This debouncer circuit uses a transistor to produce a single pulse when the switch is triggered. The transistor conducts when the switch is opened. We found this configuration in an 80's publication.
This oscillator, which can be used as a signal injector, was found in a Popular Electronics from the 90s....
This circuit was found in a Dutch documentation from 1970. The circuit makes use of semiconductors that...
This circuit is from a publication from the 70s, but it can be assembled with any diac and a Triac...