Logic module connected to act as flipflop

Claim 1

In a logic circuit composed of a first pair of transistors whose emitters are coupled together and are connected to one terminal of a current supply course, the transistors assuming respectively opposite switching states which depend on the relative levels of the control signals applied to their bases, a first pair of collector load resistors each connected to the collector of a respective transistor, at least one emitter follower stage for each transistor having its output connected to the base of its respective transistor and having an input for receiving an input signal, a direct voltage source connected to one transistor of said first pair and poled for reducing the control voltage to its transistor, and conductor means connected between the collector of the other transistor and the input of one emitter follower stage for the one transistor for applying the output of said other transistor to control the one transistor so as to store the output signal being produced by the circuit beyond the period of effectiveness of the input signals, the improvement comprising: a further pair of transistors having their emitters coupled together and connected to one terminal of a further current supply source and each having its base conductively connected to the base of a respective transistor of said first pair; and a further pair of collector load resistors each connected to the collector of a respective transistor of said further pair; said transistors of said further pair assuming respectively opposite switching states which depend on the relative levels of the signals applied to their bases, the resulting output signal of said circuit appearing at the collector of one transistor of said further pair and the complement of such output signal appearing at the collector of the other transistor of said further pair.