Does your telephone have a harsh or annoying ring? Want to keep the kids from dialing 900 numbers when you're away? Wouldn't it be nice if a telehone could tell you when it's been left off the hook? These and many other problems can be solved easily and inexpensively with Delton T. Horn's Ready-to-Build Telephone Enhancements. Horn shows how to turn an average,every day telephone into something much more. . . a fully functional,multi-purpose home communications system that saves you time,money,and worries. With 30 simple,low-cost projects to choose from,this book offers something for everyonefrom musical ringers to 900-number disconnects to off-the-hook alarms. It's a virtual feast of novel ideas for electronics hobbyists and do-it-yourselfers: a touch-tone signaller and decoder,hold button with music,computerized auto-dialer,call timer with automatic hang-up,long distance lockouts,auto-answering modem,tape recorder interface,and more.
|Publisher:||McGraw-Hill Professional Publishing|
|Product dimensions:||7.37(w) x 9.22(h) x 0.42(d)|