An A/V mixer is very different from a standard video mixer in that it has an audio component to it. The Roland VR-3EX is no exception. On the left side, it has a full audio console with many inputs, ...

This audio mixer circuit uses an LM3900 IC but is not a profesional audio dj mixer. The IC houses four integrated Norton amplifiers. The advantage of using the four op amps is that they only need a ...