Trigger circuit for use with multivibrators

Claim 1

A monostable multivibrator including trigger circuit therefor comprising: a single monostable multivibrator means having a normally conducting transistor with a collector, emitter, and base and a normally non-conducting transistor with a collector, emitter, and base; trigger means including means responsive to the positive-going transitions in an input pulse signal for triggering said normally non-conducting transistor on to thereby switch said monostable multivibrator means to its unstable state for a predetermined length of time which is set to be always shorter in duration than said input signal; and said trigger means including means responsive to the negativegoing transitions in said input pulse signal for triggering said normally conducting transistor off to thereby again switch said monostable multivibrator to its unstable state for said predetermined length of time, said input signal being a pulse train and said trigger means including means for differentiating said input pulse train so that positive spikes are produced for each positive-going transition in the pulse train and applied to said one transistor and negative spikes are produced for the negativegoing transitions and applied to said other transistor, said trigger means further including a first diode having one pole connected to said differentiating means and its other pole directly connected to the base of said normally non-conducting transistor and a second diode having one pole connected to said differentiating means and its other pole directly connected to the base of said normally conducting transistor, both said diodes being connected to their respective transistors at the same time.