The TTL-I 7.4123 comprises two monoflop (MF! and MF2) which can be triggered by a positive edge on the respective B-input. In this circuit Q2 is connected to B 1, and Q 1 to B2; so the two monoflops MF l and MF2 to- gether form an astable multivibrator. The cycle time is determined by the sum of the pulse times of the monoflops.
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