70MHz crystal oscillator-----70MHZ crystal oscillator
Source: InternetPublisher:qoistoochee128 Keywords: Oscillator Circuit Updated: 2024/07/23
As shown in the figure, this is a 70MHz crystal oscillator circuit. It consists of a crystal oscillator, a buffer amplifier, a frequency-selective amplifier, etc. Its main function is to output a 70MHz baseband frequency signal after the weak signal output by the crystal oscillator passes through the amplifier circuit and then undergoes frequency-selective amplification.
Component selection:
Transistor VTl: 3DG5F, β≥100; VT2, VT3: G711D or 3DG5F, β=60～80; Quartz crystal SJT:
JA-72A-70MHz; color code inductors L4, L5: LX-3A-5.6μH. Other component parameter values are marked as shown in the figure.
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