100Khz Crystal Calibrator
The described crystal calibrator operates on a 12-V power supply and is designed to enhance the functionality of shortwave receivers. The circuit utilizes two transistors, Q1 and Q2, which are configured to form a Colpitts oscillator. This type of oscillator is characterized by its ability to generate a stable frequency output, which is essential for tuning and calibration purposes in SW receivers.
In the oscillator configuration, Q1 and Q2 work in tandem to produce an oscillating signal. The frequency of oscillation is determined by the values of the capacitors and inductors in the circuit, specifically designed to match the desired frequency range for shortwave applications. The output from this oscillator is typically a sine wave or a square wave, depending on the specific design and components used.
Q3 serves as a buffer amplifier, isolating the oscillator from the load and ensuring that the signal is strong enough to drive subsequent stages of the SW receiver without distortion. This buffering action prevents loading effects that could otherwise alter the frequency or amplitude of the oscillating signal, maintaining the integrity of the calibration process.
The overall design emphasizes stability and precision, making it a valuable tool for radio enthusiasts and professionals who require accurate frequency calibration in their shortwave receivers. Proper selection of components, such as the crystal used for frequency stabilization and the values of passive components, is crucial for achieving optimal performance. Using a 12-V supply, this crystal calibrator should prove a useful accessory for a SW receiver. Ql and Q2 form a n oscillator and Q3 is a buffer amp.
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