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Telephone Circuits
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C=Circuit Schematics
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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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Useful Links
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R=Resource
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Electronics Tutorials, Circuits and Resources
[R]
Electricity Basics
[R]
Electrical Safety
[R]
[R]
Electronics Projects Books
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![[C]](http://www.bowdenshobbycircuits.info/page11.htm#ring1.gif){kind=link}