Table of Contents Section 1. General Information 1. Basic Telephone Principles 2.The Telephone Company and you 3.Electronic Construction Techniques 4.Solid-State Devices Specifications Section 2.Electronic Telephone Projects 5.Soft Tone 6.Telephone Sentry 7.Telephone Bill 8.andandandandandandAutomatic Record/ Call 9. Speakerphone 10. Dial Tone 11.Auto-Dial 12.Ring-A-Thing 13.Telephone Trigger 14.CB Telephone Patch 15.Conferencer 16.Telephone Beacon 17.Automatic Bell Cutoff 18.The Babysitter 19.Telephone Computer Memory 20.Duo-Phone 21.Touch Tone Dialer And Electronic Ringer 22.The Frustrator 23.Tattletale 24. Telephone Night Light 25. Telephone Toll Restrictor