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Need a circuit for generate stable clock

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stephen-7486

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generating a clock

i need a curcuit to run a clock that is stable and dosent wander off
frequency. i have tried 555's and had no luck
can anyone help

thanks steve
 

generating a clock

How stable is "stable"? 1% or 1ppm/C for example?

Keith.
 

stable is within 0.01% to 0.1% preferably closer to 0.01%
so extreamly stable

steve
 

Well, a crystal then. What frequency? What voltage output? 5V or 3V for example. I presume you want a square wave?

Keith.
 

i need a square wave at 5V at 2.4kHz

steve
 

Axmmm, microcontroller with hardware PWM module, quartz crystal in oscillator (nor ceramic resonator), duty cycle 50% ?

In Proton+ it should be something like:
Code: 
Device 16F627
Xtal 4
PortB_Pullups FALSE
All_Digital TRUE

HPWM 1, 127, 2400

End
 

I agree a cheap microcontroller is probably the way to go. There are programmable clock generators around but they are mostly very high frequency, that I know of. While you could do it with a crystal or clock & counter (maybe 74HC4040) you will end up with a wierd crystal being required.

The PIC microcontroller is one option, but there are many micros which could do the job.

Keith.
 

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