In the figure we have a basic oscillator with inverters obtained from TTL, CMOS or other gates. The graph on the side allows to find the frequency depending on the resistor and the capacitor.
This control for a traffic light with incandescent lamps was obtained from an English...
This circuit can be powered by 2 or 3 small batteries. The resistor can have values between 220...
This circuit uses three flip-flops and two NAND ports to obtain a frequency division by 5,...