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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