This circuit was found in the Electronics Experimenter Handbook of 1961. The circuit uses door sensors and others. It is powered by 12 V from the car battery.
This configuration, which uses a transistorized circuit in the feedback, provides a logarithmic response...
This ultra-simple test circuit is of great use in any electronics bench. The power is supplied by a...
This circuit was found in a 1977 documentation. It limits the voltage from a source using zener...