Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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Easy-to-build telephone-voice scrambler. A matched pair of devices are required, one on each telephone. Est. cost: $50 each.
ELECTRONICS EXPERIMENTERS HANDBOOK 1994 pg. 123

Telephone scrambler. Protect your confidential telephone calls with this telephone-voice scrambler. The device is inserted into the line between handset and base unit. Both parties required to have a scrambler unit. Est. cost: $60 (kit).
ELECTRONICS NOW Aug 1992 (v.63#8) pg. 37

Audio scrambling system. Prevent eavesdropping by scrambling and descrambling your telephone conversations. Each party requires a scrambler device. Est. cost: $59 (kit).
ELECTRONICS NOW Dec 1993 (v.64#12) pg. 37
Added Info ELECTRONICS NOW Apr 1994 (v.65#4) pg. 13
Added Info ELECTRONICS NOW Jun 1994 (v.65#6) pg. 14

Analyze voice-scrambling techniques using two simple circuits, a voice scrambler and a tremolo.
HANDS-ON ELECTRONICS Aug 1987 (v.4#8) pg. 90

Security 1. A speech scrambler for your telephone conversation.
POPULAR ELECTRONICS [1] Mar 1970 (v.32#3) pg. 27
Correction POPULAR ELECTRONICS [1] May 1970 (v.32#5) pg. 88

Enjoy private messages with a voice scrambler. Est. cost: $34.
POPULAR ELECTRONICS [1] Sep 1974 (v.6#3) pg. 56

Voice scrambler/descrambler circuit.
POPULAR ELECTRONICS [2] Jul 1991 (v.8#7) pg. 70

Telephone Scrambler. Build this electronic device which is used in pairs (one on each phone) to scramble and decode telephone conversations. Est cost: $44 (kit).
POPULAR ELECTRONICS [2] Sep 1993 (v.10#9) pg. 31

Audio scrambling system for use with radiotelephones, telephones, etc. Combination scrambler/descrambler uses a balanced modulator to produce frequency-inversion scrambling.
RADIO-ELECTRONICS Jan 1988 (v.59#1) pg. 51, 67
Added Info RADIO-ELECTRONICS Mar 1988 (v.59#3) pg. 14

Building electrical circuits that can synchronize chaos. Building two systems that exhibit exactly the same chaotic behavior. May be useful for encrypted communications.
SCIENTIFIC AMERICAN Aug 1993 (v.269#2) pg. 120

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