Found in a RE Experimenter Handbook from the 90s, this circuit is intended for the use of LEDs in a flashing system for Christmas trees. The circuit can be expanded
With the coded activation of the relays, it is possible to control which of the 16 outputs...
The integrated circuit used in this application is not very common. Transistors and resistors...
This simple circuit makes use of neon lamps to indicate the voltage of a power grid. The lamps are...