|
DC Fault Protection Circuit for Audio Amplifiers - Circuit ideas how to replace
traditional CD protection relays with MOSFETs (added 4/02) |
|
DC-Coupled, Selectable-Gain Headphone Amplifier - This headphone amplifier
features selectable gain for compatibility with different headphone impedances (and
efficiencies). It has two gain stages. The first design I considered had only one gain
stage, but I modified it because feeding a gain stage from a high source impedance
(such as a high value pot) adds ..... Designed by Chester Simpson (circuit design
added 04/05/06) |
|
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 .... (diagram added 2/07) |
|
Design makes handy audible circuit 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 (adden 02/05) |
|
Digital Delay Unit For Surround Sound - The Mitsubishi M65830 Digital 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 .... (diagram added 2/07) |
|
Digital Projector - Intersil Application Block Diagram (app note added 6/06) |
|
Digital volume control (Aaron Cake) - (circuit diagram added 1/07) |
|
Dimmer Control Polarity changer - Convert old dimmer units using a 0 to -10V
control signal (added 6/07) |
|
Direct Injection Box for Recording & Psystems - passive and active DI-box designs
(added 4/02) |
|
Direct Injection DI Box - An essential companion for the mixer for stage or
recording work (schematic added 6/07) |
|
Distortion Analyser - A simple distortion meter you can use with an oscilloscope
or millivoltmeter (electronic circuit added 7/03) |
|
DIY Electrostatic Headphones - Electrostatic headphone built in the enclosure of
an old pair of dynamic headphones. The author gives detailed instructions for
constructing the electrostatic transducers and a high voltage amplifier from PA
transformers. Designed by Andrew Radford (circuit design added 04/05/06) |
|
DIY Electrostatic Loudspeaker Part 1 - An ESL using ready made panels available
exclusively from ESP. Part 1 (schematic added 6/07) |
|
DIY Electrostatic Loudspeaker Part 2 - ESL cabinet details. Part 2 (schematic
added 6/07) |
|
DIY Electrostatic Loudspeaker Part 3 - ESL Transformers and Power Amplifier
Details. Part 3 (schematic added 6/07) |
|
Doorphone Intercom - (circuit / design added 8/03) |
|
DoZ Headphone Amplifier - The DoZ is ideally suited to headphone use. Revision-A
boards now shipping (circuit added 6/07) |
|
Dual +/-25V Lab Supply - Up to 800mA (typical) output current at +/-25V. |
|
Dual Power Supply - A power supply that is adaptable for most power amps
(schematic added 6/07) |
|
Dual Voltage Controlled Filter with Modulator - (schematic / circuit added 2/07) |
|
Dual Voltage Controlled Oscillator w/Modulator - (schematic diagram added 2/07) |
|
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. |
|
DVD Recorder - Intersil Application Block Diagram (app note added 6/06) |
|
Dynamic microphone to electret microphone input - Circuit which works as an
preamplifier which allows you to replace an electret microphone with a dynamic
microphone…..(circuit diagram added 2/07) |
|
El-Cheapo - This is the real El-Cheapo, presented in more or less original form.
A Really Simple Power Amplifier. (schematic added 6/07) |
|
Electret Microphone Powering - (circuit added 2/07) |
|
Electronic Police Siren - The sound produced imitates the rise and fall of an
American police siren. When first switched on the 10u capacitors is discharged and
both transistors...(electronic design added 08/08/08) |
|
ESP SIM Sound Impairment Monitor - a method of determining just how much your
amplifier modifies the original signal (added 4/02) |
|
Fast Audio Peak Limiter - This peak limiter is simple and very effective. Uses
discrete FET gain control (schematic / circuit design added 9/02) |
|
FET audio mixer (Aaron Cake) - This simple circuit mixes two or more channels into
one channel (eg. stereo into mono)….(electronic circuit added 05/06/07) |
|
FXBus-an Effects Experimenter's Delight! - Like to build guitar effects? Want a
cleaner way to experiment than perfboarding each new one? You'll love FXBus.….(circuit
design added 04/05/06) |
|
GainClone Amplifier 1 - The amp is based on the Project 19 PCB, so uses a pair of
LM3876 (or LM3886) power opamps, run from a ±35V supply. I used a cut-down P88 preamp
PCB because I only wanted one preamplifier stage, but the entire board can also be
used. Alternatively,….(added 07/07/07) |
|
Guitar Amplifier - ….(design added 08/08) |
|
Guitar Effect Circuit (ee.washington.edu) - (electronic schematic / circuit added
4/02) |
|
Guitar Effect Circuit (Aaron Cake) - Wah, Fuzz and sustain (added 04/03/02) |
|
Guitar Reverb Circuit - (electronic circuit added 4/05) |
|
Guitar Reverb Effect Version 2 - (diagram added 2/07) |
|
Guitar Reverb Pedal - (schematic / circuit design added 9/02) |
|
Guitar Tremolo Unit - (circuit added 7/02) |
|
Guitar Vibrato Unit 1 - (schematic / circuit design added 9/02) |
