This circuit was found in an Elektor from the 90s. It is a circuit that generates different types of sound effects. The components are still common today.
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...