(1) One type of crystal-controlled oscillator that uses the crystal's series
resonant feature for frequency determination is shown in A of figure 2-9.
For variety a PNP transistor is shown, so biases are negative.
shunt-fed crystal-controlled oscillator is basically a tickler-coil type.
Regenerative feedback is obtained by transformer action.
tank is tuned to the series resonant frequency of the crystal.
of the signal generated.
(2) Another crystal-controlled oscillator is shown in B of figure 2-8.
should recognize it as a Colpitts type.
resonate with C1 and C2 is provided by the crystal.
(3) These are but two of a wide variety of ways to use crystals for frequency
control of oscillators.
The main advantage of crystals is their