A SCA Adapter for FM Music

This Circuit was NOT Designd by me and the Designer is Unknown.

However It has been tested and works well, so I designed a PCB for it.

Created "Mar 1, 2005"
Latest Revision Dec 31, 2009 

S.C.A.  Is an Abbreviation for: "Subsiduary Communication Authorization".


This applies to an Additional 67 Khz Modulation on the standard FM Carrier.
It is intended to provide Commerical-Free Background Music for Stores, Offices and others.


The Origional Schematic was not very good so I have Re-Drawn it.

I suggest this unit be plased between the Reciever and amplifier.
Before any Volume controls or tone controls.




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 The Schematic


 The PCB


 Picture Overlay, Courtesay of "Paul" in Ontario, Canada.
I Assume it is Correct.





All Imformation in this Article is "Copyright Protected".



 Chemelec 
 *Copyright © 2005 & 2009*