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2 Line Output Combiner - Convert consumer equipment stereo signal to
mono or combine audio signal from two different equipments to1-input (added
4/02)
2-Input Mixer - As simple as it gets. mixer consists of two
transistor-based preAmplifiers. first one (designated "Mike in") offers
higher gain. it works well with a regular dynamic microphone. second one
can be used to control audio input from a tape recorder/CD player. (added
6/06)
6 Input Mixer (Andy Collinson) - The mixer circuit below has 3 line
inputs and 3 mic inputs. The mic inputs are suitable for low impedance
200-1000R dynamic microphones. An ECM or condenser mic can also be used, but
must have bias applied via a series resistor. As with any mixer circuit, a
slight loss is always introduced. The final summing amplifier has a gain of
2 or 6dB to overcome this. The Input line level should be around 200mV RMS....(schematic
added 08/08/08)
Circuit to Connect Telephone Equipment to Audio Mixer - I have used
this type of circuits for quick testing of telephone equipment. This is a
quick hack that does not exactly resemble the characteristics of the real
telephone network, but is enough for this kind if applications. If you
want better simulation, change the resistor to 600 ohm and increase the
power supply voltage. And by the way....(added 11/05)
Ever Amplifier Bridging - a design for a simple add-on bridging
adapter for stereo power amplifiers (added 4/02)
FET audio mixer (Aaron Cake) - This simple circuit mixes two or more
channels into one channel (eg. stereo into mono)….(circuit added 7/02)
High Quality Sound Mixer - very ambitious and expected to be very
expensive mixer project, modular design (added 4/02)
