Crystal Controlled Oscillator Circuit
This general purpose signal source serves very well in signal-tracing applications. The output level is variable to more than 1 Vrms into a 50Ω load. Almost any crystal in the 1 to 15 MHz range can be used.
CRYSTAL (1 to 15 MHz)
Q1 forms a Colpitts oscillator with the output taken from the emitter.
2N2222 Pin Configuration
A capacitive voltage divider (across the 2.2k Ω emitter resistor) reduces the voltage applied to the buffer amplifiers Q2. The buffer and emitter follower, provides the low input impedance necessary to drive 50Ω loads.