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Author Topic: Req :1 Hz square wave generator  (Read 2665 times)
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samir
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« on: June 05, 2008, 08:01:06 08:01 »

Hi friends
Any one know how to generate 1Hz Square wane,has to be stable, accurate against time and temperature Drift using crystal.

Thanx in Advance
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wessoms
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« Reply #1 on: June 05, 2008, 09:40:25 09:40 »

Need a little more information.

What do you mean by stable?  Accurate to .00000000001hz / year etc.
Do you care what the base crystal is? Generally you start with a hi freq / low ppm < 20 then divide down.
Drive strength of the output?
Edge slew rate ?
What temp range ? -45C to 105C , etc....

Fill in as much information and you will get some great hepl. This board is viewed by a lot of smart people but we need more information to help.


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zuisti
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« Reply #2 on: June 05, 2008, 09:53:34 09:53 »

...how to generate 1Hz Square wane,has to be stable, accurate against time and temperature Drift using crystal

Use a simple and cheap analog quartz clock. Its 'power' outputs (for the coil) are usable as a high accurate 2 hz pulse generator. After a level interfacing (if needed), use a simple divide by two circuit (a flip-flop) to get a simmetrical 1 hz pulse.
If you needed a much more accurate signal, use a little 'thermostat' for the clock's PCB to eliminate the temperature drift.
The long time drift is an other problem, my idea: use an old (long-used) clock device.
An idea only...
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flash65
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« Reply #3 on: June 05, 2008, 10:09:21 10:09 »

if you want high accuracy and precison. you need a gps disciplined clock. this is some link:
http://www.g7ltt.com/10mhz/
http://www.qsl.net/zl1bpu/MICRO/GPSCLOCK/
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Sun_rise_pt
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« Reply #4 on: June 05, 2008, 10:37:41 10:37 »

Try with  a  electronic circuit of cheap chinese clock. I think if you make stable the quartz temperature the precision are aceptable. You get the square wave on  output for motor coil.
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jzaghal
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« Reply #5 on: June 05, 2008, 01:58:01 13:58 »

Hi,

You can use a CD4060 with a 32Khz crystal to get a ccurate 2HZ, then just use a FF to divide by 2.

Final result depends  on Xtal.

Bye.
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