Cheap 40KHz clock

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Use a 40KHz Xtal and a 74C14 schmitt trigger:

                 ________  <---------------- 2.2 M resistor 
             ___|  2M2   |___ 
             |  |________|   | 
             |               | 
             |               | 
             |     |\        | 
             |     | \       | 
             +-----|  O------+--------> Output 40KHz 
             |     | / 
             |     |/  gate 1 of 74C14 
             | 
             | 
           --+-- 
            XXX   40KHz Xtal 
           --+-- 
             | 
             | 
           ----- 
            --- 
             - 

This circuit has worked for me in many applications. (it might be an idea to buffer the signal befor using it. (There are still 5 unused gates in the ‘C14.. :-)

Sources

  • Sebastian Filzek

Category:Oscillators

 

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