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Baby Alert Device transmitting Circuit

2016-02-19 04:53  
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An alert device for providing a warning of a baby's condition which may lead to the onset of SIDS. The alert device includes a receiver for receiving a signal, which has an element for warning a person proximate to the receiver of the baby's condition. A transmitter for transmitting a signal to the receiver includes a device for connecting the transmitter to a baby and is located remotely from the receiver.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.It sounds an alarm BZ1 on receipt of a 125-kHz signal from an alarm transmitter via the 120-V power lines.Carrier current is a method oflow power AM radio transmission that uses the AC  electrical system of a building to propagate a medium frequency AM signal to a relatively small area, such as a building or a group of buildings. In the United States, carrier current stations do not require a broadcasting license from theFCC , as long as the emissions adhere to the Part 15 Rules for unlicensed transmissions.
 

Carrier-Current Baby-Alert Receiver Circuit