This circuit for old flashes with xenon lamps was found in a Radio Electronics magazine from June 1966. The sensor is a photoelectric cell from the time. Power is supplied by a 9 V battery.
This oscillator circuit for sinusoidal audio signals with operational 741 requires a symmetrical power...
Found in a 1974 Radio Shack documentation. This circuit must have a connection to the ground of...
This sensitive circuit detects the live pole of a power grid or outlet. The circuit makes use of a high...