Carrier-Current Baby-Alert Receiver Circuit

  
The baby-alert receiver is comprised of three transistors: Q2, which is configured as a high-gain linear amplifier; Q3, which serves as both an amplifier and detector; and Q4. which is essentially used as a switch; and a few additional components.
Carrier-Current Baby-Alert Receiver Circuit - schematic

It sounds an alarm BZ1 on receipt of a 125-kHz signal from an alarm transmitter via the 120-V power lines.




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