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Amplifiers: Audio Circuits  Page 6
Amplifier -- Main Page          Audio Circuits -- Main Page
Audio Amplifiers:  #'s       A-G        H-L      M-O       P-S      T-U       V-Z
Last Updated on: Friday, October 03, 2014 10:36 AM


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

A 2SK1058 MOS-FET Amplifier- Want to construct an amp that had zero negative feed back(0NFB), was pure Class A and definitely single ended(added 04/04/04)…

A 50mW Class-A Headphone Amplifier- The gain of this voltage-feedback design can be set by changing the values of two resistors. The authors presents versions optimized for low and high impedance headphones as well as one that performs well with a wide range of loads.… [Design by Rohit Balkishan ]

A 50mW Class-A Headphone Amplifier- The gain of this voltage-feedback design can be set by changing the values of two resistors. The authors presents versions optimized for low and high impedance headphones as well as one that performs well with a wide range of loads.… [Design by Rohit Balkishan ]

A Collection of Amp Applications- AN-106 Analog Devices Application Notes   Examines Some of  Numerous and Widely Used Applications of  Operational Amplifier…

A Current-Domain Electrostatic Amplifier for Stax Omega II Headphones- Designed and built for the author's Stax Omega II headphones, this amplifier can be used with other Stax models. It is fully DC-coupled, uses inexpensive semiconductors and operates primarily in the current domain for best speed and extended frequency response.… [Design by Kevin Gilmore ]

A DC-Coupled Tube Amplifier With Futterman Output Stage for Dynamic Headphones- The Futterman output stage in this tube amp offers the choice of DC- and AC-coupled outputs. The class AB design can output up to 24mW into a 30-Ohm load or nearly 500mW into a 600-Ohm load.… [Design by Rudy van Stratum ]

A Digitally Programmable Gain & Attenuation Amplifier Design- AN-137 Analog Devices Application Notes  …

A Fender-Tone Tube Headphone Amplifier- This tube amplifier with sonic controls has a paralleled White cathode follower output stage for driving low impedance headphones. The sonic controls consist of a Fender tone stack(bass, mid and treble), and ambience and blend controls. Includes simulation files for use with OrCAD Lite software.… [Design by Alex Cavalli ]

A Fender-Tone Tube Headphone Amplifier- This tube amplifier with sonic controls has a paralleled White cathode follower output stage for driving low impedance headphones. The sonic controls consist of a Fender tone stack(bass, mid and treble), and ambience and blend controls. Includes simulation files for use with OrCAD Lite software.… [Design by Alex Cavalli ]

A Gainclone for the PC Age- Audio input comes from either the Line-Out of the PC or an external sound card(described later). A small filter consisting of 680Ω/47pF excludes any RF signals from entering the case. 470nF input capacitor should have a high voltage rating since it protects against line voltages being connected to the amplifier, since it is in the signal path it should be a high quality type(circuit added 07/08/09)  designed by Malcolm Rix…

A Good IR Detector- Some of the companies put two transmitters, one on each side of the detector, to get a good field of coverage for the front of the 'bot and to detect left and right. 'Robots, Inspiration to Implementation has a great schematic that you can use to build one of these. I used all Radio Shack parts for the one I made and it cost about $10 to build.  This detector will NOT detect black flower pots nor the bottom of boots(grin)…

A HiFi Preamp- The PGA2310 is a pretty neat chip. It's capable of attenuating a stereo source over a 127dB range(-95.5dB to +31.5dB) with 0.5dB steps. It has a maximum gain error of +/-0.05dB, and THD of 0.0004% at 1KHz. The sweet spot between THD and noise appears to be between 3V RMS and about 8V RMS…

A JFET-MOSFET Headphone Driver- This amplifier is based on the MOSFET headphone driver by Greg Szekeres. It has a JFET impedance buffer front-end and a choke-input power supply. The sound characteristic of the amplifier can be tuned by adjusting the low pass filter formed with the input capacitance of the MOSFET.… [Design by Richard Murdey ]

A Low-Voltage Class-A Tube Headphone Amplifier- This OTL design features a high-voltage power supply that is less than half of the one used in the author's first amp and most other tube amps, but without compromising performance.… [Design by Helmut Ahammer ]

A Musical Distortion Primer- This is an introduction to the basic means of distorting a signal in a musically useful way. The approach is as non-technical as possible.  I use the simplest signal waveform, a sine wave, to illustrate all these, although a guitar is much more like a sawtooth than a sine wave. The clipped waveforms will be shown in their raw state(Circuit design added 04/05/06)…

A Non-Complementary Audio Noise Reduction System- National Semiconductor Application Note…

A Pocket Headphone Amplifier- A simple yet high performance design using two Burr-Brown OPA132 FET input opamps. This project is ideal as a booster for power-conserving stereo sources such as portable CD players and for interfacing with passive EQ networks such as tone controls or a headphone acoustic simulator. It is powered by a single 9V battery configured as a virtually-grounded dual supply and is small enough to fit in a shirt pocket. Now includes a balanced input and audio limiter option for turning the pocket amp into a personal monitor.… [Design by Chu Moy ]

A Pure Class A Dynamic Headphone Amplifier- A high-current output amplifier for low-impedance dynamic headphones such as the Grados. The amplifier features an new servo biasing circuit which operates entirely outside the audio feedback loop. The author includes a balanced-bridge version of the amp for headphones that are wired in dual-mono as well as instructions for converting a Grado SR80 to dual-mono operation. The bridged amp will output 4 times the power of the standard amp.… [Design by Kevin Gilmore ]

A Simple Capacitance Multiplier Power Supply For Class-A Amplifiers- A basic circuit is provided in the article, but it is assumed that the builder knows all the pitfalls. The supplied schematic is in fact for a capacitance multiplier filter(not a regulator), but is somewhat lacking(I feel) and can be improved dramatically…

A Single-Ended OTL Amplifier for Dynamic Headphones- A simple OTL design that uses just two tubes(dual triodes) for stereo. It has a common cathode input stage direct-coupled to a cathode follower output stage.… [Design by Aren van Waarde ]

A SRPP-Input Tube Amplifier For Headphones & Loudspeakers- This transformer-coupled design uses a series regulated push-pull input stage and a parallel-triode cathode bias output stage. The audio output transformer is hand-wound from a kit. The amp will drive both headphones and speakers.… [Design by Tony Frazer ]

A Tube Headphone Amplifier/Preamp with Relay-Based Input and Power Switching- A tube headphone amplifier inspired by the "Top-Level" and "No-Compromise" amps of Andrea Ciuffoli, except that the output stage uses a triode-connected pentode. Because this amp also serves as a preamp, the author has put in a sophisticated relay-based switching system(both input source selection and power supply). The power supplies also feature slow-on and stepped delayed turn-on. The power-on LED doubles as a warm-up status indicator.… [Design by Helmut Ahammer ]

A Tube Headphone Amplifier/Preamp with Relay-Based Input and Power Switching- A tube headphone amplifier inspired by the "Top-Level" and "No-Compromise" amps of Andrea Ciuffoli, except that the output stage uses a triode-connected pentode. Because this amp also serves as a preamp, the author has put in a sophisticated relay-based switching system(both input source selection and power supply). The power supplies also feature slow-on and stepped delayed turn-on. The power-on LED doubles as a warm-up status indicator.… [Design by Helmut Ahammer ]

A Weighting Filter for Audio Measurements- For noise measurements. Ideal for use with the AC Millivoltmeter above  …

A Zero-Feedback SRPP-Input Headphone Amplifier- Features a series regulated push-pull input stage and transformer-coupled output stage with an output impedance of about 2.5 ohms. It has zero global feedback for open, natural sound without any harshness.… [Design by Simon Busbridge ]

 

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