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.
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 9v.
Here is a very simple and useful project of a telephone ring detector circuit. The circuit can be used to switch on a loud buzzer when phone rings...
This telephone off hook indicator circuit will activate when the telephone receiver is taken off hook. The circuit is using an LED and a peizo buzzer, which will...
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