Integrated Circuit Based Mixers
Page Two (2) of Four (4).




A simple Multi-Input Active mixer circuit
using TL072 Op Amps

As far as mixers go:
This one is an excellent example of simplicity. Not really practicle, because it "lacks" the "basic: Gain Controls needed for practical applications. But, this mixer is a viable candidate for a no-frills circuit to satisfy a requirement to simply combine multiple inputs. It also has the distinction of providing gain necessary to over come insertion loss, therefore can be a unity gain circuit.
A simple Multi-Input Active Mixer
With Input Channel Gain Controls

This is a "more practical" application for an active mixer:

This circuit provides for individual gain controls at the inputs. This allows for adjustments of levels prior to mixing. It also
provides the operator the ability to keep levels at all inputs within acceptable ranges to prevent "overdrive" and excessive volumes.

You will also notice that both of these "active Mixers" have "two" outputs.... Why, because this type of mixer is more likely to be used as an instrumental mixer. The two outputs, allow for the mixer to :feed" two separate amplifiers. This is every rocker's dream - more amps, for louder sound.


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