In the figure we have the way to control a flip-flop with the 4069 from positive pulses. The circuit can be used as a shield, if powered by 5 V.
This 80's circuit uses a germanium transistor like the AC121. The circuit has an output...
This circuit is from the Motorola Linear Databook of 1990. The circuit controls a Triac from a...
I found this circuit in a Popular Electronics from 1992. The circuit shows how we can receive...