The circuit principle of an LC oscillator is known to suffer from significant frequency drift, which can be a major issue in applications requiring stability. To address this, the introduction of a sound-sounding device has proven effective. This device offers frequency stability comparable to that of a crystal oscillator and can operate at fundamental frequencies up to several hundred megahertz or even gigahertz, eliminating the need for frequency multiplication. As a result, the circuit design becomes much simpler compared to traditional crystal-based systems. Common transmitter circuits often utilize this sound-sounding device, ensuring stable operation. Even when the antenna is touched or other parts of the circuit are disturbed, the transmission frequency remains steady. These circuits can achieve a range of over 200 meters, making them suitable for various wireless communication applications. On the receiving end, options include either a super-regenerative or super-heterodyne circuit. Super-regenerative receivers are cost-effective and consume as little as 100uA, offering good sensitivity when properly adjusted. However, they tend to have lower operational stability and selectivity, which can reduce their ability to reject interference. In contrast, super-heterodyne receivers offer better performance but at a higher cost and complexity. Overall, the use of a sound-sounding device provides a practical and efficient solution for achieving stable and reliable wireless communication in many applications.
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