21.twenty(a) is generally called the Pierce crystal. The ensuing circuit frequency of oscillations is ready from the series resonant frequency of the crystal. Variations in supply voltage, transistor parameters, and so on. don't have any effect on the circuit working frequency that's held stabilized because of the crystal. The circuit https://timingcomponentsforconsum39517.jiliblog.com/91554843/timing-components-for-consumer-electronics-can-be-fun-for-anyone