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Stapm

ArchiverArchiver Posts: 46,084
edited 2004-01-05 15:32 in General Discussion
Hi group!

Does anyone have info to make a 40Khz crystal oscillator with NE555 or
with
any other simple IC, the application should still frequency stable even
under low
temperature (-20 C)

Thanks

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-12-30 05:08
    NE555 and "stable" are rarely used in the same sentence due to the RC
    components. That said, you'll find a schematic for an IR modulator in
    our original BS1 app notes.

    -- Jon Williams
    -- Parallax

    Original Message
    From: Rene Genest [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=AUcHULIQ3tbOFgosThw1LIsitT5eVsAh1kdaEIGeJDw4C0_FcWyQrkVKNPKgwBWsvANox5__dg0UASKrBAXFPQ]rene.genest@q...[/url
    Sent: Monday, December 29, 2003 5:05 AM
    To: stamp
    Subject: [noparse][[/noparse]basicstamps] Stapm


    Hi group!

    Does anyone have info to make a 40Khz crystal oscillator with NE555 or
    with any other simple IC, the application should still frequency stable
    even under low temperature (-20 C)

    Thanks


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  • ArchiverArchiver Posts: 46,084
    edited 2003-12-30 15:16
    If you want to use the NE555, please remember that even thou the
    datasheet say Vcc is 5 volt, you must power it with 7 volt, if you
    want it to perform correctly.

    I wonder how many young and smart kids quitting this fibulas hobby,
    starting with dope, just because this NE555 circuit does not have
    the correct info on the datasheet?

    I had a little Dos program that I used in the old days, when I
    needed to calculate the frequency and resistor. I could not find it
    at this moment, but I mail the program to you if I find it later
    tonight.

    Stein.

    --- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
    wrote:
    > NE555 and "stable" are rarely used in the same sentence due to the
    RC
    > components. That said, you'll find a schematic for an IR
    modulator in
    > our original BS1 app notes.
    >
    > -- Jon Williams
    > -- Parallax
    >
    >
    >
    Original Message
    > From: Rene Genest [noparse][[/noparse]mailto:rene.genest@q...]
    > Sent: Monday, December 29, 2003 5:05 AM
    > To: stamp
    > Subject: [noparse][[/noparse]basicstamps] Stapm
    >
    >
    > Hi group!
    >
    > Does anyone have info to make a 40Khz crystal oscillator with
    NE555 or
    > with any other simple IC, the application should still frequency
    stable
    > even under low temperature (-20 C)
    >
    > Thanks
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the
    Subject
    > and Body of the message will be ignored.
    >
    >
    > Yahoo! Groups Links
    >
    > To visit your group on the web, go to:
    > http://groups.yahoo.com/group/basicstamps/
    >
    > To unsubscribe from this group, send an email to:
    > basicstamps-unsubscribe@yahoogroups.com
    >
    > Your use of Yahoo! Groups is subject to:
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    >
    >
    >
    >
    > This message has been scanned by WebShield. Please report SPAM to
    > abuse@p...
  • ArchiverArchiver Posts: 46,084
    edited 2003-12-30 15:32
    As has been said "555" and "Stable over
    temperature" don't go together too well.

    Also, "Stable down to -20 C" and "Simple"
    don't go together.

    If you must have the temperature range,
    the easiest approach would be to purchase
    an oscillator module from Digikey.
    These are 8, 14, or 16 pin IC cans,
    with a built-in accurate oscillator.

    And how stable do you want it?
    +- 100 Pulses Per Million (PPM) is typical,
    +- 10 PPM is available
    +- 5 PPM is more pricey.

    0 to 70C is typical.

    -40C to +85C is the 'extended' temp range
    for these beasties. They're a little power
    hungry -- 10 to 50 mA I think.

    Note if you're using this for IR remote use,
    the IR circuits tend to be forgiving in the
    range of 35 KHZ to 42 KHZ or so. You may not
    need all this accuracy.

    --- In basicstamps@yahoogroups.com, Rene Genest <rene.genest@q...>
    wrote:
    > Hi group!
    >
    > Does anyone have info to make a 40Khz crystal oscillator with NE555
    or
    > with
    > any other simple IC, the application should still frequency stable
    even
    > under low
    > temperature (-20 C)
    >
    > Thanks
  • ArchiverArchiver Posts: 46,084
    edited 2003-12-30 21:45
    Also note that for REALLY stable systems, we used crystal-oscillators in
    little ovens that were set something above the maximum ambient with their
    own thermostat. After a few minutes to warm up, single digit PPM stability
    was obtainable.

    Mike Sokol
    www.modernrecording.com
    mikes@m...


    " One should not increase, beyond what is necessary,
    the number of entities required to explain anything"...
    -William of Occam-

    Original Message
    From: "Allan Lane" <allan.lane@h...>
    To: <basicstamps@yahoogroups.com>
    Sent: Tuesday, December 30, 2003 10:32 AM
    Subject: [noparse][[/noparse]basicstamps] Re: Stapm


    > As has been said "555" and "Stable over
    > temperature" don't go together too well.
    >
    > Also, "Stable down to -20 C" and "Simple"
    > don't go together.
    >
    > If you must have the temperature range,
    > the easiest approach would be to purchase
    > an oscillator module from Digikey.
    > These are 8, 14, or 16 pin IC cans,
    > with a built-in accurate oscillator.
    >
    > And how stable do you want it?
    > +- 100 Pulses Per Million (PPM) is typical,
    > +- 10 PPM is available
    > +- 5 PPM is more pricey.
    >
    > 0 to 70C is typical.
    >
    > -40C to +85C is the 'extended' temp range
    > for these beasties. They're a little power
    > hungry -- 10 to 50 mA I think.
    >
    > Note if you're using this for IR remote use,
    > the IR circuits tend to be forgiving in the
    > range of 35 KHZ to 42 KHZ or so. You may not
    > need all this accuracy.
    >
    > --- In basicstamps@yahoogroups.com, Rene Genest <rene.genest@q...>
    > wrote:
    > > Hi group!
    > >
    > > Does anyone have info to make a 40Khz crystal oscillator with NE555
    > or
    > > with
    > > any other simple IC, the application should still frequency stable
    > even
    > > under low
    > > temperature (-20 C)
    > >
    > > Thanks
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    >
    >
    > Yahoo! Groups Links
    >
    > To visit your group on the web, go to:
    > http://groups.yahoo.com/group/basicstamps/
    >
    > To unsubscribe from this group, send an email to:
    > basicstamps-unsubscribe@yahoogroups.com
    >
    > Your use of Yahoo! Groups is subject to:
    > http://docs.yahoo.com/info/terms/
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2004-01-05 10:45
    Hi Jim!

    Finally, I'm using the CD4060 with 40Khz crystal and it work very well even in
    sub zero temperature. The application was to supply IR signal to IR detector
    PNA4613M which is tuned at 40 Khz. But, the circuitry did not work all the
    time with every quartz crystalls, I've found two differents types of quartz
    crystalls with same frequency (32.768 Khz) but only one of them , the smallest
    size, were working fine with the CD4060 and I have no clue why! By the way,
    are they anyone have codes line or example how to use DAQ to retrive
    datas from BS2 and transfert it to EXCEL?

    Thank you very much!

    Jim Forkin a
  • ArchiverArchiver Posts: 46,084
    edited 2004-01-05 15:23
    any 3 cmos or ttl nand gates or inverting buffers will make a pretty stable
    crystal oscillator. Check any data sheet for applications.

    jim
    http://www.geocities.com/jimforkin2003/

    Original Message
    From: Jon Williams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=_ZHLcjxxe2ubN_ZkjThZWKJtPglnG18f2R5j1nYR8VGU2DxYooVNP9JMj0iuBErMU0Zv_4CA1PfPJfHA-eWN]jwilliams@p...[/url
    Sent: Tuesday, December 30, 2003 12:09 AM
    To: basicstamps@yahoogroups.com
    Subject: RE: [noparse][[/noparse]basicstamps] Stapm


    NE555 and "stable" are rarely used in the same sentence due to the RC
    components. That said, you'll find a schematic for an IR modulator in
    our original BS1 app notes.

    -- Jon Williams
    -- Parallax

    Original Message
    From: Rene Genest [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=FW4YzXHWQ762Axf1LMqhVI6I8r_v9Dry5TB26HXfZW94lQXc12KKqjXxhlh2vI26mM33pDduy621TDIC_g]rene.genest@q...[/url
    Sent: Monday, December 29, 2003 5:05 AM
    To: stamp
    Subject: [noparse][[/noparse]basicstamps] Stapm


    Hi group!

    Does anyone have info to make a 40Khz crystal oscillator with NE555 or
    with any other simple IC, the application should still frequency stable
    even under low temperature (-20 C)

    Thanks


    To UNSUBSCRIBE, just send mail to:
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  • ArchiverArchiver Posts: 46,084
    edited 2004-01-05 15:32
    One other point, a 40khz crystal is usually pretty huge and usually requires
    a fairly high drive to get it vibrating so you probably want to start with a
    higher frequency oscillator and divide down to 40 khz. This will divide
    jitter and drift as well and give you a more stable oscillator. This can
    all be done with standard logic chips. Maybe use a 4 mhz crystal to start
    and then divide by 100 for your required 40 khz. However, many applications
    do not require the stability and expense of a crystal oscillator and a
    simple 40khz 555 circuit is sufficient. Don't expect temperature stability
    with either approach without compensating circuits or an oven or both.

    jim
    http://www.geocities.com/jimforkin2003/

    Original Message
    From: Jon Williams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=iSZgvJ74baUIKrH5aYCe1p_HGMyiHKrPde1ZvN2HkvjhLym6yFI5BhFY6aXyTg_dy6MKDZ6v6SsG8cWE0q-76w]jwilliams@p...[/url
    Sent: Tuesday, December 30, 2003 12:09 AM
    To: basicstamps@yahoogroups.com
    Subject: RE: [noparse][[/noparse]basicstamps] Stapm


    NE555 and "stable" are rarely used in the same sentence due to the RC
    components. That said, you'll find a schematic for an IR modulator in
    our original BS1 app notes.

    -- Jon Williams
    -- Parallax

    Original Message
    From: Rene Genest [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=C9ZHQDClomSPiK0VRrjxAKxX1gR7NhXXeZ4pZL_mzVhBDnsb4forRR-WoWVeHbziwzQO9zijfDudVkBRA-Qf]rene.genest@q...[/url
    Sent: Monday, December 29, 2003 5:05 AM
    To: stamp
    Subject: [noparse][[/noparse]basicstamps] Stapm


    Hi group!

    Does anyone have info to make a 40Khz crystal oscillator with NE555 or
    with any other simple IC, the application should still frequency stable
    even under low temperature (-20 C)

    Thanks


    To UNSUBSCRIBE, just send mail to:
    basicstamps-unsubscribe@yahoogroups.com
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    and Body of the message will be ignored.


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