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Telephone a carte SPM Detector

Posted: 22 Aug 2003 ?? ?Print Version ?Bookmark and Share

Keywords:FX631? SPM? Subscriber Pulse Metering? security tones? French cardphone?

This application note discuss how two FX631 Low-Voltage (Subscriber Pulse Metering) SPM Detector microcircuits can be used, with additional external filter components, to detect the security tones used in the French payphone/cardphone system.

View the PDF document for more information.

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