The configuration shown was found in the October 1974 Radio Electronics magazine. The integrated circuit used is the CD4001 and the power supply depends on the application.
In the figure we have the receiver of a sequential remote control operating at a frequency in the range of...
This circuit is from an American 1967 documentation and can be implemented with modern equivalent...
We found this circuit in a French publication from the 1980s. The coils L1 and L2 are formed by 4...