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Sylvia Else
Guest

Thu Dec 27, 2018 1:45 pm   



https://au.rs-online.com/web/p/crystal-oscillators/1485663/

$142.20

Is this the crystal oscillator equivalent of those absurdly expensive
speaker cables?

Sylvia.

Waussie
Guest

Thu Dec 27, 2018 1:45 pm   



On 27-Dec-18 7:45 PM, Sylvia Else wrote:
Quote:
https://au.rs-online.com/web/p/crystal-oscillators/1485663/

$142.20

Is this the crystal oscillator equivalent of those absurdly expensive
speaker cables?

Sylvia.


What about a low brow cable M12 M<=>F 5 meters long for less than a dollar.

What am I missing?


<https://www.x-on.com.au/DetailsPage/PhoenixContact/1415145/?ID=4FvjxTPqnhuSIwsdOaJwLQ==&SID=S8ORG7NXcIp6ajh4wJkEyA==>


Guest

Thu Dec 27, 2018 2:45 pm   



On Thursday, December 27, 2018 at 10:45:35 PM UTC+11, Sylvia Else wrote:
Quote:
https://au.rs-online.com/web/p/crystal-oscillators/1485663/

$142.20

Is this the crystal oscillator equivalent of those absurdly expensive
speaker cables?


It looks like a fairly tightly specified crystal - one way of getting tight specification parts is to make a lot, test them all, and sort them into progressively narrower bins, and charge enough to stop people emptying the best bins too fast.

The 1N821 to 1N829 reference diode range seems to have worked that way.

http://www.farnell.com/datasheets/327542.pdf

The audiophool products are aimed at less discriminating buyers.

Radio Spares always was a slightly shady supplier - you never knew quite whose parts you were going to get - but they didn't actually go after the audiophool customers.

--
Bill Sloman, Sydney

amdx
Guest

Thu Dec 27, 2018 2:45 pm   



On 12/27/2018 5:51 AM, Waussie wrote:
Quote:
On 27-Dec-18 7:45 PM, Sylvia Else wrote:
https://au.rs-online.com/web/p/crystal-oscillators/1485663/

$142.20

Is this the crystal oscillator equivalent of those absurdly expensive
speaker cables?

Sylvia.

What about a low brow cable M12 M<=>F 5 meters long for less than a dollar.

What am I missing?


https://www.x-on.com.au/DetailsPage/PhoenixContact/1415145/?ID=4FvjxTPqnhuSIwsdOaJwLQ==&SID=S8ORG7NXcIp6ajh4wJkEyA==

That seems like it is mispriced! In quantities of 1000 it is only
$0.20, it would seem the connectors are worth 10 times that.
Mikek

Robert Lacoste
Guest

Thu Dec 27, 2018 3:45 pm   



"Sylvia Else" wrote in message news:g8jsarFr28fU1_at_mid.individual.net...
Quote:
https://au.rs-online.com/web/p/crystal-oscillators/1485663/
$142.20
Is this the crystal oscillator equivalent of those absurdly expensive
speaker cables?


Probably a quote error from RS. Exactly the same manufacturer reference (IQD
LFPTXO000295) is priced 40-45Eur by Farnell, Digikey or Mouser. Still not
cheap, but that's a 1ppm VTCXO...

Robert

Tom Gardner
Guest

Thu Dec 27, 2018 3:45 pm   



On 27/12/18 13:19, bill.sloman_at_ieee.org wrote:

Quote:
Radio Spares always was a slightly shady supplier - you never knew quite
whose parts you were going to get - but they didn't actually go after the
audiophool customers.


Infamously their 741s never had zero offset voltage, but the Vos
was distinctly bimodal and near the limit.

But the "whichever supplier is cheapest" is to be seen in many
places, from some PCB suppliers to Farnell's "multicomp".


Guest

Thu Dec 27, 2018 4:45 pm   



On Thursday, 27 December 2018 11:45:35 UTC, Sylvia Else wrote:
Quote:
https://au.rs-online.com/web/p/crystal-oscillators/1485663/

$142.20

Is this the crystal oscillator equivalent of those absurdly expensive
speaker cables?

Sylvia.


It's RS, what did you expect?


NT

John Larkin
Guest

Thu Dec 27, 2018 8:45 pm   



On Thu, 27 Dec 2018 22:45:30 +1100, Sylvia Else <sylvia_at_email.invalid>
wrote:

Quote:
https://au.rs-online.com/web/p/crystal-oscillators/1485663/

$142.20

Is this the crystal oscillator equivalent of those absurdly expensive
speaker cables?

Sylvia.


That's worth maybe $7. We buy one Fox TCVCXO for about $2.25 in modest
quantity.

You can get a seriously good OCXO for around $70 these days.




--

John Larkin Highland Technology, Inc trk

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com


Guest

Fri Dec 28, 2018 3:45 am   



On Friday, December 28, 2018 at 6:42:24 AM UTC+11, John Larkin wrote:
Quote:
On Thu, 27 Dec 2018 22:45:30 +1100, Sylvia Else <sylvia_at_email.invalid
wrote:

https://au.rs-online.com/web/p/crystal-oscillators/1485663/

$142.20

Is this the crystal oscillator equivalent of those absurdly expensive
speaker cables?

That's worth maybe $7. We buy one Fox TCVCXO for about $2.25 in modest
quantity.


Curiously, John Larkin hasn't posted the exact part number or a link to the specification sheet for the part he can buy for $2.25.

Granting his grasp of electronic design, he may not see the point.

> You can get a seriously good OCXO for around $70 these days.

A crystal oscillator in an oven runs hot (or always used to - a Peltier junction could let you stabilise it's temperature close to room temperature).

This means that it eats power, and ages fast.

Since John can't be bothered to quantify what he means by "seriously good" this isn't a particularly useful observation.

--
Bill Sloman, Sydney


Guest

Fri Dec 28, 2018 3:45 am   



On Friday, December 28, 2018 at 1:26:45 AM UTC+11, Tom Gardner wrote:
Quote:
On 27/12/18 13:19, bill.sloman_at_ieee.org wrote:

Radio Spares always was a slightly shady supplier - you never knew quite
whose parts you were going to get - but they didn't actually go after the
audiophool customers.

Infamously their 741s never had zero offset voltage, but the Vos
was distinctly bimodal and near the limit.

But the "whichever supplier is cheapest" is to be seen in many
places, from some PCB suppliers to Farnell's "multicomp".


Farnell did at least sell stuff that was identified as coming from a particular manufacturer, as well as stuff from "whoever is cheapest today".

--
Bill Sloman, Sydney

Waussie
Guest

Fri Dec 28, 2018 7:45 am   



On 27-Dec-18 9:42 PM, amdx wrote:
Quote:
On 12/27/2018 5:51 AM, Waussie wrote:
On 27-Dec-18 7:45 PM, Sylvia Else wrote:
https://au.rs-online.com/web/p/crystal-oscillators/1485663/

$142.20

Is this the crystal oscillator equivalent of those absurdly expensive
speaker cables?

Sylvia.

What about a low brow cable M12 M<=>F 5 meters long for less than a
dollar.

What am I missing?


https://www.x-on.com.au/DetailsPage/PhoenixContact/1415145/?ID=4FvjxTPqnhuSIwsdOaJwLQ==&SID=S8ORG7NXcIp6ajh4wJkEyA==

  That seems like it is mispriced! In quantities of 1000 it is only
$0.20, it would seem the connectors are worth 10 times that.
                                 Mikek


You're probably right. If it was on Alibaba then maybe it would be correct!


Guest

Fri Dec 28, 2018 9:45 am   



On Thu, 27 Dec 2018 18:19:39 -0800 (PST), bill.sloman_at_ieee.org wrote:

Quote:

You can get a seriously good OCXO for around $70 these days.

A crystal oscillator in an oven runs hot (or always used to - a Peltier junction could let you stabilise it's temperature close to room temperature).


Some relatively low frequency crystals have a parabolic frequency vs
temperature curve. The crystal is then cut to have zero Tc at the top
of parabola at the desired operating temperature. Thus, if higher oven
temperatures are used, the crystal must be cut for that temperature.

>This means that it eats power, and ages fast.

The power consumption is an issue, if mains power is not always
available and you have to use batteries to maintain temperature. I
once used an oscillator in a thermos bottle to minimize oven heat
losses.

whit3rd
Guest

Fri Dec 28, 2018 11:45 am   



On Friday, December 28, 2018 at 12:21:32 AM UTC-8, upsid...@downunder.com wrote:
Quote:
On Thu, 27 Dec 2018 18:19:39 -0800 (PST), bill.sloman_at_ieee.org wrote:


You can get a seriously good OCXO for around $70 these days.

This means that it eats power, and ages fast.

The power consumption is an issue, if mains power is not always
available and you have to use batteries to maintain temperature. I
once used an oscillator in a thermos bottle to minimize oven heat
losses.


I've seen 'em in cans with fiberglass insulation, and in small thermos bottles,
as well as what looks like hermetic sealed cases. The two-ounce Dewar flask
is a lovely little thing...

Gerhard Hoffmann
Guest

Fri Dec 28, 2018 12:45 pm   



Am 28.12.18 um 03:19 schrieb bill.sloman_at_ieee.org:
Quote:
On Friday, December 28, 2018 at 6:42:24 AM UTC+11, John Larkin wrote:
On Thu, 27 Dec 2018 22:45:30 +1100, Sylvia Else <sylvia_at_email.invalid
wrote:

https://au.rs-online.com/web/p/crystal-oscillators/1485663/

$142.20

Is this the crystal oscillator equivalent of those absurdly expensive
speaker cables?

That's worth maybe $7. We buy one Fox TCVCXO for about $2.25 in modest
quantity.

You can get a seriously good OCXO for around $70 these days.

A crystal oscillator in an oven runs hot (or always used to - a Peltier junction could let you stabilise it's temperature close to room temperature).

This means that it eats power, and ages fast.


A oven eats power with 100% efficiency, a Peltier is much worse.
What we want is maximum thermal impedance between the xtal and
its environment, some mass for thermal low pass filtering and the
temperature the crystal is cut for.

In the case of SC cut xtals that means abt. 70°C. And the TC is not
everything; there are also things like activity dips and mode jumping.

A Peltier has all the attributes we don't want there. It has a very
low thermal impedance between plate A and B, so there is not any
low pass filtering. It generates COLD on one side that we don't need
and at the 70°C needed for SC cut quality crystals it is already on
the verge of dying.

Hope you had a nice winter solstice.
Gerhard.

Some people from the HP corner claim that SC does not stand for
stress compensated but for Santa Clara Smile

Lasse Langwadt Christense
Guest

Fri Dec 28, 2018 1:45 pm   



fredag den 28. december 2018 kl. 11.24.56 UTC+1 skrev whit3rd:
Quote:
On Friday, December 28, 2018 at 12:21:32 AM UTC-8, upsid...@downunder.com wrote:
On Thu, 27 Dec 2018 18:19:39 -0800 (PST), bill.sloman_at_ieee.org wrote:


You can get a seriously good OCXO for around $70 these days.

This means that it eats power, and ages fast.

The power consumption is an issue, if mains power is not always
available and you have to use batteries to maintain temperature. I
once used an oscillator in a thermos bottle to minimize oven heat
losses.

I've seen 'em in cans with fiberglass insulation, and in small thermos bottles,
as well as what looks like hermetic sealed cases. The two-ounce Dewar flask
is a lovely little thing...


https://youtu.be/kypSsA6EZzc

Goto page 1, 2, 3, 4, 5, 6, 7  Next

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