multi channel audio mixer using lm 3900

Posted on Feb 6, 2014

By adding the same circuit parallel with this, you can increase the number of inputs according to the applications. Each input is connected to the inverting terminal of LM3900. The built in amplifier of each section amplifies every audio input separately and is fed to the output terminals. The output terminal from each channel is connected to a si

multi channel audio mixer using lm 3900
Click here to download the full size of the above Circuit.

ngle output line with a resistance not greater than 680K and produces a mixed audio at the output with very low noise. This audio mixer circuit doesn`t use a low impedance input to mix idealsources. Capacitors C1 to C4 are the decoupling capacitors for the corresponding channels. C5 is the output decoupling capacitor. If the power supply circuit is far from the mixer circuit, then a 100uF/50V electrolytic capacitor must be connected from the positive supply rail to the ground.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    driving a relay
    why doesnt this circuit oscillate
    Classic Schematics
    CW117 CW217 CW317 charger has a current-limiting protection configuration
    The battery voltage is low frequency amplifying circuit diagram 1v