Posted on Aug 9, 2012

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.

Click here to download the full size of the above Circuit.

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

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