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Audio Circuits:  Audio Accessories
Amplifier -- Main Page          Audio Circuits -- Main Page

Audio Accessories:   #-A       B - D       E - H       I - P        R - S       T - Z

 

Last Updated: October 13, 2017 03:03 AM


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

Balanced Line Driver & Receiver -  Use these to eliminate hum for long signal leads __ Designed by Rod Elliott  ESP

Balanced Low Noise Microphone Preamp -  A discrete front end makes this balanced microphone preamp very quiet __ Designed by Rod Elliott  ESP

Bass Beat Extractor -  an automatic gain control circuit followed by a low pass filter, converts  beat into a sharp pulse suitable for triggering  strobe or chaser __ Designed by Rod Elliott  ESP

Bluetooth Headset Hack -  DIY streaming stereo project. __ Contact: Jameco Electronics

Build a Stereo Headphone Amplifier -  It's based on a single IC and can be used with RIAA   (turntable) preamp described in our March 2002 issue   (or anything else)__ SiliconChip

Build a Tape Linearizer & a Distortion Analyzer -  No sane recording engineer would ever add distortion to a program intentionallyunless, of course, the goal was to increase headroom and lower tape distortion.  No, I'm not talking about a new type of "sonic exciter," but a well-known and accepted method to counteract the onset of saturation in analog recording tape.  Unlike amplifiers or other electronic circuits for which the clipping threshold is well defined, analog tape distortion creeps up slowly, minimizing dynamic range and blurring transients. __ Designed by Ethan Winer

Build a Theremin for a Really Eerie Sound -  You wave your hands around mysteriously to play it.__ SiliconChip

Build an Optical Theremin -  Make music hands free! __ Contact: Jameco Electronics

CD ROM Drive as Digital Audio CD Player -  This circuit converts CD ROM drive in computers into a standalone audio CD player by just connecting power supply options to CD ROM and interconnecting it to either a tape deck or an audio amplifier. __ Designed by M.P.VERMA

Cheap Audio Booster -  Circuit only, no description given __ Designed by YMYA electronics-IZHAR FAREED

Circuit Routes Audio Signals Between Equipment -  7-Jan-10 EDN-Design Ideas Analog devices let you switch audio channels with no signal loss __ Circuit Design by Roger Khourey, Los Angeles, CA

CMoy Headphone Amplifier -  CMoy is very simple portable headphone amplifier.  The amplifier was originally posted by Chu Moy on headwize.  com.  The best source of information about this amplifier is article How to Build the CMoy Pocket Amplifier.  If you use Google, you will find many pages and pictures about CMoy.  Few months ago I decided built this amplifier also.  In my post you can find my experience with creating this simple but very good amplifier.

CMoy pocket headphone Amplifier -  Chu Moy designed a very popular headphone amplifier thatís easy to build, and it can be built small enough to fit in a pocket, power supply and all.  Itís powerful enough to drive very inefficient headphones to thunderous volumes from even weak sources, and it sounds excellent considering that you can build a bare-bones CMoy amp for just US$20, and a pretty nice amp for under $50.  Considering that the cheapest of the worthy commercial amps is $100 and most of them are in the $200+ range, this is a very worthwhile cost difference. __ Designed by contact me 2014 @ tangentsoft.com

Color Organ -  This is a simple, one lamp colour organ.  It is far less complicated then the Three Channel Colour Organ.  It is simply a lamp controlled by an SCR.  It can be built in a few minutes, and combined with other circuits to make some pretty neat effects. __ Designed by Aaron Cake

Color Organ -  PIC Project  This unit uses a PIC16F84 with an 8 bit A/D.    The signal from both stereo channels is combined and digitized.    Each of 5 frequency bands is processed using a 16 point FFT.    Then the level of each channel is output as PWM (pulse width modulation) to a set of solid state relays __ Designed by Luhan MonatMesa Arizona

Colour (Sound) Organ -  This is a simple, one lamp colour organ.  It is far less complicated then the Three Channel Colour Organ.  It is simply a lamp controlled by an SCR.  It can be built in a few minutes, and combined with other circuits to make some pretty neat effects. __ Designed by Aaron Cake

Connect Line-Level Signal to Phono Input  -  The circuit does two functions: signal level attenuation and inverse RIAA filtering.  The signal attenuation is needed to convert the 500 mV signal to 2.5 mV signal.  The inverse-RIAA filtering is needed to make the frequency response of the system flat (same equalization that is used when music is transferred to vinyl in the studio).  The picture blow shows the frequency response of the ideal inverse-RIAA filter __ Designed by Tomi Engdahl

Connecting Speaker Signals to Line Level Inputs -  The circuit is designed to work with typical HIFI amplifiers where negative speaker connector (black) is connected to amplifier ground.  Be careful here because some modern amps have both terminals actively driven.  Connecting either one to a common reference could cause the output stage to smoke __ Designed by Tomi Engdahl

DC Fault Protection for Audio Amplifiers -  Circuit ideas how to replace traditional CD protection relays with MOSFETs __ Designed by R.G. Keen

DC Hi Amp. LoA - D -  for powersupply testing __ Designed by Thomas Scherrer OZ2CPU

Delay Unit for Surround Sound -  The Mitsubishi M65830 Delay IC has been discontinued (for reasons beyond my comprehension) , and so far a suitable replacement device has not been found.  This means (of course) that you will be unable to build this delay circuit.  I have left the project in place as reference, and the overall connection schematic is still valid if (when?) a replacement for the M65830 is located.  The project will be updated at that time.  In the meantime, just ignore the delay circuit __ Designed by Rod Elliott  ESP

Design Makes Handy Audible Tracer -  01/09/03 EDN-Design Ideas The circuit tracer in Figure 1 is a handy tool for finding connectivity paths on a pc board.  Because the sense voltage you use to measure the path is lower than a transistor's VBE voltage, you can use the design in circuits containing semiconductor elements without affecting the measurement.  The tracer's output takes the form of audio tones __ Circuit Design by Jerry O'Keefe, Cupertino, CA

Digital Delay Unit for Surround Sound -  The Mitsubishi M65830 Delay IC has been discontinued (for reasons beyond my comprehension) , and so far a suitable replacement device has not been found.  This means (of course) that you will be unable to build this delay circuit.  I have left the project in place as reference, and the overall connection schematic is still valid if (when?) a replacement for the M65830 is located.  The project will be updated at that time.  In the meantime, just ignore the delay circuit __ Designed by Rod Elliott  ESP

Digital volume control -  Circuit of a digital volume control using six discrete ICs, including a 5V regulator, is presented.  IC1 (555) is configured to function as astable flip-flop.  Its frequency or period may be adjusted by proper choice of resistors R44, R45 and capacitor C6 combination.  Here it is for 0.3 second period __ Contact: IQ Technologies

Dimmer Control Polarity changer -  Convert old dimmer units using a 0 to -10V control signal __ Designed by Rod Elliott  ESP

Direct Injection Box for Recording & Psystems -  An essential companion for the mixer for stage or recording work __ Designed by Rod Elliott  ESP

Distortion Analyser -  A simple distortion meter you can use with an oscilloscope or millivoltmeter __ Designed by Rod Elliott  ESP

DIY Electrostatic Loudspeaker Part 1 -  An ESL using ready made panels available exclusively from ESP.  Part 1 __ Designed by Rod Elliott  ESP

DIY Electrostatic Loudspeaker Part 2 -  ESL cabinet details.  Part 2 __ Designed by Rod Elliott  ESP

DIY Electrostatic Loudspeaker Part 3 -  ESL Transformers and Power Amplifier Details.  Part 3 __ Designed by Rod Elliott  ESP

Door Phone Intercom -  A simple 2 way Intercom based on the LM386386 using 8 ohm speakers __ Designed by Laurier Gendron & Andy Collison

DoZ Headphone Amplifier -  The DoZ is ideally suited to headphone use.  Revision-A boards now shipping __ Designed by Rod Elliott  ESP

Dual +/-25V LAB Supply -  Up to 800mA (typical) output current at +/-25V. __ Designed by Rod Elliott  ESP

Dual Power Supply -  A power supply that is adaptable for most power amps __ Designed by Rod Elliott  ESP

Dual Voltage Controlled Filter with Modulator -  Schematic only, no circuit description __ Designed by John Simonton

Dual Voltage Controlled Oscillator w/Modulator -  Schematic only, no circuit description __ Designed by John Simonton

Dummy Head Recording Microphone -  Complete details on how to construct a dummy head recording mic.  Using either P93 or (surprisingly perhaps) P88 as the mic preamp, the performance is something to surprise you.  You will never know just how good a dummy head recording can be until you try it yourself. __ Designed by Rod Elliott  ESP

Dynamic microphone to electret microphone input -  Circuit which works as an preamplifier which allows you to replace an electret microphone with a dynamic microphone. __ Designed by Tomi Engdahl


Audio Accessories:   #-A       B - D       E - H       I - P        R - S       T - Z
 


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