Feedback voltage regulators operate by comparing the actual output voltage to some fixed reference voltage.
2.
A feedback voltage amplifier using an op amp with finite gain but infinite input impedances and zero output impedance.
3.
Capacitors C1 and C2 form a voltage divider that determines the amount of feedback voltage applied to the transistor input.
4.
This causes the feedback voltage to be variable as well, sometimes making the Colpitts circuit less likely to achieve oscillation over a portion of the desired frequency range.
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