Crystal-controlled signal source

This general purpose signal source serves very well in signal-tracing applications. The output level is variable to more than 1 Vrms into a 50 O load. Almost any crystal in the 1 to 15 MHz range can be used. Ql forms a Colpitis oscillator with the output taken from the emitter. A capacitive voltage divider (across the 2.2 emitter resistor) reduces the voltage applied to the buffer amplifier, Q2.
Crystal-controlled signal source - schematic

The buffer and emitter follower, provides the low input impedance necessary to drive 50 O loads.


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