This circuit controls 6 LEDs in two sets with the phase change cycles controlled by a 555 oscillator. The circuit can be powered by voltages between 6 and 12 V.
Found in a Hands On Electronics from the 90s, this circuit can be easily assembled today, as the...
Found in a 90's EDN, this circuit generates signals in the frequency range given by the graph. The...
This flip-flop circuit with general purpose transistors was found in American documentation from...