This circuit was found in the February 1997 Electronics Now magazine. The circuit has a power supply for the NE602 and free inputs and outputs for projects.
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...