We found this circuit in an Electronics Now from the 1990s. The circuit crashes when light strikes the sensor. Instead of the alarm a relay can be used to drive higher power devices.
This transmission shield was found in National Semiconductor documentation from the 1980s. Its...
This high-powered megaphone circuit is from a Radio Electronics from December 1964. Note the use...
Simply attach the shaft of a DC motor to the part that rotates so that it becomes a small dynamo in...