| 摘要 |
<p>A circuit for monitoring the arrival of a pulse in a pulse sequence is disclosed which safely detects errors in the pulse sequence, component failures or interruptions of the power source. The circuit contains only inexpensive, commercially available components and can be used both in signalling equipment employing relay technology and in all-electronic equipment. The circuit comprises a bistable multivibrator receiving the pulse and two monostable multivibrators. One of the monostables has an input coupled to the noninverting output of the bistable and the other monostable has an input coupled to the inverting output of the bistable. A nonequivalence circuit is connected as desired, to the non-inverting outputs of both monostables or to the inverting outputs of both monostables to detect nonequivalence of the levels at the monostable outputs selected.</p> |
