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 circuit, obtained from ancient English documentation, produces a pulse every 24 hours when a 50...
This digital pulse counter offers an LED indication. Its maximum frequency is of the order of 5...
This circuit was found in an old RF documentation. The circuit cuts out the incoming sinusoidal...