An easy to build circuit of telephone conversation amplifier. The circuit uses a common LM386 IC, the circuit require no power supply it will run by using the power from phone line.
Here is a telephone line tester circuit which can be used for testing phone lines. This telephone line ....
A very useful simple project of a telephone in use indicator circuit which is very easy to build. The working of the circuit is simple when some one is using the phone...
Simple circuit of a telephone ring tone gererator, the circuit uses CD 4060B and BC 557 transistors. The circuit can be operated from 4.5 to 12 volt DC.
This is a circuit of phone conversation transmitter. The circuit uses one transistor BC547 the circuit doesnt require any power supply it uses phone like volatages as power source, there is no requirement of antenna it also use phone line as an antenna, any good FM radio will work as receiver.
A very good and interesting circuit of telephone voice changer, the circuit performs the task like some computer audio programs do. The circuit uses two ICs and runs form 9.
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