This circuit uses a resonant reed switch at the trigger frequency. The circuit is from General Electric in a 1966 documentation. This type of component is rare today.
This circuit is from a 1979 publication. The sensor consists of plates or screens that, when...
August 2017 - STMicroelectronics' new T850 switches with triacs up to 8 A can be obtained from...
This circuit was found in an 80's Poptronics. The circuit is a fast trigger whose signal can be...