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Audio Schematics - Audio Mixers Circuits

2 Line Output Combiner - Convert consumer equipment stereo signal to mono or combine audio signal from two different equipments to1-input

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.

3 Line Mixer

6 Input Mixer (mitedu) - 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.

Audio Voice-Over Circuit

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.

Ever Amplifier Bridging - a design for a simple add-on bridging adapter for stereo power amplifiers

FET audio mixer (Aaron Cake) - This simple circuit mixes two or more channels into one channel (eg. stereo into mono)

High Quality Sound Mixer - very ambitious and expected to be very expensive mixer project, modular design

Line Mixer (Tomi Engdahl) - The circuit is an audio mixer circuit so simple as it can be. There are two dual logarithmic potentiometers in the circuit to adjust the input signal levels and some resistors to do the actual mixing. The circuit is totally passive, so no power supply is needed.

Simple Line Mixer - Most people reading this would be well aware of what a mixer is used for but I'll reiterate here. The job of an Audio mixer is to combine various audio signals into a single audio signal. It is better known in electronic terms as a summing circuit. That is to say that the output is the sum of all of the inputs. A summing note is often represented as a circle with a PLUS (+) symbol in it.

Low cost circuit incorporates mixing & Amplifying functions - EDN-Design Ideas: Using an amplifier with a power-down disable, you can combine the mixer and the amplifier functions.

Microphone Mixer (Aaron Cake) - Designed for3-dynamic microphones

Passive Audio Mixer - This idea came about in order to mix the output from a guitar pickup with a crystal microphone for a harp ( harmonica ) feeding a single mic input to a tube amplifier.  The literature abounds with similar circuits  none of which seem to address the issue of the very high impedances involved.  I have experimentally worked out an approach which does the job.  The over-riding assumption is that your amplifier has plenty of gain.

Portable Mixer - High-quality modular design 9V Battery powered Very Low current drawing

Simple 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.

Simple Line Mixer - I designed this circuit for one friend of mine to be used as a small portable DJ mixer. The circuit is an audio mixer circuit so simple as it can be. There are two dual logarithmic potentiometers in the circuit to adjust the input signal levels and some resistors to do the actual mixing. The circuit is totally passive, so no power supply is needed.

Stage & Recording Mixer - Able to be built in modular form, allowing as many (or few)  channels as desired.

Stereo Mixer (Randy Linscott) - With this circuit you can mix four separate audio inputs. Each input will accept high or low impedance microphones, phonograph, tape or aux signals. You can adjust the gain of each input by adjusting each respective pot. With the Stereo/Mono switch you...

Simple Telephone Test Circuit

Three Channel Audio Mixer

Two Line Output Combiner - Convert consumer equipment stereo signal to mono or combine audio signal from two different equipments to1-input

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.

Voltage Controlled Mixer with Modulator

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