This circuit is from Radio Electronics from March 1985. The circuit uses common components at the time and LEDs as indicators. The power supply is 9V.
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...