Found in a 90s Elektor, this mixer makes use of integrated circuits of the time. The supply must be symmetrical at 15 V.
In this circuit, the LEDs light up in sequence until the last one, when the end of the timing is...
This single transistor shield was found in the October 1993 issue of Electronics Now magazine. The circuit...
In the circuit shown in the figure to the side, the relay is activated when the light stops...