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Metal Detector Circuit Ultrasonic Sound Frequency In Crushers

The circuit described here is that of a metal detector. The opera- tion of the circuit is based on superheterodyning principle which is commonly used in superhet receivers. The circuit utilises two RF oscillators. The frequencies of both oscillators are fixed at 5.5 MHz. The first RF oscillator comprises transistor T1 BF 494 and a 5.5MHz .

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