Carrier-Current Baby-Alert Transmitter Circuit

Posted on Sep 22, 2012

The baby-alert transmitter is built around an LM324 quad op amp (Ul), two LMC555CM CMOS oscillator/timers (U2 and U3), and a few support components. The transmitter sends a signal on receipt of a sound at MIC1.

Carrier-Current Baby-Alert Transmitter Circuit
Click here to download the full size of the above Circuit.

It has a frequency of around 125 kHz and can be used to trigger an alarm receiver.

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