Electronic Circuits And Secrets Of An Old-Fashioned Spy
by Sheldon Charrett
Category: Technology & Engineering

Learn to build bugs or take advantage of those already in place; assemble a DFMF decoder or decode phone tones without one; construct a red box for free pay phone calls; crack answering machine passwords; defeat digital and spread-spectrum cordless phones with an FM phone tap; and much more! For academic study only.