How to build a Crystal-controlled-reflection-oscillator circuit diagram
. This is a simple crystal controlled reflection oscillator circuit,
this unit is easily tunable and stable, consumes little power, and costs
less than other types of oscillators tlmt operate at the same
frequencies. This unusual combination of features is made possible by a
design concept that includes operation of the transistor well beyond the
3 dB frequency of its current-versus- frequency curve.
Crystal Controlled Reflection Oscillator Circuit Diagram
The concept takes advantage of newly available crystals that resonate at
frequencies up to about 1 GHz.The emitter of transistor Q is connected
with variable capacitor Cl and series-resonant crystal X. The emitter is
also connected to ground through bias resistor Rl. The base is
connected to the parallel combination of inductor L and capacitor C3
through DE-blocking capacitor and C4 and is forward biased with respect
to the emitter by resistors R3 and R4.
Impedance Z could be the 220-0 resistor shown or any small impedance
that enables the extraction of the output signal through coupling
capacitor C2. If Z is a tuned circuit, it is tuned to the frequency of
the crystal.
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