Crystal Controlled Oscillator Circuit


Crystal Controlled Oscillator Circuit

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 Controlled Oscillator Circuit

PARTS LIST

R1
10kΩ

R2
10kΩ

R3
10kΩ

R4
10kΩ

R5
2.2kΩ

R6
470Ω

R7
33Ω

R8
500Ω Preset

C1
0.001µF (102)

C2
100pF

C3
0.001µF (102)

C4
0.01µF (103)

C5
0.01µF (103)

C6
0.01µF (103)

Q1
2N2222

Q2
2N2222

XTAL1
CRYSTAL (1 to 15 MHz)

Q1 forms a Colpitts oscillator with the output taken from the emitter.

2N2222 NPN switching transistor

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.

Crystal Controlled Colpitts Oscillator Circuit
Crystal Signal Source Frequency Measuring
Crystal Controlled Oscillator Circuit


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