Folder CD-81719-01 404 405 Dial Tone Generator

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pdf CD-81719-01 4A And Appendices 1B 2D 3D 4D Popular

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CD-81719-01_4A_and_Appendices_1B_2D_3D_4D.pdf

CD-81719-01 4A And Appendices 1B 2D 3D 4D

Signaling Circuit 404 and 405, Dial tone generator for PBX "Touch-Tone" Calling.  Contributed by John Novack.

pdf SD-81719-01 404 405 Dial Tone Generator Popular

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SD-81719-01_404_405_Dial_Tone_Generator.pdf

SD-81719-01 404 405 Dial Tone Generator

Scanned and Contributed by Paul Wills 

pdf SD-81719-01 Sheet B1 - Better Scan Popular

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SD-81719-01-B1-better-scan.pdf

SD-81719-01 Sheet B1 - Better Scan

The sheet in the original document from the CIC was light so the scan was not very readable.  This was an attempt to make it slightly less unreadable.

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Read the articles under "Introduction" in the black menu bar above.

Recent Contributors

Thanks for new documents from Jim Hurtle, Ed Palazzo, Paul Fassbender, Bruce Patterson, Remco Enthoven, Jon Kolger, Paul Ivester, Len Hicken, Fred Haynes, Kurt Rudolph, Wade ("Kellogg KITT"), the Connections Museum, Rick Walsh, Jeff Lamb, Jeremy Walters, Alan David, Dennis Hock, and Tim Griffin.

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