This circuit has a maximum frequency of 10 kHz and a linearity better than 0.01%. The circuit is from an 80's documentation making use of integrated of the time.
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...