Best IC for Anti-Lost Alarm Receiver to Pair With NE555 Transmitter?

The discussion centers on selecting an appropriate integrated circuit (IC) for the receiver in an anti-lost alarm system designed to track pets or children. The transmitter uses an NE555 timer IC to generate oscillations, but the receiver IC choice is uncertain. Responses highlight that the NE555 may lack frequency stability and accuracy, potentially causing receiver issues such as false triggers. Alternatives suggested include using a dual 121 IC like the L4LS221, ceramic resonators combined with operational amplifiers for improved frequency stability, or employing SAW (Surface Acoustic Wave) filters commonly used in RF remote controls and automotive electronics for precise signal filtering. Additional recommendations include simple Hartley oscillators, CMOS logic oscillators using ICs like the 4069, and RF modules such as Rx-2B and Tx-2B used in small radio-controlled devices. Links to application notes and datasheets from Freescale and Epcos provide further technical guidance on SAW components and resonators. The overall advice cautions beginners about the complexity and reliability requirements of such projects involving safety-critical applications.
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