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30 Ddm to +30 Ddm Audio Level Meter - circuit with balanced input and
adjustable gain to drive needle type VU meter, uses special amplifier module from
Op-Amp Labs (added 4/02) |
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300 Watt Subwoofer Power Amplifier - (schematic added 9/02) |
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3-Way 12dB/ Octave Crossover - Contributed project, simple 12dB/ Octave
crossover network. (added 05/06/07) |
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48V Phantom Supply - Low noise 48V regulator and phantom mic supply
circuits. (added 05/06/07). |
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A DC-Coupled, Selectable-Gain Headphone Amplifier - This design uses two
opamp gain stages per channel for superior input buffering and a discrete bipolar
output stage with thermal tracking current mirrors. The amplifier's overall gain can
be adjusted to match the efficiency and impedance characteristic of any headphone. The
author provides detailed instructions for optimizing the....Designed by Chester
Simpson (Circuit design added 04/05/06) |
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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)
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A Reader's Xover - This is well worth reading if you can't decide on
biamping (added 6/07) |
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A Soundfield Simulator for Stereo Headphones - An adaptation of the Linkwitz
acoustic simulator (see An Acoustic Simulator for Headphone Amplifiers by Chu Moy
above) as a front-end for headphone amplifiers with very high input impedance, such as
the author's own headphone amp project (see A DC-Coupled, Selectable-Gain Headphone
Amplifier). This circuit features a continuously adjustable Soundfield control.
Designed by Chester Simpson (Circuit design added 04/05/06) |
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A-B Switch Box - Can you really hear the difference between amps or cables?
(circuit added 6/07) |
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ABX Comparator - Full ABX testing unit, without microcontrollers or a PC
(circuit added 6/07) |
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Active Subwoofer & Controller - (schematic added 9/02) |
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Add headphones to a Class D amplifier - 9-Jul-09 Issue of EDN Connect
headphones to the MAX9704 and make a quieter lab or office.... [Design Idea by Hiroshi
Fukushima, Technical Research Center, D&M Holdings Inc, Kawasaki City, Kanagawa,
Japan] |
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Add on Stereo Channel Selector - (electronic Circuit / Schematic added
10/04) |
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Amplificateurs audio - en Français (added 08/08/08) |
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Amplifier Phono Input as Line Level Input - (electronic schematic added
8/02) |
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Amplifier Thermal Protection - (schematic added 9/02) |
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An Equalization Circuit for the beyerdynamic DT990 Pro Headphones - This
passive EQ corrects a rising characteristic in the frequency response of the
beyerdynamic DT990 Pros and turns them into one of the most natural and accurate
sounding headphones on the market…. [Designed by LXH2] |
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AN215: CS4201/CS4202 Headphone Jack Sensing using GPIO - (app note added
6/07) |
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Analog Synth Keyboard Schematic - (electronic circuit added 2/07)
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Anti-RIAA Equalizer for Line to Mag Phono Converter - AS071 Jenson
Transformer Application Note (app note 6/07) |
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Arc welder sound simulator - (diagram added 2/07) |
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Audio Amp Output Power Limiter - (schematic added 9/02) |
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Audio Amp Timer - Turns-off your amplifier when idle for15 minutes Fed by
amplifier tape-output (added 9/04) |
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Audio Amplifier Output Relay Delay - This is a simple circuit which I built
to one of my audio amplifier projects to control speaker output relay. The
purpose of this circuit is to control relay which turns on speaker output
relay in audio amplifier. The idea of circuit is wait around 5 seconds
after power up until speakers are switched to amplifiers....
(added 11/05) |
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Audio Auto Shutoff - The purpose of this circuit is to automatically turn
off any device plugged into its power outlets after a certain period of time. Shutoff
is activated by an absences of an audio signal or by a standard timer function.
This unit would be connected to speaker terminals of a stereo system, tape outputs, TV
earphone jack or audio outputs etc. Once the audio signal drops below a predetermined
level a …. [Randy Linscott] |
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Audio Detector Circuit - (diagram added 2/07) |
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Audio Graphic Equaliser - Simple 7 band eqalizer (diagram added 2/07)
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Audio Level Meter - Audio levels can be monitored using a small panel meter
with this circuit built from discrete components. The circuit has a flat
frequency response from about 20Hz to well over 50Khz. Input sensitivity is 100mV for
a full scale deflection on a 100uA meter. Built on two common emitter amplifiers, the
first stage has a preset resistor which may be adjusted for a FSD. The last stage is
biased to operate at roughly half the supply voltage for maximum ac voltage swing.
Audio frequencies are passed through the 10u dc blocking capacitor and the full wave
bridge rectifier converts the signal to a varying dc voltage....(schematic design
added 01/2010) |
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Audio line isolator - (electronic circuit added 2/07) |
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Audio Line Isolator #1 - (electronic circuit added 1/03) |
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Audio Line Isolator #2 - (electronic schematic added 8/02) |
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Audio notch filer - (electronic circuit added 2/07) |
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Audio Peak Reading Meters - (circuit added 7/02) |
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Audio Signal Source - (diagram added 2/07) |
