Acousto-optic detector circuit to measure the crystal

The circuit consists of a capacitance three-point oscillator, an isolation level, a voltage doubler rectifier circuit, a stereo sound circuit, and a flash display circuit. It can detect the quality of a crystal; a good crystal will emit a "Didi" sound, and LED1 and LED2 will blink, while a bad crystal will not produce any sound.

The described circuit is a multifaceted electronic device designed to evaluate the quality of crystals by utilizing several integrated components. The capacitance three-point oscillator serves as the core of the circuit, generating oscillations that are sensitive to the capacitance of the crystal under test. This oscillator's output is crucial for determining the operational characteristics of the crystal.

An isolation level is incorporated to prevent interference from external signals and to ensure that the measurements taken are accurate. This isolation is vital for maintaining the integrity of the oscillator's output, allowing for precise readings of the crystal's performance.

The voltage doubler rectifier circuit is employed to convert the alternating current (AC) signals generated by the oscillator into direct current (DC). This conversion is necessary for powering the subsequent components, particularly the stereo sound circuit, which is responsible for generating the audible "Didi" sound when a good crystal is detected. The sound output provides immediate feedback to the user regarding the crystal's condition.

In conjunction with the sound output, the flash display circuit utilizes LED indicators (LED1 and LED2) to provide a visual indication of the crystal's quality. When a good crystal is detected, both LEDs will blink, providing a dual mode of feedback—auditory and visual. Conversely, if a bad crystal is identified, there will be no sound or LED activity, indicating a failure in the crystal's performance.

Overall, this circuit is a compact and efficient tool for crystal quality testing, utilizing a combination of oscillation, rectification, sound generation, and visual indication to convey the results of the evaluation effectively.The circuit is shown in Figure, which consists of capacitance three-point oscillator, isolation level, voltage doubler rectifier circuit and stereo sound circuit and flash display circuit. It can detect the crystal`s goodness or badness, good crystal will issue the sound of Didi, and LED1, LED2 will be blinking; bad crystal will not issue audible and..

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