Telephone Equipment
Electronic Circuits for Hobby and Fair Projects

Home Experiments Science Fair Projects
Electronic Circuits
C=Circuit Diagram
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]
Useful Links
Electrical Safety [R] [R]
Electronics Project Books


Electronic Circuits
Lights & LEDs
Sound Effects
Cars & Motorcycles
Computers / PC
Detectors & Sensors
Electronics Games
Audio & Sound
Clocks & Counters
Power Supplies
Control & Interface
Test Equipment

Electronics Discoveries and Inventions
Heinrich Hertz: Radio Waves
Guglielmo Marconi: Radio
Radio and Wireless Patents
Bell: Telephone Invention
The Invention of the Transistor
Konrad Zuse: Relay Computer
The Oil-Drop Experiment

Electricity Projects Famous Electro Scientists

My Dog Kelly

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Last updated: January 2017
Copyright 2003-2017 Julian Rubin