21.twenty(a) is mostly called the Pierce crystal. The resulting circuit frequency of oscillations is ready with the series resonant frequency with the crystal. Variants in provide voltage, transistor parameters, and so forth. don't have any impact on the circuit operating frequency which is held stabilized via the crystal. The circuit https://consumerelectronicscrysta15826.bloggadores.com/34130167/not-known-factual-statements-about-consumer-electronics-crystal-oscillators