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Square wave clock circuit

2017-01-07 12:42  
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Square wave clock circuit
Square wave clock: The HA-4900/4905 high precision comparator integrated circuit which is produced by the Harris company has four comparators, you can form the fixed frequency square wave generator with good frequency stability by using only one comparator, the output can be used as the clock signal. The frequency is decided by the R1 and C1, R2 supplies the regeneration feedback. When the frequency is 100kHz, in order to improve the frequency precision, we can change C1 into the crystal. The oscillation frequency of this circuit f=1/2.1R1C1.