Rabu, Jun 26, 2013

Watch Crystal Oscillator



Free Example Electronic Circuit Design 
32.768 KHz Oscillator Circuit Diagram


Below are a couple circuits you can use to produce a 32.768 KHz square wave from a common watch crystal. The output can be fed to a 15 stage binary counter to obtain a 1 second square wave. The circuit on the left using the 4069 inverter is recommended over the transistor circuit and produces a better waveform. The single transistor circuit produces more of a ramping waveform but the output swings the full supply voltage range so it will easily drive the input to a CMOS binary counter.

Tiada ulasan:

Catat Ulasan