Found in a documentation from the 90's, this circuit uses only one integrated circuit. The resistors in series with the LEDs depend on the power that can be between 5 and 12 V.
Found in a Popular Electronics from the 90s, this game can be seen in other configurations on this site. The...
This single-channel remote control transmitter operating in the FM range uses common components and...
Although it is a common configuration today, this circuit was taken from an old publication. The...