This circuit was found in Motorola's Linear Interface ICs of 1993. The integrated circuit used is not common and the load current depends on the Triac.
Found in a 1968 US publication, this circuit produces a delayed pulse with the negative transition...
We found this circuit in an American publication from the 50s. The transistors are made of...
This 2005 circuit was found in an English publication and can be implemented with virtually any...