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As both units are identical, working of only the first unit is described here. The LM has a gain range from ; by default the value of gain is 20 but can be increased upto by using a capacitor across the pins 1 and 8.
Intercom Using LM386
The main concept behind the circuit is the use of LM audio amplifier which receives the audio signal from microphone, amplifies it and plays it on the speaker. You May Also Like: When you speak in front of the microphone MIC1the low-level signal is amplified by the amplifier built around transistor T1. The circuit is built around two low-power LM audio amplifiers. Ueing circuit is not working.
Intercom circuit using lm386
The circuit also works with carbon microphones or other high-level and low-impedance microphones. Top 20 Computer Engineering Projects.
The audio amplifier amplifies the sound of FM receiver. Mar 14, 20, 5, How to make an FM transmitter January 26, I just used a normal wire for demonstration and the set-up looks something like this below: Apr 25, 1.
The value of resistor R11 is selected such that the voltage between the collector and emitter of T1 is approximately half the power supply voltage. Keep the interconnection cables as short as possible—preferably shorter than 10 metres. Tuesday, Usijg 1, Automated Plant Watering System. It is important that there is no acoustical feedback between the microphone and the loudspeaker on both the sides.
Scematic Machine Inside: Intercom Circuit Diagram Lm
Clap switch December 18, As you can see the circuit is very simple and can be easily built over a breadboard. Apr 26, 6. The input of the amplifier is the microphone microphone has polarity so be careful while connecting itWe cannot amplify the sound from both the microphone at the same time, so we use a SPDT single pole double throw switch as shown above. So minimal appropriate value is chosen for resistor R1 in order to make the input lk386 less vulnerable to electromagnetic noises.
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Most of the schools and offices have intercoms to communicate with people inside a building or a particular campus. If you want other than line-of-sight then it would need to uaing RF. Please enter your name here. Now place the SPDT switch in a position and speak into the respective microphone your voice should be echoed on both the speakers.
The complete circuit is built on a bread board, and is powered by a 9V battery. You can experiment with values from 1kk to get the volume of your choice. Dec 20, 10, 1, Quote of the day. How to make one transistor FM transmitter on a stripboard- page ITS working fine, but the Kind of waves it producing as output as not sinusoidal wave.
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