Analogue monoflop - using an opamp as a comparator

Monoflops are automatically associated with digital circuits, but there is no reason why they should not be used for analogue purposes. Obviously, the opamp involved will not be used as an amplifier, but as a comparator. The 741 is implemented in both of the circuits shown here, although, as a matter of fact, practically any type of amplifier will suit this application. Modern IC technology makes life much easier for the designer in that four opamps can be incorporated in a single tiny package. More often than not, however, one of the opamps is not required, which is a bit of a waste, and what"s more, an additional digital chip is needed to effect a specific time delay. But the latter can be omitted by combining an opamp with a monoflop. Operation is quite straightforward. The inverting input is set at a fixed voltage level, (slightly more than half the supply voltage). The non-inverting input is grounded by R5 and P1. The analogue monoflop . . . ).. . using an opamp as a comparator