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Extras Non Exam     Oscillator     555 Short Pulse     >Crystal<     NOT Gate     Sine Wave    

Oscillator Crystal


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Circuits that need accurate timing require a very accurate oscillator.

The circuit below is based on a CMOS 4000 series NOT gate. The UB in the part number indicates "unbuffered". To get pulses once per second, several divide by 16 counter chips can be used. 

32kHz Oscillator

Quartz Crystal Oscillator

If less accuracy is needed, the trimmer and 3.3 pF capacitor can be replaced with a fixed 15 pF capacitor .

 

 

 

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