Surveillance circuitry for an input voltage

摘要: 1. A circuit arrangement for monitoring an input voltage (UE), wherein operating (UB), which is buffered in energy store (G), produced from the (UE) a control (S) at least partly composed of digital switching circuits and supplied to sensor (F) time element (Z1, Z2) connected emits alarm signal (M) if smaller than predetermined threshold value (US), characterised that formed by first stage (Z1) second (Z2), upon pick-up (M), (S1) (S), sets rest position circuit, particularly little required duration greater (VI) itself leaves when said one has disappeared continues functions started before setting into position, (Z2) switches off (UB) (V2) exceeds (V1).