Intrinsic safety operator logic base circuit - has two groups of four semi-vibrators, centre tapped source and capacitor

摘要

Two groups of four semi-multivibrators have coupling connections only between adjacent semi-multivibrators. The output of each group driving a voltage multiplier via an amplifier. A centre tapped direct current source symmetrically feeds the amplifiers of each group between the mid-point and each of the poles, the positive pole being connected to the negative terminals by one of the groups of semi-multivibrators, the negative pole being connected to the positive terminals of the other group. A capacitor is connected between the mid-point of the supply source and the output of the two voltage multipliers. The input signals are applied between the mid-point of the source and the free terminals of the semi-multivibrators, the output signal being the voltage at the terminals of the capacitor.