How to make, where to buy, order 5 kHz, 10 kHz, 15 kHz crystal/ ceramic resonators

[la-la]

Hi,

how to make a crystal /ceramic oscilator for a specicfied frequency in
kHz range ?
Is it posssible to make one on myself, or find someone to make it ?
What is a minimum order quantity for a crystal/c eramic resonator for a
specified frequency (kHz) ?
Please help me.

 

[Meat Plow]

Hi,

how to make a crystal /ceramic oscilator for a specicfied frequency in
kHz range ?
Is it posssible to make one on myself, or find someone to make it ?
What is a minimum order quantity for a crystal/c eramic resonator for a
specified frequency (kHz) ?
Please help me.

http://www.qth.com/inrad/

 

[Rich Grise]

Hi,

how to make a crystal /ceramic oscilator for a specicfied frequency in
kHz range ?
Is it posssible to make one on myself, or find someone to make it ?
What is a minimum order quantity for a crystal/c eramic resonator for a
specified frequency (kHz) ?
Please help me.

Try a CD4060 - http://www.fairchildsemi.com/ds/CD/CD4060BC.pdf

Then you can use a sane crystal freq. ;-)

Or, you could look into "tuning fork crystals", which is the type of the
32.768KHz crystal in your wristwatch.

Good Luck!
Rich

 

[Don Lancaster]

Hi,

how to make a crystal /ceramic oscilator for a specicfied frequency in
kHz range ?
Is it posssible to make one on myself, or find someone to make it ?
What is a minimum order quantity for a crystal/c eramic resonator for a
specified frequency (kHz) ?
Please help me.

We have many tens of thousands of crystal oscillator modules in stock at
fifty cents each.

Our lowest frequencies are 28.8 kHz, 108 kHz, 153.6 kHz, 250 kHz, 256
kHz, 307.2 kHz, 326.4 kHz plus hundreds of higher frequencies.

In general, it is usually cheaper and simpler to use a higher frequency
and a CMOS binary divider.

Also in general, if your system does not use a crystal frequency of
32.768 kHz or 3.59545 MHz, you should flush it and start over.



--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email: [email protected]

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

[Don Lancaster]

We have many tens of thousands of crystal oscillator modules in stock at
fifty cents each.

Our lowest frequencies are 28.8 kHz, 108 kHz, 153.6 kHz, 250 kHz, 256
kHz, 307.2 kHz, 326.4 kHz plus hundreds of higher frequencies.

In general, it is usually cheaper and simpler to use a higher frequency
and a CMOS binary divider.

Also in general, if your system does not use a crystal frequency of
32.768 kHz or 3.59545 MHz, you should flush it and start over.

Oops.

Should be 3.579545 of course.


--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email: [email protected]

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

[Jan Panteltje]

Also in general, if your system does not use a crystal frequency of
32.768 kHz or 3.59545 MHz, you should flush it and start over.

Poor guy ;-)

 

[Robert]

Oops.

Should be 3.579545 of course.

32.768 kHz is 2^15 Hz

Where does 3.579545 MHz come from?

 

[Rich Grise]

32.768 kHz is 2^15 Hz

Where does 3.579545 MHz come from?

TV color burst.

Cheers!
Rich

 

[Michael A. Terrell]

32.768 kHz is 2^15 Hz

Where does 3.579545 MHz come from?

NTSC color burst.


--
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

 

[Michael A. Terrell]

We have many tens of thousands of crystal oscillator modules in stock at
fifty cents each.

Our lowest frequencies are 28.8 kHz, 108 kHz, 153.6 kHz, 250 kHz, 256
kHz, 307.2 kHz, 326.4 kHz plus hundreds of higher frequencies.

In general, it is usually cheaper and simpler to use a higher frequency
and a CMOS binary divider.

Also in general, if your system does not use a crystal frequency of
32.768 kHz or 3.59545 MHz, you should flush it and start over.

So, if I need a 4 MHz clock for a CPU, I should scrap it and make it a
lot more complex to use a color burst crystal? How about those 10- MHz
frequency standards? Show me a SIMPLE design for a TCXO to proved a low
distortion 10 MHz signal from a 3.5795454545 crystal. Yes, i know that
it can be done, but why? There are dozens of common, off the shelf
crystal frequencies that are dirt cheap.



--
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

 

[Hal Murray]

32.768 kHz is 2^15 Hz

Where does 3.579545 MHz come from?

TV color burst.

 

[[email protected]]

how to make a crystal /ceramic oscilator for a specified frequency in
kHz range ?

The speed of sound in quartz is (depending on shear vs. compression
wave)
400 to 600 m/second; so a quartz slab resonant at 3.579 MHz is a tenth
of
a millimeter thick. Those (AT cut typically) are mass-produced for
television
sets, and are inexpensive and available off the shelf.

At 15 kHz, an AT quartz resonator would need to be (in size) about 200
times that,
2 cm thick (and broader than it is thick, so it'd be a Frisbee-sized
disk). They don't
make those, as far as I know. Normal mortals couldn't afford one.

For wristwatches, a tuning-fork is used, and one can micromachine it
from quartz
and laser-trim its weighted tines for frequency and couple to it using
the quartz
material's piezoelectric properties. Those are mechanical oscillators
with
non-quartz parts, but they still get called 'quartz resonators'. The
common
frequencies are mass-produced, and that means 32.000 kHz and 32.768
are available, but not the lower frequencies you ask about.

The typical resonators used for 5 kHz are tuning forks and guitar
strings, or they
aren't mechanical at all...

 

[Charlie Edmondson]

32.768 kHz is 2^15 Hz

Where does 3.579545 MHz come from?

Color burst frequence in NTSC signals...

Charlie

 

[Tom Bruhns]

32.768 kHz is 2^15 Hz

Where does 3.579545 MHz come from?

The colour subcarrier of NTSC-encoded colour television broadcasts.
The crystals, being very common at least in the USA, are cheap. FWIW,
the NTSC colour subcarrier is nominally at 63/176 times 10MHz (with a
tolerance of +/-10Hz; usually kept much closer to the nominal than the
tolerance would allow), the horizontal scan frequency is 2/455 times
the colour subcarrier frequency, and the vertical scan frequency is
2/525 times the horizontal scan frequency. Expect that the scan
frequency ratios to the colour subcarrier will be exact at least in any
broadcast signal, to get proper interlace.

There are other "inexpensive" crystal frequencies. Low kHz
frequencies, of course, are not among them, but accurate generation of
low kHz frequencies is possible through division from higher crystal
frequencies.

Cheers,
Tom

 

[Joel Kolstad]

Also in general, if your system does not use a crystal frequency of 32.768
kHz or 3.59545 MHz, you should flush it and start over.

Not all of us are trying to build TV Typewriters for $5 or less, Don.

But if you can find me some way to get VHF and low UHF signals down to a 45MHz
IF with 32kHz and colorburst crystals, I'd love to hear it!

 

[Joel Kolstad]

Where does 3.579545 MHz come from?

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

 

[Joel Kolstad]

Where does 3.579545 MHz come from?

More information on exactly why 3.579545MHz was chosen:
http://en.wikipedia.org/wiki/NTSC (see the "color encoding" section)

 

[[email protected]]

At 15 kHz, an AT quartz resonator would need to be (in size) about 200
times that,
2 cm thick (and broader than it is thick, so it'd be a Frisbee-sized
disk). They don't
make those, as far as I know. Normal mortals couldn't afford one.

This guy came close , quartz ring, not a frisbee, but close :

http://www.btinternet.com/~time.lord/QuartzRings.html

Steve Roberts

 

[Rich Grise]

So, if I need a 4 MHz clock for a CPU, I should scrap it and make it a
lot more complex to use a color burst crystal? How about those 10- MHz
frequency standards? Show me a SIMPLE design for a TCXO to proved a low
distortion 10 MHz signal from a 3.5795454545 crystal. Yes, i know that
it can be done, but why? There are dozens of common, off the shelf
crystal frequencies that are dirt cheap.

But color burst crystals are free, if the neighbor tosses their TV. ;-)

Cheers!
Rich

 

[Rich Grise]

More information on exactly why 3.579545MHz was chosen:
http://en.wikipedia.org/wiki/NTSC (see the "color encoding" section)

Ah, HA! At last!
"The remaining vertical blanking interval lines are typically used for
datacasting or ancillary data such as video editing timestamps (vertical
interval timecodes or SMPTE timecodes on lines 12-14 [3] [4]), test data
on lines 17-18, a network source code on line 20 and closed captioning,
XDS and V-chip data on line 21. Early teletext applications also used
vertical blanking interval lines 14-18 and 20, but teletext over NTSC was
never widely adopted by viewers [5]."

Anyone for a commercial skipper? I think I might hack into my TeeVee, and
sync up line 20 and see if there's any predictable change when they go
to commercial. "Network source code"? Sounds fascinating!

I wonder where I'd look up the coding protocol?

Cheers!
Rich