Found in a Hands On Electronics from the 80's, this circuit activates a relay with alternating touches on the push-button. The relay depends on the supply voltage.
We found this circuit in a 1998 documentation. The circuit can also be used as a minutery...
This triac control was found in the October 1987 Radio Electronics magazine. The triac must be...
Other components of this series of comparators can be used in this TTL interface for CMOS. The...