Telephone Accessories You Can Build

Telephone Accessories You Can Build

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Instructions for constructing and installing fifteen telephone accessories, including a remote ring indicator, a speakerphone, a scramble, an autodialer, an answer machine, and a telerecorder, are enhanced by pertinent schematicsRemote Ear 25 When RY3 is activated it switches RY2 out of the control circuit of SSW2 and replaces it with RY4. ... R6 a€” 1M ohms RY1 a€” 12V spst relay R7 a€” 470 ohms RY2 a€” 12V dpdt relay R8 a€” 100 ohms RY3 a€” 12V spdt relay C1anbsp;...

Title:Telephone Accessories You Can Build
Author:Jules H. Gilder
Publisher:Sams - 1976-01-01


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