Flood alarm (CB7994E)

This circuit is from a 90s Popular Electronics. The transistors are of general use and the buzzer is a Sonalert type.

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MCP19124/5 Contains Independent Voltage and Current Control Loops Plus a Full Suite of...
Touch Light Bistable (CB207E)
A flash of light on one sensor or the touch of your fingers on the other type of sensor will turn...
Timer (CB23713E)
This 1-transistor timer was published in Radio Electronics magazine in December 1960. The circuit has...