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Mixers Circuits
Amplifier -- Main Page          Audio Circuits -- Main Page
 

Last Updated: October 09, 2017 03:39 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

1-Transistor Amplifier/Detector -  An amplifier may be added to boost the audio level as shown below.  The current consumption of this amplifier is quite low and a power switch is not included.  Disconnect the battery when the receiver is stored for long periods.   __  Contact: Charles Wenzel of Wenzel Associates, Inc.

2-transistor Radio -  Here is a simple radio that was designed to minimize unusual parts; there isn't even a detector diode! The sensitivity isn't as high as the one-transistor reflex but the simplicity is attractive.  Strong stations will provide plenty of volume __  Contact: Charles Wenzel of Wenzel Associates, Inc.

2-Wire LCD Interface using PIC16cf84 -  Alphanumeric LCD displays have become very popular for microcontroller applications because y can add a lot to a project in a variety of different ways.  A text message givinguser instructions as well as feedback can make application seem much more "professional" and easy to use.  I like to use LCD's to help debug applications, with breakpoints set to display variable and I/O conditions and y are a lot cheaper than using a microcontroller emulator.  To top it off, surplus LCD's can be found for a dollar or less __ Designed by Reynold's Elec

3 Line Inputs, 6 Input Mixer 3 Mic inputs -  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 (  __ Designed by Andy Collison

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.  __ 

Active Mixer Design using the NE25139 Dual Gate MESFET 11/24/97  -  App Note  Doc #903__ California Eastern Laboratories

Amplifier Bridging -  A design for a simple add-on bridging adapter for stereo power amplifiers __ Designed by Rod Elliott  ESP

AN-00-001  Figure of Merit of Mixer Intermod Performance E-Factor -  AN-00-0-01 App Note__ MiniCircuits.com

AN-00-002  Triple balanced, Low cost, LTCC mixers MCA -  AN-00-0-02 App Note__ MiniCircuits.com

AN-00-003  Dual double balanced mixers HJK, HUD -  AN-00-0-03 App Note__ MiniCircuits.com

Audio mixer (ASCII) -  ASCII drawing __ Designed by John Lundgren

Audio Mixer 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...__ Electronics Projects for You

Audio Voice-Over -  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.   __ Designed by Andy Collinson

BPF and Mixer -  SSB Transceiver-Receiver Section:  The signal from the RX/TX relay is filtered by an 80Mtr band pass filter.  This can be replaced by a filter for another band or a bank of switched filters, for a multi band rig.  If you need to cover from 3.5 to 4.0 MHz, you will need to replace the 10p coupling capacitor with one of a larger value (about 18p).  You can wind your own inductors, about 18 turns on a 10K type Toko former will have 5.5 microhenries of inductance. __ Designed by EI9GQ homebrew radio

Broadband 6 GHz Active Mixer with a Glueless Local Oscillator Interface  -  Equipment Needed, Bullet text, CIRCUIT EVALUATION AND TEST, The control software was used to program the desired LO frequency and the output power.  Figure 9 is a sample screen shot of the software configuration used to drive the ADF4351.  See UG-435 User Guide, Evaluation Board for the ADF4351 Fractional-N PLL Frequency Synthesizer and UG-476 User Guide, PLL Software Installation Guide for further information on setting up the ADF4351__ Analog Devices from the Lab

Circuit Incorporates Mixing andAmplifying Functions -  10-Jul-08 EDN-Design Ideas - Using an amplifier with a power-down disable, you can combine the mixer and the amplifier functions __ Circuit Design  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 __ Designed by Tomi Engdahl

CMOS RF PLL Sythesizer -  Synthesizer based on available CD4059.  CD4046 and CD4060 ICs.   __ Designed by Harry Lythall-SM0VPO

Crystal Radio -  The crystal radio gets its name from the galena crystal (lead sulfide) used to rectify the signals.  A "cat's whisker" wire contact was moved about the surface of the crystal until a diode junction was formed.  The 1N34A germanium diode.   __  Contact: Charles Wenzel of Wenzel Associates, Inc.

Crystal Radio RF Amplifier -  One of the best places to add a transistor to a simple crystal radio is at the front end in the form of an RF amplifier.  The circuit below is a simple but effective amplifier which will give surprising performance improvement.  This amplifier __  Contact: Charles Wenzel of Wenzel Associates, Inc.

Crystal Radio Set Version 2 -  This uses a more standard ceramic / crystal earpiece and LT44 transformer that you can buy easily.  Look out though, this is a draft version.   __ Designed by Henry 

Definition of mixer terms -  Application Note__ MiniCircuits.com

Dual double balanced mixers HJK, HUD -  AN-00-0-03 App Note__ MiniCircuits.com

Experiments with Detector Diodes -  When building crystal radios or other simple receivers, the experimenter often wonders about the relative performance of the different diodes in the junk box.  Here are the results of several experiments using the typical.   __  Contact: Charles Wenzel of Wenzel Associates, Inc.

FET audio mixer -  This simple circuit mixes two or more channels into one channel (eg.  stereo into mono).  The circuit can mix as many or as few channels as you like and consumes very little power.  The mixer is shown with two inputs, but you can add as many as you want by just duplicating the "sections" which are clearly visible on the schematic.   __ Designed by Aaron Cake

Figure of Merit of Mixer Intermod Performance E-Factor -  AN-00-0-01 App Note__ MiniCircuits.com

High IIP3 mixers -  I love the works of Anton Chekhov.  Physician, scientist, and — a staggeringly good short story author — who penned crisp, slice-of-live narratives that both entertain + prod you to think deeply.  Chekhov inspires my aude sapere — “my dare to know” self and supplies the tone for my blog: a thin slice of 1 particular QRP workbench.   __ Contact Vasily Ivanenko

High input IP3 mixer enables robust VHF receivers -  08/29/14 EDN-Design Ideas - LTC Design Notes 515: An increasing number of applications occupy the 30MHz to 300MHz very high frequency (VHF) band.  Television and radio broadcasting, navigation controls and amateur radios are a few examples.  Modern RF component development is aimed at much higher frequency bands used for voice and data communications systems __ Circuit Design  by Andy Mo

HIGH IP3 WiMAX MIXERS -  Application Note__ MiniCircuits.com

High Quality Sound Mixer -  This project is probably the most ambitious so far, and can be expected to be very expensive.  On the positive side, it is also capable of excellent performance, and can be tailored to suit your exact specifications.  There are several different input modules in the series, the first being the microphone and line input.   The project is presented in parts, and Part 1 shows the mic/line module and has some background information on noise measurements and the general philosophy behind the project. __ Designed by Rod Elliott  ESP

How to select the proper mixer -  Application Note__ MiniCircuits.com

Improved CMOS RF PLL Sythesizer -  Lock range extended up to about 400:1 (50KHz, 2MHz).  Spectral purity improved, reduced reference frequency FM ripple.  Output level buffered to over 200mW RF power output.  Unecessary DIP switches removed, silly combinations not possible.  BMP format single-sided PCB foil available for downloading.  External VCO/Prescaler PCB to follow shortly (up to 150MHz)  __ Designed by Harry Lythall-SM0VPO

Line 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.  The circuit is suitable  __ Designed by Tomi Engdahl

Low-Cost Incorporates Mixing & Amplifying Functions -  10-Jul-08 EDN-Design Ideas - Using an amplifier with a power-down disable, you can combine the mixer and the amplifier functions __ Circuit Design  by Guus Colman, Guy Torfs, Johan Bauwelinck, and Jan Vandewege, INTEC/IMEC, Ghent University, Ghent, Belgium

LTC Design Note: High input IP3 mixer enables robust VHF receivers -  08/29/14 EDN-Design Ideas - LTC Design Notes 515: An increasing number of applications occupy the 30MHz to 300MHz very high frequency (VHF) band.  Television and radio broadcasting, navigation controls and amateur radios are a few examples.  Modern RF component development is aimed at much higher frequency bands used for voice and data communications systems __ Circuit Design  by Andy Mo

LTCC Mixer for Instrumentation & Military Applications -  Application Note__ MiniCircuits.com

Microphone Mixer -  Designed for 3-dynamic microphonesThis relatively simple mixer was designed for three dynamic microphones, but can be re-designed for more or less.  Level and tone controls are available to tailor the sound to your needs.   __ Designed by Aaron Cake

Mixer & Preamplifier for String Instruments -  Most of the small musical bands have up to four string instruments like guitars and violins.  The signal from the transducers of these instruments should be buffered and sometimes amplified before...__ Electronics Projects for You

Mix-It: an Easy-To Build 4-Channel Mixer -  Anyone can build this high performance four-channel audio mixer...__ SiliconChip

One-Transistor Amplifier/Detector -  An amplifier may be added to boost the audio level as shown below.  The current consumption of this amplifier is quite low and a power switch is not included.  Disconnect the battery when the receiver is stored for long periods.   __  Contact: Charles Wenzel of Wenzel Associates, Inc.

PolyPhase Surface Mount Power Supply Meets AM D Athlon™ -  DN216 Design Notes__ Linear Technology/Analog Devices

Portable Mixer -  The target of this project was the design of a small portable mixer supplied by a 9V PP3 battery, keeping high quality performance.  The mixer is formed assembling three main modules __ Contact Flavio Dellepiane, fladello @ tin.it

Post Mixer Amp -  SSB Transceiver-Receiver Section:  The post mixer amplifier, makes up for the losses in the passive mixer and I.F.  port attenuator.  The transistor is a 2N4427, if you don't have one, try a 2N3866, 2N5109, on any similar, medium power VHF transistor.  The output transformer is 10 turns with a tap at 4 turns.  The core is the same, high permeability ferrite ring, used in other parts of this project.  The output supplies DC current for the RX/TX switching diodes at the SSB filter input __ Designed by EI9GQ homebrew radio

Simple Circuit Crystal Radio -  The crystal radio gets its name from the galena crystal (lead sulfide) used to rectify the signals.  A "cat's whisker" wire contact was moved about the surface of the crystal until a diode junction was formed.  The 1N34A germanium diode.   __  Contact: Charles Wenzel of Wenzel Associates, Inc.

Simple Circuit Line 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.  The circuit is suitable  __ Designed by Tomi Engdahl

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.  And by the way __ Designed by Tomi Engdahl

Simple Circuit Two-transistor Radio -  Here is a simple radio that was designed to minimize unusual parts; there isn't even a detector diode! The sensitivity isn't as high as the one-transistor reflex but the simplicity is attractive.  Strong stations will provide plenty of volume __  Contact: Charles Wenzel of Wenzel Associates, Inc.

Stage & Recording Mixer -  This project is probably the most ambitious so far, and can be expected to be very expensive.  On the positive side, it is also capable of excellent performance, and can be tailored to suit your exact specifications.  There are several different input modules in the series, the first being the microphone and line input.   The project is presented in parts, and Part 1 shows the mic/line module and has some background information on noise measurements and the general philosophy behind the project. __ Designed by Rod Elliott  ESP

Super Mixer -  The mixer described below differs from most mixer circuits in that all the inputs are not only adjustable but fed to a common amplifier which has an adjustable overall gain .  It allows for a weak signal to be amplified and attenuate the other inputs for an even output level of all inputs.   __ Contact © Laurier Gendron, Burnaby, B.C., Canada

Telephone Test with 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 you can also feed signals to telephone if you connect the circuit output wires to small amplifier output.   __ Designed by Tomi Engdahl

TL431 Crystal Radio Amplifier -  Here is a simple audio amplifier using a TL431 shunt regulator.  The amplifier will provide room-filling volume from an ordinary crystal radio outfitted with a long-wire antenna and good ground.  The circuitry is similar in complexity to a simple one-transistor radio but the performance is far superior.  The TL431.   __  Contact: Charles Wenzel of Wenzel Associates, Inc.

Triple balanced, Low cost, LTCC mixers MCA -  AN-00-0-02 App Note__ MiniCircuits.com

Very High Gain Crystal Earphone Amplifier -  This simple, one-transistor amplifier provides a voltage gain over 1000 (60 dB) for driving a high impedance ceramic (crystal) earphone.  The high gain is achieved by replacing the traditional collector resistor.   __  Contact: Charles Wenzel of Wenzel Associates, Inc.

Voice-Over -  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.   __ Designed by Andy Collison

Why do we need Mixer? -  Article:  The mixing of a number of audio signals is such a common thing to do that one would expect the Net to be riddled with articles on how and why signals are mixed.  There are plenty of circuits that show how it can be done, but very little that explains the benefits or drawbacks of any particular scheme.   __ Designed by Rod Elliott  ESP


Mixer Circuits

 


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