Fault signalling circuit

Fault signalling circuit: The present circuit was developed to make it possible for different sensors to be added to an existing alarm installation. These sensors may be gas or smoke detectors, door switches, 1 infra-red detectors, and others. In quiescent operation, the level at all 44 inputs must be zero. When the relevant sensor is[…]

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Triangular-signal generator

Pulse duration modulators 19%; a perfect triangular signal, that is, one that is absolutely symmetrical with straight sides. Any deviation from this results in distortion. The design is the usual rectangular-triangular oscillator. A Schmitt trigger converts a triangular wave into a rectangular one. which is used to continuously charge and discharge a capacitor via current[…]

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