Found in a 1967 documentation this circuit can be applied to any operational amplifier. Components without values determine the frequency to which the circuit is tuned.
EDN magazine in a 90's issue published this TTL technology debouncer flip flop circuit, in this...
This circuit from a 90s Popular Electronics, decodes the old analog TV signal. It works with a...
This circuit that can only be used with simple resistive and inductive loads (never electronic) was...