This toggle action can be exploited in various relay driver circuits. In the circuit IC CD 4017 is used in the Toggle mode. Its clock inhibit pin is grounded so that IC can run freely. But the reset ...

This circuit can be used as the front end of circuits that require precision 50Hz pulses. The circuit uses two counter ICs CD4060 and CD 4017 to divide the basic frequency to generate 50 Hz pulses.