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Audio Circuits:  Audio Accessories Page 1
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Last Updated on: Thursday, April 07, 2016 01:00 PM

Circuits Designed by Dave Johnson, P.E. :
  • 120VAC Touch Switch
    This is a capacitance based touch on/touch off switch, which can control power to a 200 watt 120vac load.  (added 12/04)

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

1 Transistor Theremin -  . . . 


1.5V Headphone Amplifier -  This circuit stabilizes the quiescent voltage across the speaker at the exact level necessary to get the desired maximum available volume at minimum battery draw. This more than doubles the battery life compared to just connecting a simple resistor between. . .  [Designed by Andrew R. Morris]


2 Line Output Combiner -  Convert consumer equipment stereo signal to mono or combine audio signal from two different equipments to1-input. . .  [Tomi Engdahl's web]


24 dB/Octave 2/3-Way Linkwitz-Riley electronic crossover -  Linkwitz-Riley alignment. This is a very nice crossover, Rev-B boards now available. . .  [Rod Elliott (ESP)]


2-Way Electronic Crossover -  Conventional 3rd order electronic crossover . . . 

2X12 W HiFi Amplifier circuit by TD2616 -  Here is the circuit of a 2X12 watt HiFi Amplifier circuit using IC TDA 2616 from Phillips. A quiet simple and robust circuit using very less components. This makes the circuit ideal for a portable power Amplifier. The circuit delivers 12 W power on 8 Ohm speaker for each channel at +/- 12 V dual supply. . .  [Designer's name not included]


3 Channel-Color Organ -  An old ideabut I've had numerous requests for a good design for this. . .  [G.L. Chemelec]


3 Level Audio Power Indicator -  Battery-operated3 LED display that connect it to loudspeaker output. . .  [Flavio Dellepiane's web site]


300 Watt Subwoofer Power Amplifier -  There are some important updates to this project, as shown below. Recent testing has shown that with the new ON Semi transistors it is possible to obtain a lot more power than previously. The original design was very conservative, and was initially intended to use 2SA1492 and 2SC3856 transistors (rated at 130W) - with 200W (or 230W) devices, some of the original comments and warnings have been amended to suit. . . .  [Rod Elliott (ESP)]


3-Way 12dB/ Octave Crossover -  Contributed project, simple 12dB/ Octave crossover network. . . .  [Rod Elliott (ESP)]


4 Channel, 12 Volt Color Organ for a car -  Back in the 1970's these were popular for use in homes and the colored bulbs were typically place in a box with a sheet of "rippled/bubbled" Plastic in front to break up the light patterns. Some units gave very impressive light patterns. . . .  [G.L. Chemelec]


48V Phantom Supply -  Low noise 48V regulator and phantom mic supply circuits. . .  [Rod Elliott (ESP)]


555-based class-D headphone driver makes great practice Amp -  07/28/14  EDN Design Idea   This class-D audio Amp “plays” to the 555’s strengths. Read More. . . . . .  [by Petre Petrov]


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 performance of the output stage. . . .  [Design by Chester Simpson ]


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. . .  [by R.G. Keen]


A Reader's Xover -  This is well worth reading if you can't decide on biamping. . . 


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 impedancesuch as the author's own headphone Amp project (see A DC-Coupled, Selectable-Gain Headphone Amplifier). This circuit features a continuously adjustable Soundfield control. . . .  [Design by Chester Simpson ]


A-B Switch Box -  Can you really hear the difference between Amps or cables? . . .  [Rod Elliott (ESP)]


ABX Comparator -  Full ABX testing unit, without microcontrollers or a PC . . .  [Rod Elliott (ESP)]


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