Carrier Current Baby Alert Transmitter

The baby-alert transmitter is built around an LM324 quad op amp (U1), 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. It has a frequency of around 125kHz and can be used to trigger an alarm receiver.

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Carrier Current Baby Alert Transmitter - Circuitos de Electronica