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Audio Circuits:  Intercom
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Intercoms:  #'sN      OZ

Amplifier -- Main Page  

 

Last Updated: November 30, 2017 07:38 AM


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

2-Line Intercom Cum- Telephone Line Changeover Circuit -  The circuit presented here can be used for connecting two tele phones in parallel and also as a 2-line intercom.  Usually a single telephone is connected to a telephone line.  If another __ Electronics Projects for You

2-Wire Intercom -  This Intercom is powered by two 9-volt batteries and uses only current when the Intercom is used.   Both units are connected via a two-wire little cable or simply two wires. __ Designed by Jan Hamer

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. 

Build an Intercom Station Expander -  It's called the "Addacom" and it lets you add four extra stations to any existing 2-way intercom. __ SiliconChip

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 __ Electronics Projects for You

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 __ Designed by Laurier Gendron & Andy Collison

Full-Duplex Intercom -  No complex switching required Simple circuitry, 6-12V supply __ Contact: Flavio Dellepiane, fladello @ tin.it

High Quality Intercom -  A very high quality intercom, which may also be used for room monitoring __ Designed by Andy Collison

Intercom Preamp -  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 __ Designed by Richard Torrens

Intercom systE - M -  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 -  Keep in touch with your family members from one room to another and also from outside areas such as the garage, using this intercom circuit for bidirectional communication.  The advantage of __ Electronics Projects for You

Intercom with fader -  Suitable for tandem bicycles and motor cycles.  Connects to iPod and similar MP3 audio players. __ Contact: Flavio Dellepiane, fladello @ tin.it

Intercom with Musical Ringtone -  Here’s a low-cost two-way intercom circuit with musical ringtone that can be made using readily available components (see Fig.1).Melody generator IC UM66 (IC1) generates ringtone for the intercom circuit.  The __ Electronics Projects for You

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 __ Designed by Richard Torrens

Intercom-Headset-Microphone (Carbon)-Using Model 34  -  No description, just schematicOpAmps 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. 

Intercom-Party-line-Using Model 34  -  No description, just schematicOpAmps 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 TRANSISTORISED INTERCOM -  Several intercom circuits have appeared 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 __ 01/01/2007EFY

Low cost transistorised intercom -  This is a circuit for a low cost intercom that is made by using transistors. __ Designed by Electronics Projects for You

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 __ Designed by Bill Bowden

Low-Cost Transistorised Intercom -  Several intercom circuits have appeared 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 __ Electronics Projects for You

Low-cost Transistorised Intercom -  The circuit described here uses three easily available transistors only.  Even a beginner can easily assemble it on a piece of veroboard.  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.


Intercoms:  #'sN      OZ


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