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Audio Circuits:  Level, Tone and Balance Circuits
Audio Circuits -- Main Page

Automatic Level Tone Balance:  #'s - A      B - H      I - R      S - Z


Last Updated: October 24, 2017 02:54 PM

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

Three Band Equalizer -  Using a single op-amp this easy to make equalizer offers three ranges, low frequency, mid frequency, and high.  With component values shown there is approximately +/-20dB of boost or cut at frequencies of 50Hz, 1kHz and 10kHz.  Supply voltage may be anything from 6 to 30 Volts.  Maximum boost 20dB is only realized with maximum supply voltage __ Designed by Andy Collison

Three Level Audio Power Indicator -  Battery-operated3 LED display that connect it to loudspeaker output __ Contact: Flavio Dellepiane, fladello @ tin.it

Tone Control -  This is mono tone control which contain 2 potensiometers to control the level of bass tone and treble tone.  You could make the stereo tone control by duplicate this circuit, use stereo potensiometers and add mono potensiometer at input or output for balance adjustment.

Tone Control -  Based on the classic Baxendall tone control circuit, this provides a maximum cut and boost of around 10dB at 10K and 50Hz.  As the controls are passive, the last transistor provides a slight boost.  The output. __ Designed by Andy Collison

Tone Control using TDA1524A Tone Control IC -  This simple tone control can be used in may audio applications.  It can be added to amplifers, used as a stand alone control module, or even built into new and exciting instruments.  It's one IC construction makes it a very compact circuit, as only a few support components are required.  Plus, it does not use a dual power supply.  This means that the circuit will run from 9V to 15V (although the bass will be a little weak at 9V).  The circuit is by Robert Barg and originally appeared in the Think Tank column of the May 1998 issue of Popular Electronics. __ Designed by Aaron Cake

Tone Detect with the NE567 T -  one detection circuit with the NE567 

Tone Detector -  This is also designed to be in conjunction with the sound detector amp/electret mike amp.  this circuit is designed to trigger on a 1 khz tone.  to change this frequencyrefer to the table below, then change the resistor and capacitor values accordingly __ Designed by Andy Wilson

Tone Generator -  this tone generator can be used to control your robot.  you will need to use the tone decoder for this.  to widen the range, higher or lowersubstitute a higher, or lower valued capacitor for c1. __ Designed by Andy Wilson

Triple-Mode Tone Generator -  Here is a simple circuit that generates three different tones.  You can use it as a call bell, burglar alarm or any other security alarm.Fig.1 shows the circuit of the __ Electronics Projects for You

Tube provides linear tuning -  11/05/98 EDN-Design Ideas (File has many circuits, scroll to this one)  Parallel LC circuits that you tune by changing capacitance have a nonlinear frequency-versus-voltage or frequency-versus-shaft-position characteristic.  The frequency of an analog-tuned circuit is proportional to the reciprocal of the square root of the tuning capacitance.  When you tune a bandwidth that is say, 5% or less of the center frequency, the frequency-versus-capacitance__ Circuit Design by Lyle Williams, Electronic Technical Services, New Orleans, LA

Two Tone Generator -  This two-tone generator includes 3 ICs NE555 Astable Multivibrators.  You can vary the duration of each tone by changing the 10k resistor or 100MF capacitor at IC1 or changing resistors and capacitors at IC1/2 for higher or lower tone. __ Designed by Andrew R. Morris

Two tone mixer IIP3 Notes -  As a measuring experimenter with a homebrew POV, I like to add new test equipment and procedures to my lab each year.  With digitally processed spectrum analyzers getting more able and relatively cheaper over time, I think a spectrum analyzer (with a built in tracking generator) might prove one of the best toys to consider buying.  As ever, a homebrew SA remains a valid option for more advanced builders. __ Contact: Vasily Ivanenko

Two Transistor Amplifier -  A 2 Watt audio amplifier made from discrete components.  This was one of the earliest circuits that I ever designed and built, in Spring 1982.  At that time I had only an analogue meter and a calculator to work with.  Although not perfect, this amplifier does have a wide frequency response, low harmonic distortion about 3%, __ Designed by Andy Collinson

Two Watt Amplifier -  An audio amplifier made from discrete components with 2 Watts audio power into an 8 ohm load.  Carlos has used this amplifier on his AM radio for many years. __ Designed by Carlos Feldman

Voltage Clamps for ultra-low-voltage apps -  Today's electronic systems oftenmade to simulate a low-power Zener shunt regulator, using two parallel-The precise, ultra-low gate threshold voltage is used to control the sharp, fast __ Advanced Linear Devices, Inc

Voltage Controlled Panner -  pans audio left and right __ Designed by G. Forrest Cook

Volume Control -  This digital volume control has no pot to wear out and introduces almost no noise in the circuit.  Instead, the volume is controlled by pressing UP and DOWN buttons.  This simple circuit would be a great touch to any home audio project. __ Designed by Aaron Cake

Volume Control -  A volume control using a linear pot that is much better than most log pots __ Designed by Rod Elliott  ESP

Volume Control has Log Taper -  04/11/02 EDN-Design Ideas Digital potentiometers provide a compact and convenient way to attenuate audio-amplifier signals.  However, most such potentiometers suffer from at least one flaw  a nonlogarithmic step increment.  To avoid this problem, a user must usually step the potentiometer in a nonlinear sequence to simulate a logarithmic taper__ Circuit Design by Doug Farrar, Los Altos, CA

Volume unit meter spans 60 DB dynamic range -  11/10/05 EDN-Design Ideas An audio volume-unit meter displays peak-related audio amplitudes to aid in accurately setting recording levels or for displaying an amplifier's operating conditions.  A simple diode and capacitor network provIdeas a classic volume-unit meter's peak-weighted response, but the circuit typically limits response to about 23 dB of displayable dynamic range, and the meter suffers from errors that its pointer's inertia and mechanical "ballistics" introduce.  Contemporary displays eliminate the inertia problem by using arrays of lighted elements to form bar graphs, but any shortcomings in response and accuracy characteristics now shift to the signal-processing domain.  __ Circuit Design by Jon Munson, Linear Technology Corp, Sunnyvale, CA

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Automatic Level Tone Balance:  #'s - A      B - H      I - R      S - Z


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