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Audio Circuits:  Intercom Circuits
Intercoms:  #'s - O      P - Z

Amplifier -- Main Page  
Last Updated on: Thursday, June 25, 2015 06:20 AM

 

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

2-Line Intercom-Cum-Telephone Line Changeover Circuit -  This is a circuit for telephone intercom cum line changeover circuit that can be used to connect two telephones in parallel and also as a 2 line intercom using switches and a ring tone sensing circuit. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

 

8 Line Intercommunication using 89c51 -  This project is aimed to make the low cost intercom system by which eight telephone lines can be interfaced with this hardware. . . .  [designer not identified]

 

Calling bell using an intercom -  Here is a simple calling bell circuit that can be used in small offices to call the office boy using an existing intercom system. The office boy can be called from up to nine locations where extension lines are installed. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

 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 -  A simple 2 way Intercom based on the LM386386 using 8 ohm speakers. . .  [by Laurier Gendron & Andy Collison]

 

Full-Duplex Intercom -  No complex switching required Simple circuitry, 6-12V supply. . .  [Flavio Dellepiane's web site]

 

High Quality Intercom -  A very high quality intercom, which may also be used for room monitoring. . .  [Andy Collison's website]

 

Intercom -  This circuit was requested by an school teacher. It is a simple intercom that anyone can put together and get to work. It is based on the LM380 IC chip. This chip is able to put out 2 watts of power if it is heat sink properly. The following pins. . . .  [Designed by Randy Linscott]

 

Intercom Preamp -  a convenient way of making an intercom is to use a loudspeaker as a microph1. . .  [Richard Torrens]

 

Intercom Schematic -  . . . 

 

Intercom system -  When I was 12 years old, I gained all the parts and skills I needed to make a 2-way intercom system. It consisted of a speaker at the near end, a speaker at the far end, an audio amplifier from a record player, an impedance matching transformer, and a 4PDT "push to talk" switch which reversed the roles of the two speakers. . .  [Designed by Markus Wandel]

 

Intercom Using LM386 -  Use this intercom circuit for bidirectional communication. The advantage of this circuit is that there is no talk/ listen switch as many intercoms have. The circuit is built around two low-power LM386 audio amplifiers. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

 

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 of this intercom is 10 to 15 mA only. Thus a 9-volt PP3 battery would have a long life, when used in this circuit. . . .  [Credit to designer not given]

 

Intercom with fader -  Suitable for tandem bicycles and motor cycles. Connects to iPod and similar MP3 audio players. . . .  [Flavio Dellepiane's web site]

 

Intercom with Musical Ringtone -  Here is a low-cost two-way intercom circuit with musical ringtone that can be made using readily available components. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Intercom with speaker as microphone -  A very convenient way of making an intercom is to use a loudspeaker as a microphone. This is a preamp with a low input impedance suitable for this purpose. . . .  [Page's Author: Richard Torrens]

 

Intercom-Headset-Microphone (Carbon)-Using Model 34  -  No description, just schematic - OpAmps Lab Inc is the manufactor ofAmplifiers (Video / Audio / Distribution / Microphone / Equalization / Line / VCA / Power), Switchers (Routing / Assign / Matrix), Mult (Press) (Network-Feed) Boxes, Audio Transformers, Oscillators, Power-Supplies, Custom Sub-Systems. . . .  [Application OpAmps Lab Inc.]

 

InterCommunication -  This is a great intercom circuit that can be used in many ways. It uses 22V to operate and maybe it will work at a lower voltage (you can try it). For input/output it uses a loundspeaker (20-45 Ohm) on each side. . . .  [designer is not given]

 

Intercom-Party-line-Using Model 34  -  No description, just schematic - OpAmps Lab Inc is the manufactor ofAmplifiers (Video / Audio / Distribution / Microphone / Equalization / Line / VCA / Power), Switchers (Routing / Assign / Matrix), Mult (Press) (Network-Feed) Boxes, Audio Transformers, Oscillators, Power-Supplies, Custom Sub-Systems. . . .  [Application OpAmps Lab Inc.]

 

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 of this intercom is 10 to 15 mA only. Thus a 9-volt PP3 battery would have a long life, when used in this circuit. . . .  [Credit to designer not given]

 

Low Cost Transistorised Intercom -  Several intercom circuits have ap-peared in EFY using integrated circuits. The circuit described here uses three easily available transistors only. Even a beginner can easily assemble it on a piece of veroboard. . . .  [Site does not identify designer]

 

Low Cost Transistorised Intercom -  This is a circuit for a low cost intercom that is made by using transistors. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Low Power Op Amp   Audio Amp Intercom -  The example below illustrates using an op-amp as an audio amplifier for a simple intercom. A small 8 ohm speaker is used as a microphone which is coupled to the op-amp input through a 0. 1uF capacitor. The speaker is sensitive to low frequencies and the small value capacitor serves to attenuate the lower tones and produce a better overall response. You can experiment with different value capacitors to improve the response for various speakers. The op-amp voltage gain is determined by the ratio of the feedback resistor to the series input resistor which is around one thousand in this case. . .  [Bill Bowden, designer]

 

Old Telephones as Intercom -  . . .  [Tomi Engdahl's web]

 

Old Telephones as Intercom (Markus Wandel) -  ASCII format. . . 


Intercoms:  #'s - O      P - Z


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