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Negative Air Ioniser With Rotating Ion Thrust Emitters - A fun
way to show that an air ioniser is really working, using a
self-propelled spinning emitter. (electronic circuit added : 08/08/08)
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Nine Volt Battery Eliminator - for guitar pedals, radios etc
[G. Forrest Cook] |
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No-CA3080 Guitar Compressor - The TDA7052A is a readily
available amplifier chip (Farnell # 526198) that has a DC controlled
volume input. Here, the IC is used as the variable gain amplifier in a
guitar compressor, so the effect can be accomplished without the hard to
obtain CA3080 operational transconductance amplifier (OTA). Note that
the suffix-less TDA7052 does not have DC volume control.….must register
on this site.... [Published in Elecktor July/August 2010] |
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Not Just Another Headphone Amp (Guitar Practice) - A
battery-powered musician's practice and monitoring amplifier. Based on
the classic LM386 low voltage power amplifier, it is compact and sturdy
with excellent sound, and has optional equalization for use with
guitars. Designed by Alan Gary Campbell (Circuit design
added 01/08) |
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Octave Screamer - Note that the octave module consists of only five
parts – input capacitor, transformer, two germanium diodes, and an output volume
pot. The logical extension of this idea would be to add a DPDT switch so the
signal could be routed to either the octave circuit or the TS tone controls. Each
path ends with a volume control and the switch.... |
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On/off buffer switches analog or digital signals - 30-Mar-06 Issue of
EDN Use an op amp and a dual SPST to switch signals under digital
control.... [Design Idea by Liviu Pascu, Kepco, Flushing, NY; Edited by Brad
Thompson and Fran Granville] |
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One Transistor Theremin - (electronic schematic / circuit added 4/02)
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Optical Theremin-electronic musical - (circuit added 6/07) |
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Optoinsulated MIDI cable - (electronic design added 6/07) |
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Oscillator or Joystick Controlled Ambisonic Pan-Rotate - A system that
rotates mono or B-format soundstage signals by joystick control or spins them
continually with an oscillator. Also creates some attractive lissajous curves as a
fortunate by-product. (electronic circuit added : 08/08/08) |
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Phone Hold with Music - This circuit will allow you to place a phone
call on hold and if you wish to have them listen to music while they are on hold.
The circuit operates as follows: The RED wire from the phone jack is typically
positive and the GREEN wire is negative or ground….(electronic schematic / circuit
added 4/02) |
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Piezo Pickup Amplifier Circuit - AS098 Jenson Transformer Application
Note (app note 6/07) |
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Pira CZ Compressor/Limiter/Clipper for FM broADCasting - Audio signals
as music or speech have big dynamic ranges. There are silent and loud sections.
These audio signals aren't too good for a transmitter, which requires audio signal
with constant level on the input. Limiter is a device,….... |
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Pocket Headphone Amplifier - This is a Chu Moy headphone amp I made. I
got the PCB design from Guzzler from Head-Fi and the original design is very
popular and is here. I changed Guzzler's layout so I could use a Taiwan Alpha pot
on the PCB. These pots a high quality (some say better than ALPS blue velvet) and
are available from Jaycar. You can see the thread here. I also made a DIY Brown
dog adapter so I could use two OPA627 single opamps in a dual opamp socket.
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Portable CD Player Adapter for Car (Aaron Cake) - Whenever I'm in the
car listening to my favourite CD, it always happens-my batteries go dead. To solve
that problem, I built this extremely simple regulator circuit. It steps down the
12V from the lighter socket to 9V which is used by the CD player....(electronic
circuit added 4/05) |
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Portable DAC with Headphone Amplifier - This portable DAC can improve
the sound from portable devices, such as PCDPs, and other digital gear that has a
TOSLINK optical or coax digital output. It features the Burr-Brown DIR1703
receiver and the Analog AD1866 DAC ICs for digital conversion and a high-quality
multi-loop headphoneDesigned by Andrija Ifkovic (Circuit design added 01/08)
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PracticeManTM - An experimental device intended to be used as a
self-contained musican's tool. Has built-in clean, and overdriven preamps,
three-band, active tone control, and auxiliary outputs to feed your standard amp.
(Circuit design added 7/06) |
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PreAmplifier for Microphone or Guitar Use - suitable for guitar or
microphone use. (added 6/06) |
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Precision Metronome & Pitch generator - Precision Frequency generator 1
to 999 Hz. Precision Metronome 1 to 999 beats per minute (added 3/05)
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Radio Glen Transmitter - Not in use any more but ran for a few years.
Worthy of note for the synthesiser, modulator and especially the audio processing.
(electronic circuit added : 08/08/08) |
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Remote-Operated Musical Bell - .... |
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Rev 1 Guitar Reverb Circuit - old design, obsolete [G. Forrest Cook] |
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Rev 2 Guitar Reverb Circuit - much improved design [G. Forrest Cook] |
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Serial Port to MIDI Synthesizer Interface Cable - (circuit / schematic
design added 1/07) |
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Set your lights to music - 6-Aug-09 Issue of EDNThis circuit activates
six ac outlets according in a logarithmic thermometer-code format, causing six to
12 strings of lights to flash on and off according to the level and tempo of music
you are playing.... [Design Idea by Hanif Saeed, Maxim Integrated Products, Inc,
Sunnyvale, CA] |
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Silent Metronome - Files contains several circuits: LED flasher, silent
metronome, low battery indicator, high voltage generator.... |
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Simple Bass Guitar Compressor - An ultra simple compressor, ideally
suited for bass guitar. .... |
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Simple Color Organ - A simple, satisfactory Color Organ can be built
with a handful of cheap components. This design features: no mains supply
transformer, built-in microphone and three widely adjustable frequency bands
obtained by means of very simple, passive filters for Bass, Middle and Treble....
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Simple Timer Remembers your Rhythm - 01/05/95 EDN-Design Ideas.... EDN
is migrating links. This link is not verified. Search the "title" + "EDN" for
new link. |
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Song #Display - .... |
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Spartacus AO-44 Guitar Slave Amp - small push-pull tube amp [G. Forrest
Cook] |
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Spreadsheet converts sound levels - 12-May-05 Issue of EDN
Calculate sound level versus source distance.... [Design Idea by Dan O'Brien,
Mallory Sonalert Products Inc, Indianapolis, IN; Edited by Brad Thompson] |
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Spring Reverb - (electronic circuit added 4/05) |
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Spring Reverb Unit for Guitar - (electronic circuit added 4/05)
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Standard Musical Instrument or Synthesizer Direct Box - AS007 Jenson
Transformer Application Note (app note 6/07) |
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Stereo Audio Isolator - This circuit is useful for removing ground loop
hum on a remote line level audio signal line. It can be used to to connect a
computer sound card to a stereo amplifier's line input. Other uses include tapping
into a line level signal for powering a remote amplifier, and removing common mode
ground interference on 12 Volt audio equipment such as a car stereo. The circuit
can be used in mono applications by simply ignoring the second
channel....(electronic design added 6/07) |
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Studio Switcher - Made for Radio Glen at Southampton University, and
still in use at the re-named low power AM and web broadcasting station SURGE:
Southampton University Radio from Glen Eyre. Triumph of relay based logic, or
unnecessarily retro?....(electronic circuit added : 08/08/08) |
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Superheterodyne Mediumwave AM Radio - You can learn an awful lot of
things you never knew, by actually building something that is relatively
commonplace. (electronic circuit added : 08/08/08) |
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The Squirrel Monkey One Tube Guitar Amp - tiny class-A tube practice amp
[G. Forrest Cook] |
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The Studio Stacks - Every lounge needs an ambisonic analogue synth
studio. Colin and Justin are soooo wrong. (electronic circuit added : 08/08/08)
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Thoughts & Processes Relating To Recording & Mixing With Headphones -
How to make final mixes in headphones so that they sound accurate on a variety of
playback systems. The advantages to mixing in headphones are many, but can result
in mixes with poor sound when played back over loudspeakers, if not done
correctly. The author gives tips and techniques for successful mixing in
headphones....Designed by LXH2 (Circuit design added 01/08) |
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Timer Remembers Your Rhythm - 01/05/95 EDN-Design Ideas.... EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for new
link. |
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Toy Organ - Some useful circuits using the LM555 IC. Scroll to find the
toy organ circuit (11/06) |
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Transistor linearly digitizes airflow - 19-Sep-02 Issue of EDN 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.... [Design Idea
by Steve Woodward, University of North Carolina, Chapel Hill, NC] |
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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] |
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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 ciruit before, it is fairly
common. I have seen it in several books. The best thing about the circuit is that
you can tune each individual note, or go to a whole new octive by changing one
capacitor (C1). Because of this, it is possible to from an entire Transistor Organ
ensemble. Why you would want to do this is anyone's guess....(added 05/06)
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Tremolo Unit - A versatile guitar effect. This is a simple circuit
that gives very good results.... |
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Triple Spring Reverb - A spring reverb unit using three high quality
Accutronics spring tanks with different decay times and feedback controls.
(electronic circuit added : 08/08/08) |
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Twin Line Telebalance Unit - Again, made for Radio Glen. Quote from then
station manager Lex, "Beats the living fish out of those analogue Sonifex units."
(electronic circuit added : 08/08/08) |
