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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 (added 4/02)
Low Cost Intercom using Transistors: The circuit comprises a 3-stage resistor-capacitor coupled amplifier. When ring
button S2 is pressed, the amplifier circuit formed around transistors T1 and T2 gets converted into an asymmetrical astable multivib-rator generating ring signals. These ring signals are
amplified by transistor T3 to drive the speaker of earpiece. Current consumption.... (added 10/05)
Old phones as an intercom (circuitsdb): From: mwandel@bnr.ca (Markus Wandel) I have recently thought about this and come
up with a kludgy but workable scheme. Talking over the phones is easy. You put DC current through the phone and.... (added 2/07)
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