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Simple Intercom Circuit - Making Easy Circuits
https://makingcircuits.com/blog/simple-intercom-circuit/#:~:text=The%20most%20straightforward%20form%20of%20intercom%20circuit%20would,turns%20feeds%20a%20speaker%20at%20the%20other%20end.
Audio Circuits: Intercom Electronic Circuits
http://www.discovercircuits.com/A/au-intercom.htm
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
Intercom Circuit - ElectroSchematics.com
https://www.electroschematics.com/intercom/
The intercom schematic fulfills its tasks – to provide a reliable communication line and is very simple to construct. The circuit is made up of an amplifier, two switches and two loudspeakers. If additional stations (speakers) are wished, additional switches are just incorporated into the circuit. IC LM382 is used as the final amplifier.
Audio Circuits: Intercom Electronic Circuits
http://www.discovercircuits.com/A/au-intercom2.htm
Simple Circuit Intercom - The simplest possible way to make an intercom is by connecting two loudspeakers in series with a battery, as in the circuit shown here. One of the speakers must be at a remote location. Sound waves impacting on either of the loudspeakers induce a current in its coil which is translated back into sound by the other speaker.
Simple Two Way Intercom Circuit Diagram
https://circuitdigest.com/electronic-circuits/two-way-intercom-circuit-diagram/
The main concept behind the circuit is the use of LM386 audio amplifier which receives the audio signal from microphone, amplifies it and plays it on the speaker. The LM386 has a gain range from 20-200; by default the value of gain is 20 but can be increased upto 200 by using a capacitor across the pins 1 and 8.
Super Simple Intercom | Detailed Circuit Diagram Available
https://www.electronicsforu.com/electronics-projects/super-simple-intercom
To talk over the intercom, press switch S2 to ring up the person sitting on the remote side where the second unit is placed. Then you can speak into microphone MIC1. The person at the other end should be able to hear you through LS1. Similarly, when he rings you up, you should be able to hear him through LS2.
Intercom Circuit - ElectroSchematics.com
https://www.electroschematics.com/intercom-circuit-intercom-schematic/
Intercom Circuit P. Marian In this intercom schematic, the 8 ohm speakers is used as microphone and listening speaker. The 10K potentiometer controls volume and the total gain can be set with de 5k R. Use a double switch with 2 positions so when one is used to talk and the other one to listen. The switch will be in the house.
Audio Intercom by LM380 and BC109C - EEWeb
https://www.eeweb.com/audio-intercom-by-lm380-and-bc109c/
This one is a high quality audio intercom circuit that consists of two identical intercom units and each unit consists of four parts which are a power supply, a microphone preamplifier based on direct coupled BC109C transistors, an audio amplifier based on LM380 2.5W audio power amplifier IC and “Push to Talk” relay circuitry.
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