Pierce Crystal Oscillator Circuit
01 Pierce oscillator circuit
Today, in a wireless transmission book, I saw a Pierce crystal oscillator circuit. This is a circuit that uses a crystal to form an equivalent inductor and a peripheral capacitor to form a parallel resonance. ·There have been relatively few experiments with this circuit before. Let’s use BC547 to build this circuit for testing.
▲ 图1.1 测试电路
1. Build the circuit
Pick a BC547 transistor. Build the oscillator circuit on a breadboard. The circuit is relatively simple. It will be built soon. The potentiometer is used to adjust the working bias voltage of the transistor. The crystal is selected to be 2.4576MHz, and the working power supply is selected to be 12V. Double-check the test circuit before experimenting. Double check.
After powering up, use an oscilloscope to measure the transistor collector voltage waveform. Adjusting the bias voltage can affect the amplitude of the oscillation waveform. The oscillation waveform is somewhat distorted. The frequency is approximately 2.453MHz, which is the same as the nominal crystal frequency. It seems that this oscillation circuit is very easy to start oscillation. This is the first time I measured the operating waveform of this circuit. Use a frequency meter to read the frequency of the oscillating signal. Timing at the access frequency will affect the amplitude of the oscillation waveform.
※ Summary ※
This article tested a crystal oscillator circuit and used a breadboard to verify the working status of this circuit. It uses the inductance working range of the crystal to form a capacitive three-point oscillation circuit.
