multi channel audio mixer using lm3900

Posted on Feb 4, 2014

The circuit consists of channel quad amplifier (LM3900). mic audio inputs and direct line inputs are circuit. By adding circuit parallel with this, increase of inputs the applications. input is connected to the inverting terminal of LM3900. The amplifier of each section amplifies every audio input separately and is fed to the output terminals.

multi channel audio mixer using lm3900
Click here to download the full size of the above Circuit.

The output terminal from channel is connected to output line with a resistance not than 680K and produces a mixed audio at the output with low noise. This audio mixer circuit doesn`t use impedance input ideal sources. Capacitors C1 to C4 are the decoupling capacitors for the corresponding channels. C5 is that the output decoupling capacitor. LM3900 series amplifiers four and internally compensated amplifiers that are designed for single and wide power voltage. These amplifiers of voltage inputs good response for all audio frequencies. They output swing.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Inverters form three-phase VCO
    Direct Injection Box for Recording & PA
    LCD Caller ID with AT89C2051
    Stereo balancer
    Make a Simple Machine Gun Sound Effect Generator Circuit
    2 transistor fm voice transmitter
    Case Modding
    High Quality Intercom circuit
    Interactive Toy Traffic Lights
    Digital lighting circuit
    Touch-type FET stepless dimmer