HOW TO – Build a speech scrambler

HOW TO – Build a speech scrambler

Pe Mar 1970 Covera
Pe Mar 1970 Pg28
Build a Security 1 (speech scrambler) from Popular Electronics March 1970 – Link.

4 thoughts on “HOW TO – Build a speech scrambler

  1. SonicReducer says:

    yes, but how would i get it to fit in the telephone in my shoe?

    what? im a spy!

  2. johnnycannuk says:

    Not exactly a STU-III but proabably pretty cool.

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