Found in a 1968 US publication, this circuit produces a delayed pulse with the negative transition of the input signal. The circuit can be used as a shield.
This alarm, found in a 2002 documentation, uses several sensors and has a 12 V supply, not...
This circuit uses a special 1950's RCA strobe tube. It can be built with equivalent components for the rest...
This circuit, which can act as a shield, was found in a 1970s American documentation. The...