Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
EE Times-Asia > Networks

Tlphone carte SPM detector

Posted: 12 Nov 2002 ?? ?Print Version ?Bookmark and Share

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.

View the PDF document for more information.

Article Comments - Tlphone car...
*? You can enter [0] more charecters.
*Verify code:


Visit Asia Webinars to learn about the latest in technology and get practical design tips.

Back to Top