High Quality Intercom circuit


Posted on Feb 5, 2014

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 power supply, microphone preamplifier, audio amplifier and a Push To Talk (PTT) relay circui


High Quality Intercom circuit
Click here to download the full size of the above Circuit.

t. Only 2 wires are required to connect the units together. Due to the low output impedance of the mic preamp, screened cable is not necessary and ordinary 2 core speaker cable, or bell wire may be used.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Metal Detector circuit
    Trainwreck Blues tube amplifier for Guitars
    70w stk amplifier schematic
    Make this Fancy LED Tail Ring Light Circuit for your Car
    PHOBoS DIY Synth schematics
    microphone CAD equitek E100
    Flash memory interface tutorial covering basic fundamentals
    Datalogging for Arduino
    Two-LED Voltage Indicator
    Ramp generator circuit diagram
    Simple structure hi-fi amplifier



    Top