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2 Line Intercom Cum Telephone Line Changeover Circuit:
2 Line Intercom With Telephone Line Changeover Circuit: The circuit
presented here can be used for connecting two telephones in parallel and also as
a2-line intercom.
Creating your Own Telephone Ne2 Rk: you can easily create your own intercom
system using two telephones, a 9-volt battery (or some other simple power
supply) and a300-ohm resistor
Door Phone Intercom:
Doorphone Intercom:
Head set Intercom :
High Quality Intercom:
IFB Intercom :
Intercom Preamp: a convenient way of making an intercom is to use a
loudspeaker as a microph1-
Intercom:
Low Cost Transistorized Intercom:
Old Phones As An Intercom:
Old Telephones As Intercom:
Party line Intercom :
Remote Control using Telephone: Here is a tele-remote circuit which enables
switching "on" and "off" of appliances through Telephone lines. The circuit
described here can be used to switch up to nine appliances (corresponding to the
digits1 through 9 of DTMF the Telephone key-pad). The Telephone can be used to
switch on or switch off the appliances also while being used for normal
conversation. FAIR WARNING -- THIS SITE HAS ANNOYING POP UP ADS.
Two Line Intercom Cum Telephone Line Changeover Circuit:
Two Line Intercom With Telephone Line Changeover Circuit: The circuit
presented here can be used for connecting two telephones in parallel and also as
a2-line intercom.
Using the Comrex Hotline or Vector on a Dry Pair: how to use simple pair of
wires with no voltage, ringing signals to interconnect normal Telephone line
devices. |
