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Amplifiers: Audio Circuits
Amplifier -- Main Page          Audio Amplifiers Circuits -- Main Page

Audio Amplifiers:   #'s       A - D        E - M        N - R      S - U     
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Last Updated: October 24, 2017 02:54 PM

Circuits Designed by Dave Johnson, P.E. :
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, 2000


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


Warbler siren -  This circuit provides a good siren noise suitable for warding off robot-predators! Change the pitch by adjusting R2, and R5 __ Designed by Andy Wilson

Wave Multiplier for music synthesizers -  The idea for this project came from the fabled middle section of the Serge wave multipliers.  At the time I designed this, I had never seen or heard one of these units, nor had I seen its schematic diagrams, but armed with descriptions and suppositions by various people who had seen them, and a couple of photos of CRO traces from the output of the module, I decided to design myself one. __ Designed by Ken Stone

Weighting Filter for Audio Measurements -  For noise measurements.  Ideal for use with the AC Millivoltmeter above __ Designed by Rod Elliott  ESP

Whistling Kettle -  Most electric kettles do not produce a whistle and just switch off when they have boiled.  Fitting a box of electronics directly onto an electric kettle (or even inside!) to detect when the kettle has boiled is obviously out of the question.  The circuit shown here detects when the kettle switches off, which virtually all kettles do when the water has boiled. __ Designed by Bart Trepak© Elektor

White / LF noise generator -  Every musician today is in need of a noise source, particularly those who practice with a group or use a synthesizer.  The white noise generator gives an output to be fed to an amplifier.  The white noise generated by the 12V zener diode is amplified 200 times along with the noise of the noisy 741 IC (IC1).  The output is thus very noisy with plenty of white noise.

Why do we need Mixer? -  Article:  The mixing of a number of audio signals is such a common thing to do that one would expect the Net to be riddled with articles on how and why signals are mixed.  There are plenty of circuits that show how it can be done, but very little that explains the benefits or drawbacks of any particular scheme. __ Designed by Rod Elliott  ESP

WidgyBox-A Guitar Distortion Effects Unit -  Plug into to those great guitar sounds with this unit.It's cheap, easy to build and can be run from a 9V battery or pugpack supply. __ SiliconChip

Wien-bridge Theremin -  This circuit is a basic theremin with only a pitch control.  It uses the "heterodyne" technique, as did Theremin's original instrument.  Heterodyning is advantageous in its simplicity, and is made further attractive in this Design by eliminating the coils that are usually hard to find (electronic design 10/05) __ Designed by Arthur Harrison

Wind Sound Generator -  Using this simple circuit, one can generate the sound of wind.  The circuit is basically an astable multivibrator build around two NPN transistors.

Wireless guitar transmitter -  Schematic only

Wireless PA for Classrooms -  In large classrooms, many a times the teacherís voice is not audible to students in the back rows.  So the teacher have to literally shout to be heard by every student. __ Electronics Projects for You

Wurlitzer Jukebox repaired with digital MP3/WAV file player & auduino -  This cool old jukebox from Wurlitzer is owned by my dad, its 100% all mecanic brain from 1965 is worn out many years ago,
it is very complicated and time consuming to make it run stable for just a few days before a new problem show up,
So the perfect fix is to skip the mecanics, use all buttons and credit indicator as it is, and make it all digital, __ Designed by Thomas Scherrer OZ2CPU

Yet Another Headphone Amplifier -  Pure Class-A Single-ended circuitry;  500mW into 32 Ohms __ Contact: Flavio Dellepiane, fladello @ tin.it

Yet Another Mobile MP3 Player -  This is an earlier player using a conventional PC motherboard, so the power supply I designed is quite compatible. __ Designed by Bob Blick

Zonk Machine & Treble Booster -  Thanks to A.  Coleman for lending his original Hornby-Skewes Zonk Machine for tracing.  This is another of those obscure distortions that were designed in the early years of electronic distortion for guitars.  Itís not YAFF (Yet Another Fuzz Face) circuit, and itís probably more interesting for that.  Thanks also to ďamscrayĒ for providing the schemo for the Hornby-Skewes Treble Booster, which is purportedly the preferred front end for this __ Designed by R.G. Keen

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