Block diagram of Intercom using LM shows the two PCB Unit (Unit1 & Unit2). and ground will be used common for both. Both are the Transceiver. LM In this intercom schematic, the 8 ohm speakers is used as Intercom circuit diagram. intercom . This website uses cookies to improve your experience. In this circuit we are going to build a very Simple Intercom Circuit using which The main concept behind the circuit is the use of LM audio.

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How to reduce noise distortion lntercom audio amplifier? You can also upgrade this project by adding another SPDT switch to turn of the speaker on your side when you are talking.

Project Engineer 22 December Yes, my password is: Most cheap intercoms use “press button to talk” or half-duplex “voice switching” to avoid feedback. I would like it to be powered by a 9v battery….

This audio amplifier module can be used to play your FM receiver kit, make infrared based music transmitter and receiveretc. The LM has a gain range from ; by default the value of gain is 20 but can be increased upto by using a uskng across the pins 1 and 8.


Use of capacitor C18 is optional. The preamplifier may exhibit instability at very high frequencies. HelloI’ve made this intercom circuit and it works just fine, however, i want to make it wireless but i don’t know howany ideas? Right now both interckm speakers will always be active to keep things simple, so do not worry if you hear yourself on the speaker on your end.

The circuit is built around two low-power LM audio amplifiers. Quote and Order boards in minutes on https: As both units are identical, working of only the first unit is described here.

Well basically i want it one sided only 1 transmitter and 1 receiver and for starters about 5m apartwhat should i do? Intercom circuit using lm Reply to Thread.

Audio amplifier using LM386

The value of resistor R11 is selected such that the voltage between the collector and emitter of Inetrcom is approximately half the power supply voltage. If a higher dynamic range is needed, the power supply should be 9V or even 12V.

Top 20 Computer Engineering Projects. I did this but it is not working.

LM386 electronic intercom circuit

Use a shielded cable for connecting the microphone to the circuit. As the gain of each channel is not very high, the probability of acoustical feedback is low. Log into your account. You have entered an incorrect email address! Assemble the circuits ,m386 units 1 and 2 on separate general-purpose PCBs and enclose in suitable cabinets.


So only one person can talk at a time, this type of communication is called half-duplex communication and this is what we see in walki-talkies. The audio amplifier amplifies the sound of FM receiver.

Simple Two Way Intercom Circuit Diagram

Please enter your comment! Initially you can experiment with the circuit by blowing air into the microphone and check if the speaker produces some noise. For power supply, you can use an AC-DC wall adaptor, dry batteries or rechargeable batteries. Tuesday, January 1, Useful Raspberry Pi Projects. For example, if the emitter of T1 is connected to the ground, the value of R12 could be as low as 1 kilo-ohm usually, the usnig is ohms to 4.

Do you mean you want to talk in only one direction? Keep the interconnection cables as short as possible—preferably shorter than 10 metres.

But, will the sound of the person of any microphone be heard in both speakers? I have tested it on Proteus. Resistor R12 should have a minimal value.