Req :1 Hz square wave generator

[samir]

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

[wessoms]

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.

[zuisti]

...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...

[flash65]

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/

[Sun_rise_pt]

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.

[jzaghal]

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.