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Téléphone à carte SPM detector

Posted: 12 Nov 2002 ?? ?

Print Version ?

Keywords:spm detector? fx631? tlc274? spm signal? microcircuit?

This article describes how two FX631 low-voltage (Subscriber Pulse Metering) SPM detector microcircuits can be used, with additional external filter components, to detect both the 12kHz SPM and the 18kHz security tones employed in the French payphone/cardphone system.

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