A non-sinusoidal 120 V voltage can be obtained with this circuit found in the December 1992 Radio Electronics magazine. The power is a few watts.
This highly sensitive light sensor was found in a 1970 General Electric documentation. The circuit...
The given number circuit is used to activate the relay by interrupting the light beam that hits...
This alarm circuit with sensors in series was found in the Electronics Now magazine of June 1994....