Discussion
Which oscillator would you choose for a microcontroller's clock?
Answer: D
A Pierce gives crystal accuracy from two capacitors and an inverter, which is why it is built into essentially every microcontroller. A Wien bridge is an audio sine generator, a varactor-tuned Colpitts is for tunable radio work, and a unijunction is a low-accuracy trigger circuit. Matching a topology to an application means naming the specification that matters, and for a digital clock it is accuracy at negligible cost.
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