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  • Circuits
    C=Circuit Schematics
    Privacy Circuit [C]
    Telephone Record Control (3 transistors) [C]
    Extremely Simple Telephone Record Control (only passive components) [C]
    Telephone "Hold" With Music [C]
    Telephone "In Use" Indicator [C]
    Extra Phone Ringer [C]
    Ringing Phone Light Flasher [C]
    FM Telephone Bug [C]
    Telephone Ring Generator Using Small Power Transformer [C]
    Remote Control Using Telephone [C]
    Old phones as an intercom [C]
    Doorphone Intercom [C]
    Simple Intercom System (3 transistors) [C]
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    Last updated: June 2013
    Copyright 2003-2013 Julian Rubin