Normally on led coulometric timing system

摘要

A coulometric timing system having a source of supply with a coulometric timing circuit coupled to a cathode and an anode terminal of a coulometric cell for providing current flow for the electrolytic erosion of the anode filament. An LED is coupled in series circuit with the filament. Regulating diode means is coupled in parallel with the series circuit and to the source of supply for extinguishing the LED when the filament opens.