Corrections

NOTICE

The updated PIC-controlled DTMF Decoder circuit mentioned at the end of Circuits & Secrets is complete. Click here for details.

Learn to build bugs or take advantage of those already in place; assemble a DTMF (TouchTone phone) 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. 8 1/2 x 11, softcover, photos, illus., 128 pp.

DTMF Decoder help, including the BS1 program listing & foil patterns, can be found HERE

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• Cellular Frequency Distributions in Excel 97 Format
• BS1 Program Listing
• MS Works Database Cell Mapping Example

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