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32768Hz crystal oscillator circuit

2016-08-21 01:22  
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32768Hz crystal oscillator circuit
It consists of an integrated circuit CD4060, a crystal with resonant frequency of 30720Hz and other components. CD4060 is a 14-bit binary serial counter, divider and oscillator. This circuit uses an external 30720Hz crystal to form a crystal oscillator. The oscillation signal is frequency processed through the inner parts of CD4060 and is to output accurate 60Hz frequency signal at the end of Q9 (30720 ÷ 29 = 60Hz). When the circuit is equipped with the double negative digital clock, 2b circuit shown in figure 2 can be used for polarity transform. VT1 and VT2 both use NPN type transistor, such as 9013 and 8050 and so on. Terminal A in the figure is equipped with positive power supply and Terminal B is equipped with negative power supply.