The pin connections of the 7 4121 (monostable multivibrator) are the same for `dual in line` and `flat package`. Al, A2, and B are control points. In- puts Al and A2 are intended for rapid triggering edges ( 1 V /µs). Input B can be used for relatively slow variations in level ( 1 V /s). The conditions under which the monostable produces a pulse are given in the tables.
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