Flood alarm (CB7994E)

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

12V x 40W Flasher (CB6765E)
This circuit was found in a 1965 General Electric documentation. SCRs and unijunction may be...
Stereo FM Transmitter with the BA1404 (CB12595E)
The BA1404 integrated circuit (not very easy to obtain) consists of a complete stereo FM...
Amplifier stage 2N649 (CB23623E)
This circuit is from a Radio Electronics documentation from July 1959. In this documentation the...