s also a leaded part. Even with fat
pins
sockets can be an issue. With wire leads, you are asking for trouble.
Functionally, there is little there is little differ
Interesting! Date code from the 90's? Russian, right?
They certainly look like common 7 pin miniature tube pattern.
But unlike a real 7 pin tube that actually has stiff Cunife or Fernico
pins, it looks like you have just tinned wires out the bottom of yours, and
your pics don't show the bottom of
Hi,
I purchased a pair of interesting glass envelope crystals for a project.
Here are some pictures:
http://syncchannel.blogspot.com/2016/02/glass-envelope-quartz-crystals.html
Does anyone have an idea about what mount/socket I should buy for these? I
read a previous thread on the list about Bli
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