Personal-pocket-pager

  
When activated, the transmitter sends out a 49.890-MHz, AM rf carrier. The.receiver detects, amplifies, and decodes the rf signal, which, in turn, activates a piezo buzzer. The receiver is small enough to carry in a pocket or sit on your workbench.
Personal-pocket-pager - schematic

The transmitter is also small and fits easily into a pocket for quick access.




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