Intercom Circuits
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This is a circuit for an intercom is a is a stand-alone electronic communications system intended for limited or private dialogue. Below schematic shows the application circuit of LM390 on intercom. Gain control can be done by capacitively coupling a....
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Create a simple (telephone based) intercom system in our new house. Shouting between rooms is not so good, and trying to use an IM client or Facetime doesn`t have the immediacy of a good shout down the corridor. I`ve got a box of old wired telephones that....
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This is simple intercom circuit. Here I have used common Ic LM380. Now the switch is in the talk position for the speaker on the left, And the other persons position is listening position. If other one wants to speak The switch must be change to another....
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This is a simple form circuit for a 2-station intercom using common 8R mini speakers. The press-to-talk switches should have a spring-return so the intercom can never be left ON. This is the figure of the circuit; Power the speaker from a separate power....
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This is a complete circuit that is shown in the diagram below and is formed by a microphone amplifier built around IC1A, is a design for intercom circuit. In this circuit, there are 2 IC, LM358 that is used to low power dual op amp and 4016 or 4066 Quad....
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This is a design circuit for intercom circuit. 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....
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Intercom walkie talkie are the next logical step in this discussion. They show how a crystal oscillator can be used to transmit voice. Transmitting a voice via a crystal locked oscillator is not easy. This is because the crystal is locking the frequency and....
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The secret to preventing instability (motor-boating) with a high gain circuit like this is to power the speaker from a separate power supply! You can connect an extra station (or two extra stations) to this circuit design. Build the circuit into two....
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An 8 ohm speaker is used both as a microphone and also an output device. The BC109C stage amplifies in common base mode, giving good voltage gain, whilst providing a low impedance input to match the speaker. Self DC bias is used allowing for variations in....
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This is a 2-station simple intercom circuit build based on transistors part and using common 8R mini speakers. The speaker works as microphone and generate sound, so there is no need microphone for this intercom. The "press-to-talk" switches should have a....
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DIY Intercom Circuit Intercom Cable Full-duplex Intercom circuit schematic , cable on the way to the intercom circuit....
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Did you know you can build your own home intercom? Read our instructions and find a circuit of a versatile home intercom system. The unit is able to communicate to as many as ten different locations or rooms discretely and incorporates a single change over....
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A very high quality intercom, which may also be used for room monitoring....
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The circuit mentioned here is a small easy to build Intercom circuit using one LM386 IC one 2N3904 transistor and few other components. LM386 is a very famous amplifier ICs mostly used by electronics hobbyists in audio circuits. In this circuit the 8 ohms....
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A very good quality and simple intercom circuit using only three transistors. By pressing the switch S2 the circuit will generate ring signals. For making two way intercom make two identical circuits and combine them as shown in diagram 2. The current....
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The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom. Usually a single telephone is connected to a telephone line. If another telephone is required at some distance, a parallel line is taken for....
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This is an intercom circuit which use LM380 as the audio amplifier and 2 transistors as the microphone pre amplifier. The sound quality will be good enough with low cost building. This circuit consists of two identical intercom units. Each unit contains a....
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In this card there is a constant current source is used to activate the phone. The LM339 is used to detect out of hand and the hand of the condition. There are circuits repeat the same because we have the phone interface 8. When the phone on hand in the....
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Intercom or Inter communication circuit is a two directional communication system. It provides a reliable communication line and is extremely easy to implement. The circuit is prepared by an amplifier, two switches and two loudspeakers. We can extend this....
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A very simple intercom circuit designed based on transistors. No need for a changeover switch and you can use it just like a telephone....
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Here is a simple but effective intercom circuit that is based fully on transistors. The circuit is based on a three stage RC coupled amplifier. When the pushbutton S2 is pressed, the amplifier circuit wired around T1 & T2 becomes an astable multivibrator and....
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The circuit you are about to see is the culmination of some effort at improving the basic Link intercom design. You may think that pulse dialing is `old hat` nowadays, but the exercise of building and testing the Link `P` in this format, and understanding....
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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...