Monday, September 1, 2014
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Transistor intercom circuit
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Here is a simple but effective intercom schema that is based fully on transistors.The schema is based on a three stage RC coupled amplifier. When the pushbutton S2 is pressed, the amplifier schema wired around T1 & T2 becomes an astable multivibrator and starts producing the ringing signals. These ringing signals will be amplified by the transistor T3 to drive the speaker. When the push button S2 is released the schema will behave as an ordinary amplifier and you can talk to the other side through it.
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To construct a two way intercom, make two identical copies of the schema given below and connect it according to the given connection diagram. The stand by current consumption of this schema is around 20mA.
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Notes. * Assemble the schema on a good quality PCB. * Use 9V PP3 battery for powering the schema. * The Mic M1 can be condenser micro phone. * Use push to ON type push button switch for S2. * Use a slide switch for switch S1.S1 can be used to power the schema.
Transistor intercom circuit
Here is a simple but effective intercom schema that is based fully on transistors.The schema is based on a three stage RC coupled amplifier. When the pushbutton S2 is pressed, the amplifier schema wired around T1 & T2 becomes an astable multivibrator and starts producing the ringing signals. These ringing signals will be amplified by the transistor T3 to drive the speaker. When the push button S2 is released the schema will behave as an ordinary amplifier and you can talk to the other side through it.
Notes. * Assemble the schema on a good quality PCB. * Use 9V PP3 battery for powering the schema. * The Mic M1 can be condenser micro phone. * Use push to ON type push button switch for S2. * Use a slide switch for switch S1.S1 can be used to power the schema.
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