Xtal/chip combo for 60 Hz ?

Guest
Is there a commonly available crystal and divider chip combination to
generate 60 Hz?
 
<sagobog-no-spam@cotse.net> wrote in message
news:c2Fnb2JvZw==.0c71848ceec5f0e37649ed5324dfb857@1084566036.nulluser.com...
Is there a commonly available crystal and divider chip combination to
generate 60 Hz?

Yes, but it's so much simpler and cheaper to use the line freq., if it's
Click to expand...
60 Hz in your area. Long-term more stable, too. Remember electric clocks?
They used to use the line freq - they actually had a little synchronous
motor.

Otherwise, find a crystal that's on a 2^n multiple of 60 Hz, and divide
it down with a 4060.

Cheers!
Rich
 
On Fri, 14 May 2004 21:39:36 GMT, "Rich Grise" <null@example.net>
wrote:

sagobog-no-spam@cotse.net> wrote in message
news:c2Fnb2JvZw==.0c71848ceec5f0e37649ed5324dfb857@1084566036.nulluser.com...
Is there a commonly available crystal and divider chip combination to
generate 60 Hz?

Yes, but it's so much simpler and cheaper to use the line freq., if it's
60 Hz in your area. Long-term more stable, too.
Click to expand...
---
Unfortunately, short-term it sometimes goes to zero Hz.
---

Remember electric clocks?
They used to use the line freq - they actually had a little synchronous
motor.

Otherwise, find a crystal that's on a 2^n multiple of 60 Hz, and divide
it down with a 4060.
Click to expand...

4060 ÷ f XTAL COMMONLY AVAILABLE?
OUTPUT N Hz DIGI-KEY
--------+------+-------+--------------------
Q3 8 480 NO
Q4 16 960 NO
Q5 32 1920 NO
Q6 64 3840 NO
Q7 128 7680 NO
Q8 256 15360 NO
Q9 512 30720 NO
Q11 2048 122880 NO
Q12 4096 345760 NO
Q13 8192 691520 NO

--
John Fields
 
novatech@eskimo.com (Steven Swift) writes:

from the line or using a binary crystal such as 4.194304MHz with a
CD4060, but very nice if you want to generate a perfect 60Hz.
Click to expand...
Whoops, that was to get 1Hz, need a multiple of 60.

But the RM works.

Steve.
--
Steven D. Swift, novatech@eskimo.com, http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC. P.O. Box 55997
206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA
 
Subject: Xtal/chip combo for 60 Hz ?
From: sagobog-no-spam@cotse.net
Date: 5/14/2004 3:20 PM Central Standard Time
Message-id:
c2Fnb2JvZw==.0c71848ceec5f0e37649ed5324dfb857@1084566036.nulluser.com

Is there a commonly available crystal and divider chip combination to
generate 60 Hz?
Click to expand...
Of course, the customary solution for this is to use the 60 Hz line frequency
to do this. Otherwise, the customary answer is to generate an interrupt off of
your microcontroller timer/counter using the crystal-based uC clock frequency.
But somehow, I don't think that's what you're looking for.

Given that, I don't think there's a one-chip solution that will get you where
you want to go. An older UART crystal frequency of 1.2288 MHz will get you a
two-chip solution (view in fixed font or M$ Notepad):

60 Hz From Crystal or Oscillator
.-----------------.
| | .--------------.
..-----o-----. | | | |
| | | CLK /2^11| | |
| 1.2288MHz o----o CD4040 o------oCLK |
| | | | | CD4017 |
| | | | | |
'-----o-----' | | .-oEN |
| | | | |
| | | | OUT/10 |
| | | '-------o------'
'-----------------' | |
=== |
GND |
|
|
o
60 Hz
Squarewave

A cursory scan doesn't show any crystals at this frequency from the usual
hobbyist suspects, but you can get a full-size TTL/CMOS-compatible clock
oscillator at this frequency from Mouser for $1.50 USD from Mouser (P/N
520-TCF122). Have fun.

Good luck
Chris
 
<sagobog-no-spam@cotse.net> wrote
Is there a commonly available crystal and divider chip combination to
generate 60 Hz?
Click to expand...
You don't mention how accurate of a source that you need. A PIC, some
simple code and virtually any crystal could do it quite well.
 
<sagobog-no-spam@cotse.net> wrote in message
news:c2Fnb2JvZw==.0c71848ceec5f0e37649ed5324dfb857@1084566036.nulluser.com...
Is there a commonly available crystal and divider chip combination to
generate 60 Hz?
Click to expand...
You don't mention how accurate of a source that you need. A PIC, some
simple code and virtually any crystal could do it quite well.
 
On Fri, 14 May 2004 16:20:36 -0400 (EDT), <sagobog-no-spam@cotse.net> wrote:

Is there a commonly available crystal and divider chip combination to
generate 60 Hz?
Click to expand...
There USED_TO_BE a standard Fairchild chip -a 5369 (forget the prefix, and the
suffix brings up different output freqs) that went from a colour burst crystal
freq to line freq. Oscillator on chip.

Here in .au, where the line is 50Hz and the colour burst xtal is 3.579545 and a
bit, the -EYRN suffix chip was the deal.
 
"John Fields" <jfields@austininstruments.com> wrote in message
news:9ghaa0ta7qut3qupd42ku4sjnhtfpdt5ra@4ax.com...
On Fri, 14 May 2004 21:39:36 GMT, "Rich Grise" <null@example.net
Otherwise, find a crystal that's on a 2^n multiple of 60 Hz, and divide
it down with a 4060.
4060 ÷ f XTAL COMMONLY AVAILABLE?
OUTPUT N Hz DIGI-KEY
Q13 8192 691520 NO
Click to expand...
OK, a 6.000000MHz crystal (digi-key CTS CTX605-ND
http://dkc3.digikey.com/PDF/T042/0685.pdf )
and 2.5x 74HC390
http://www.semiconductors.philips.com/acrobat/datasheets/74HC_HCT390_CNV_2.pdf

Better?

Cheers!
Rich
 
And a 74HCU04 for the oscillator.
:)

"Rich Grise" <null@example.net> wrote in message
news:Zdwpc.202855$L31.170457@nwrddc01.gnilink.net...
"John Fields" <jfields@austininstruments.com> wrote in message
news:9ghaa0ta7qut3qupd42ku4sjnhtfpdt5ra@4ax.com...
On Fri, 14 May 2004 21:39:36 GMT, "Rich Grise" <null@example.net
Otherwise, find a crystal that's on a 2^n multiple of 60 Hz, and divide
it down with a 4060.
4060 ÷ f XTAL COMMONLY AVAILABLE?
OUTPUT N Hz DIGI-KEY
Q13 8192 691520 NO

OK, a 6.000000MHz crystal (digi-key CTS CTX605-ND
http://dkc3.digikey.com/PDF/T042/0685.pdf )
and 2.5x 74HC390

http://www.semiconductors.philips.com/acrobat/datasheets/74HC_HCT390_CNV_2.pdf

Better?

Cheers!
Rich
Click to expand...
 
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