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Amplifiers: Audio Circuits
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Audio Amplifiers:   #'s       A - D        E - M        N - R      S - U     
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Last Updated: December 07, 2017 02:03 PM

Circuits Designed by Dave Johnson, P.E. :
TV /VCR Remote Range Extender Circuit  -  I often get frustrated by how poor some infrared remotes in many new electronic devices operate.  I used to be able to turn on the TV from 30 feet away.  Now, it seems that I have to get within 15 feet.  To address this issue, I designed the circuit shown below.  The circuit taps into the TV remote’s existing infrared LED and drives 8 more efficient devices.  The result is a communications range some 4 to 5 times longer.   . . . Circuit by Dave Johnson P.E.-October 05, 2005

Video Signal Edge Enhancements  -  I designed this circuit many years ago, based on the claims that the technique would improve the quality of standard TV images.  The circuit adds information to the edges of the objects and was reported to bring out more detail.  After building and testing . . . Circuit by David A. Johnson P.E.-July 08, 2000

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

The Squirrel Monkey One Tube Guitar Amp -  tiny class-A tube practice amp __ Designed by G. Forrest Cook

The Studio Stacks -  Every lounge needs an ambisonic analogue synth studio. __ Designed by Henry 

The Technology of the Fuzz Face -  The Fuzz Face remains an enigma today, perhaps three decades after it first hit the market.  This simple, two transistor circuit remains for many the very definition of the guitar effects stomp pedal.  What makes such a simple circuit the stuff of legend? __ Designed by © 1999 R.G. Keen

The Wien Bridge Theremin -  A Theremin without Inductors

Theremin -  a simple version of a more complex designenables you to literally play tune by hand!! __ Contact: P. Townshend EduTek Ltd

Theremin controller -  Hand and body motions in proximity to the sensing antennas produce frequency changes in a Hartley oscillator operating at approximately 750kHz.  The signal from this variable oscillator is mixed with a constant reference frequency in a ring modulator and the result passed through a single pole of low pass filter to leave only the difference between the variable and reference oscillator frequencies.  The sensing circuitry is duplicated for Pitch and Volume sensor antennas. __ Designed by John Simonton

Theremin for Tube Enthusiasts by Craig Sellen -  Nearly everyone who has ever watched television or attended a motion picture has heard music and background effects produced by a Theremin, yet relatively few could recognize the instrument, and fewer still have had the chance to own or play one.  With its astounding tonal and dynamic ranges, it has been used to produce background music and special effects in scores of science-fiction, fantasy, horror, and mystery shows __ Designed by C. Sellen

Theremin with MC1496 -  Schematic only __ Designed by va3iul

Thermal Shutdown/ Protection -  The thermal protection of amplifiers is always a concern, since overheating is a sure way to reduce the life of semiconductors and other components.    Where you don't want to use a fan   (such as in Project 42Thermo-Fan for Amplifier Cooling), then a complete shutdown can be performed. __ Designed by Rod Elliott  ESP

Thermofan to Keep Your Amp Cool -  Use a 12V computer fan to cool your amp.    Uses diode temperature sensor f __ Designed by Rod Elliott  ESP

Thor -  The Thunderchief project, released in March 2004, was the first runoffgroove.com circuit that was developed using the tubes-to-FETs process.  Enlightened and inspired by Doug Hammond's excellent Meteor circuit, we used the same approach in an effort to capture some of the legendary magic of the Marshall Super Lead.  The circuit's performance pleased us, but there were issues. __ Contact: holler @ runoffgroove.Com

Three Channel Audio Mixer -  Above schematic is for a three channel audio mixer.  That will provide an overall gain of one between the output and each input channel.  Each input channel includes a single 0.1uf capacitor and 100-Kilohms resistor to provide an output impedance of 100K. __ Designed by YMYA electronics-IZHAR FAREED

Three Fake Alarms -  Battery Powered LED Circuits:  Flashing LEDs can be used to create the impression that an alarm has been fitted.  Or they can be used in conjunction with a real alarmto warn-off a potential thief.  These three small circuits will flash anything from a single LEDup to 90 LEDs and beyondwith a variety of speeds and patterns. __ Designed by Ron J.

Three Transistor Audio Amp 50 Milliwatt -  Here is a little audio Amplifier similar to what you might find in a small transistor radio __ Designed by Bill Bowden

Three-Level Audio Power Indicator -  This circuit is intended to indicate the power output level of any audio amplifier.  It is simple, portable, and displays three power levels that can be set to any desired value. __ Contact: Flavio Dellepiane, fladello @ tin.it

Three-Transistor Modulator-Amplifier Works with Swept-Control Frequencies -  22-April-10 EDN-Design Ideas Many applications require a circuit to perform pulse modulation and voltage amplification to drive a load with a train of impulses.  A typical application is driving a piezoelectric generator in a robot.  Other applications include driving small motors or LEDs.  Echolocation and ultrasound visualization use a sweeping-frequency, or chirp, signal. __ Circuit Design by Horia-Nicolai L Teodorescu and Victor Cojocaru, Gheorghe Asachi Technical University, Iasi, Romania

Timer Remembers Your Rhythm -  01/05/95 EDN-Design Ideas The unpretentious controller in Fig 1 remembers the interval between your pressing its start and stop buttons.  Thereafter, the controller switches the load on and off every day at the same times as you did.  You reset the controll __ Circuit Design by MS Nagaraj, ISRO Satellite Centre, Bangalore, Karnataka, India

Tiny Audio Amplifier using LM386 -  The Tiny Audio Amplifier kit is a good choice for battery operation.   It is based on LM386 IC. __ Designed by Rajkumar Sharma

Tips on the MP3 Player Kit -  The kit version of the MP3 player has been released.  This document is tips for building the MP3 player kit and modification hints. __ Designed by The Electronic Lives Manufacturing-presented Chan

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 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 display systE - M -  This device gives visual feedback of which note you're playing, so you can set up the note before bringing up the volume to sound it.  It features a 40-LED display, for over three octaves of range at any given time.  Furthermore, a three-position switch extends the range by two octaves, for a total usable range of over five octaves.  You'll be amazed at how quickly you'll pick out recognizable tunes with DIS*PLAYER's help. __ Designed by Fred Nachbaur

Tone Filters for Electronic Organs -  As the organ is a sustained-tone instrument, achieving a satisfactory imitation of the steady-state acoustic emission of organ pipes is of paramount importance. In this respect, the design of the tone-forming filters is crucial, yet there is a curious absence of definitive material dealing with filter design __ by  C E Pykett B Sc, Ph D

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

Tonemender -  The Tonemender is a very flexible, yet simple clean boost with a 3-knob tonestack that allows the user to re-create the classic Fender, Marshall and Vox responses.  We suggest using a TLC2272 for the dual op-amp.  The TLC2272 is rated for low-noise and rail-to-rail output, which will offer the highest possible clean boost and dynamic range.  The NE5532 is another good choice, but a TL072 can also be used with decent results __ Contact: holler @ runoffgroove.Com

Touch-Sensitive Musical Bell with Timer -  This circuit is built around CMOS IC CD4011 and popular melody generator IC UM66. When touch plates are bridged by hand for a moment. the circuit starts to generate music. After __   01/01/07EFY

Toy Organ -  Some useful circuits using the LM555 IC.  Scroll to find the toy organ circuit __ Designed by Jose Pino

Transformer Short Tester -  Transformer Short Tester __ Designed by Guitar Effect RC Keen

Transistor Amplifier Design -  Good stability and sufficient amplification in Transistor based circuits depends on the proper selection of components and their layout.  Gain of the transistor used as well as the current and voltage through it are the most important aspect in the working of a transistor amplifier.  Here explains the design parameters of an one __ Designed by D Mohankumar

Transistor Audio Amplifiers -  At a recent RASON meeting, I gave a presentation of how to design audio preamplifiers.  I thought it would be nice if we could now build some audio amplifiers to bring the output from these preamplifiers to levels which could drive a speaker.  I intentionally avoided the use of IC amplifiers to provide a real learning experience for audio amplifier design.  Although many IC amplifiers provide excellent performance at low cost, we need to learn the basics first.  I will address IC audio amplifiers in a future article. __ Designed by N1HFX

Transistor linearly digitizes airflow -  09/19/02 EDN-Design Ideas A sensitive and reliable way to measure airflow is to take advantage of the predictable relationship between heat dissipation and air speed.  The principle of thermal anemometry relies on King's Law, which dictates that the power required to maintain a fixed differential between the surface of a heated sensor and the ambient air temperature increases as the square root of air speed __ Circuit Design by Steve Woodward, University of North Carolina, Chapel Hill, NC

Transistor Organ -  This simple circuit can provide hours of enjoyment as you learn tunes, play duets or just make some really weird sounds by pushing all the buttons at once.  You have probably seen this circuit before, it is fairly common.  I have seen it in several __ Designed by Aaron Cake

Transmission Line Enclosure Speakers -  Built for my Ambisonic surround rig, and an interesting project.  But don't do this unless you're clinically insane; Buy them instead. __ Designed by Henry 

Transposable Chord Generator -  This circuit consists of three precise triangle-wave oscillators, each using an Analog Devices type AD654 voltage controlled oscillator (VCO) and an AD620 instrumentation amplifier (INAMP).  Each oscillator frequency (F1, F2, F3) is adjusted with a ten-turn potentiometer.  The three triangle waves are summed at U1B to produce a triad chord.  Transposition of the triad over a wide range is achieved by dividing each of the input voltages by a common factor, set by the TRANSPOSE potentiometer and buffered by U1A. __ Designed by Arthur Harrison

Treble Booster/Overdrive including a peRF board layout -  A stone cold crazy treble-boosted overdrive. __ Contact: holler @ runoffgroove.Com

Tremolo Effect for Electric Guitar or Other Musical Instruments -  Tremolo circuit is a kind of sound effect.  We can see this type of effect is applied  in guitar effect pedals.  Tremolo effect is produced if we modulate the amplitude of an audio signal.  The shape of modulating signal can vary from square wave, sawtooth, or sine.  When we use a square wave, then the effect produce a knocking-like sound which might be perceived like a percussive instrument.

Tremolo Unit -  A versatile guitar effect.  This is a simple circuit that gives very good results __ Designed by Rod Elliott  ESP

Tremolo Unit for Musicians -  Jazz up your music with this easy to build unit. __ SiliconChip

Triangle Wave Audio Astable -  a useful replacement for a sine wave generator, has ac/dc output and square and triangle outputs __ Contact: P. Townshend EduTek Ltd

Triple Spring Reverb -  A spring reverb unit using three high quality Accutronics spring tanks with different decay times and feedback controls. __ Designed by Henry 

Tri-Vibe -  A versatile modulation effect that offers true vibrato. __ Contact: holler @ runoffgroove.Com

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Audio Amplifiers:   #'s       A - D        E - M        N - R      S - U        V _ Z

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