3 Line Mixer - This project is a 3 or more lines mixer. For more than 3 inputs you can repeat the input
parts (P=10K R=22K). It powered with 9Vdc. . . . [Designer's name not given]
6 Input Mixer - 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 (. . . [Andy Collinson,
Audio mixer (ASCII) - . . .
with Multiple Controls - When recording sound from several
orchestral instruments being played by different musicians using a single microphone, the only way to adjust the
sound balance is to change the position of the musicians relative to the microphone. When recording direct to
stereo master tape, itís crucial to make sure that all the voices and instruments sound right before you hit the
record button. . . . [© EFY Enterprises Pvt. Ltd. All rights reserved.]
Audio Signal Source - This is a lovely project for home constructors keen on building their own test and
measurement (T&M) equipment. It makes use of the ICL8038 signal generator chip, manufactured by Intersil. An
improved version, made by Exar corp. is available (XR8038A). It can be used to produce three types of waveforms,
sine, square and triangle. The frequency, amplitude and duty cycle can be varied, and selection of waveform is
done digitally. . . . [Tony and Wilfred of Mixed Fruit Jam]
Audio Voice-Over Circuit - This is a circuit where a microphone and preamp circuit (voice circuit) have priority over
any other audio signal. You can think of this as a one way intercom, if the main amplifier is used for listening
to music, then when the push to talk switch is pressed, the amplifier is switched to the voice signal. . . .
Circuit Incorporates Mixing andAmplifying Functions - 10-Jul-08 EDN Design Idea Using an amplifier with a power-down disable, you can combine
the mixer and the amplifier functions. . . [by Guus Colman, Guy Torfs, Johan Bauwelinck, and Jan Vandewege,
INTEC/IMEC, Ghent University, Ghent, Belgium]
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. . .
Ever Amplifier Bridging - a design for a simple add-on bridging adapter for stereo power amplifiers. . . [Rod Elliott
- ESP (Original Design)]
FET audio mixer - This simple circuit mixes two or more channels into one channel (eg. stereo into mono) . .
. [Circuit designed by Aaron Cake]
High Quality Sound Mixer - Very ambitious and expected to be very expensive mixer project, modular design. . . [Rod