Two station intercom based on lm386 electronic schematic. The default gain of the lm386 amplifier is just about perfect for this circuit, it can drive low and medium impedance headphones quite adequately. An important notice at the end of this data sheet addresses availability, warranty, changes, use in safetycritical applications, intellectual property matters and other important disclaimers. Feb 5, 2017 component, lm386 audio amplifier circuit diagram simple intercom pdf easy wireless with ringer transistor telephone for home communication low cost. Simple wired intercom, simplexduplex for 3,5mm jack headset.
By using external parts voltage gain can be raised up to 200. Lm386 is a power amplifier designed for use in low voltage consumer applications. The lm386 is a power amplifier designed for use in low volt age consumer applications. Use a double switch with 2 positions so when one is used to talk and the other one to listen. Lm386 snas545c may 2004revised may 2017 lm386 low voltage audio power amplifier 1 1 features 1 battery operation minimum external parts wide supply voltage range. Lm in this intercom schematic, the 8 ohm speakers is used as intercom circuit diagram. When it operates from a 6 volt power supply, quiescent power will be 24 milliwatts, which makes lm386 for ideal battery operation. Some things about it make perfect sense to me, but others are baffling. Lm386 low voltage audio power amplifier datasheet rev. May 08, 2014 get more exclusive content on electronics including resources, diy and project ideas at follow our design community on facebo. As you can see the circuit is very simple and can be easily built over a breadboard. A very good quality and simple intercom circuit using only three transistors. The chip has options for gain control and bass boost, and it can also be turned into an oscillator capable of outputting sine waves or square waves.
One such simple audio circuit is proposed here using the ic lm386, which requires very few other external passive components for functioning. The circuit is built around two lowpower lm386 audio amplifiers. May 19, 2016 the schematic is for a fullduplex intercom fullduplex meaning that everyone can talk, and be heard, at the same time, like a telephone party line. Aug 24, 2019 now i am going to show you 3 intercom circuit using lm386. In this circuit the 8 ohms speakers are used for both purposes one as speaker. Lm386 audio amplifier intercom using lm386 lm386 fixed low gain audio power amplifier lm386 lm386 audio amplifiers lm380 volume gain control of lm386 lm380 equivalent lm386 sound amplifier circuit. Two way intercom circuit diagram using transistors and. Each is self contained with its own battery, speaker, microphone and amplifier circuit.
Two station intercom based on lm386 circuit scheme. The lm386 is a power amplifier designed for use in low voltage consumer applications the gain is internally set to. When we turn switchs1 in a position talk show in the circuit. 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. It is widely available, used a minimum of external parts and is well suited to battery. Only a couple resistors and capacitors are needed to make a working audio amplifier. Lets make up an small intercom projects with old equipment. The circuit mentioned here is a small easy to build intercom circuit using one lm386 ic one 2n3904 transistor and few other components. The lm386 based intercom electronic circuit operate as two separate entities with switches at either station controlling which will transmit or receive.
An lm386 is a very popular and widely used audio amplifier chip that permits a user to amplify sound. For this intercom circuit you can use a 8 ohms speaker, one for each station. Dual 2wire analog audio to 4wire analog audio interface. Lm386 audio amplifier circuit diagram simple intercom pdf. The loudspeaker of the first circuit will perform as a microphone. 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. It is widely available, used a minimum of external parts and is well suited to battery operation. Mini project intercom lm386 by abid parwez capacitor. Build a great sounding audio amplifier with bass boost. The electronic intercom schematic use two separate lm386 circuits one amplifier for each station. Two way intercom circuit diagram using transistors and um66. Lm386 snas545c may 2004revised may 2017 lm386 low voltage audio power amplifier 1 1 features 1 battery operation minimum. Download as docx, pdf, txt or read online from scribd. Browse our book collection and download books for free.
I see that my son is boring, and do not want him sitting to play the games computer all day so have new ideas. The advantage of this circuit is that there is no talklisten switch as many intercoms have. How can i make a simple 3 way intercom circuit with discrete parts. It is widely available, used a minimum of external parts and is. Two station intercom based on lm386 schematic design. Mar 21, 2015 intercom systems for home voice intercom more circuits by ic lm386 lm390 mini intercom oday we find many of the ic number lm390 in the old tool box. The gain is internally set to 20 to keep external part count low, but the. This setting also applies to the related rvonio voip product. Before moving into the circuit details lets have a peek at some of the technical specs of the ic.
The value of the capacitors from the electronic schematic are in microfarads. Ic1 um66 and transistor q1 forms the ringer section. The ic lm386 is a power amplifier used for amplifying small audio signals with low supply voltages. Simple two way intercom circuit diagram circuit digest. In this intercom schematic, the 8 ohm speakers is used as microphone and listening speaker. Will pay someone to create this circuit for nutone intercom circuit adapter for ring doorbell. Audio intercom by lm380 and bc109c eeweb community. By pressing the switch s2 the circuit will generate ring signals. Block diagram of intercom using lm shows the two pcb. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200.
Two station intercom based on lm386 circuit wiring diagrams. The gain range is 20 to 200, gain is internally set to 20 without using external component but can be increased to 200 by using resistor and capacitor between pin 1 and 8, or just with a capacitor. Lm386 is a very famous amplifier ics mostly used by electronics hobbyists in audio circuits. It uses two wires to run between each intercom unit. Build a great sounding audio amplifier with bass boost from.
How to build small, simple audio amplifiers using ic lm386. 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. Lm386 circuits and projects 9 browse through a total of 9 lm386 circuits and projects. Two station intercom this kit is a two station intercom. Each is self contained with its own battery, speaker, microphone and amplifier circuit based on the lm386. Sep 25, 2017 we have so many collections wire wiring diagrams and schematics, possibly including what is you need, such as a discussion of the intercom circuit diagram lm386. Jan 26, 2018 the complete circuit diagram of this intercom project is given below. This intercom circuit does not require a changeover switch and you can use it just like a telephone and a ringer circuit is also included.
The lm386 based intercom electronic circuit operate as two separate entities with switches at either station controlling which will transmit or. This electronic schematic circuit is a very simple two way electronic intercom circuit based on a lm386 audio amplifier circuit. Lm386 low voltage audio power amplifier echelle inconnue. Lm386 stereo amplifier in bridge 2 watts electronics. Lm380 1features description wide supply voltage range. Doorphone intercom by ic lm386 circuit wiring diagrams.
Need help with my portable 2 person intercom circuit. Lm386 is a low voltage audio amplifier and frequently used in battery powered music devices like radios, guitars, toys etc. For making two way intercom make two identical circuits and combine them as shown in diagram 2. Lm386 low voltage audio power amplifier general description the lm386 is a power amplifier designed for use in low voltage consumer applications. A simple intercom circuit designed based on transistors is shown here. If the images produced less suitable way you can look for it using the search box. From startup lessons to product management and sales insights, we enjoy sharing many of the lessons weve learned over the years. Feb 5, 2017 component, lm386 audio amplifier circuit diagram simple intercom pdf easy wireless with ringer transistor telephone for home.
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