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Audio
Circuits: Audio Accessories Page 3
Amplifier -- Main Page
Audio Circuits -- Main Page
Audio Accessories:
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Last Updated on:
Monday, October 03, 2011 06:07 PM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Hand Clap Electronic Control - We have all seen the commercial on
TV.... CLAP, ON, CLAP, OFF, THE, CLAPPER.... well here is a circuit that
will perform that same function… [Randy Linscott] |
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Hand clap lamp control - Hand Clap Lamp/Appliance Control - Clap
once for ON and twice for OFF I think [Reverse engineered schematic by
Stepan Novotill] |
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Headphone Adaptor - A simple adaptor to provide a headphone output
to an existing power amplifier (schematic added 6/07) |
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Headphone Amplifier - High Quality unit. No need for a
preamplifier. (electronic circuit added 06/07/08) |
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Headphone Amplifier circuitdb - Both halves of the circuit
are identical. Both inputs have a dc path to ground via the input
47k control which should be a dual log type potentiometer. The
balance control is a single 47k linear potentiometer, which at
center adjustment prevents even attenuation to both left and right
input signals. If the balance control is moved towards the left
side, the left input track has less resistance than the right
track and the left channel is reduced more than the right side and
vice versa.... (added 05/07) |
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Headphone Amplifier connact - (circuit / schematic design
added 6/06) |
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Headphone Amplifier headphone - An amplifier to drive low to
medium impedance headphones built using discrete components.
(added 6/06) |
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Headphone Amplifier redcircuits - (circuit / schematic design
added 6/06) |
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Headphone driving circuit for soundcards - Computer
soundcards typically have line level and speaker level outputs.
Neither of those is usually nott very suitable for driving
headphones: If you connect the headphones to the line level output
you will usally loose tha bass frequencies because of small
coupling capacitors. Line output circuitry might be overloaded
because of too low input impedance and this can cause
distortion....(electronic circuit added 2/07) |
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Headphone Monitor Amp - (circuit / schematic design added 6/06) |
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Headphone Monitor Switch - For use in field recording. Has provisions for stereo,
left-only mono, right-only mono, left+right mono and even left-right reversed. Designed
by Rudy Trubitt (Circuit design added 04/05/06) |
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hFE Tester - An hFE tester with switched collector currents for the Device Under
Test (schematic added 6/07) |
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Hi-Fi Headphone Amp - The intention is to permanently insert the headphone amp
between pre and power amps, although it can be used as a stand-alone item. The input relay
is operated by auxiliary contacts on the headphone sockets through a transistor driver
(with a small delay) so as to mute the power amp input when listening on headphones.
(circuit / schematic design added 6/06) |
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High Quality Intercom (Andy Collison) - A very high quality intercom, which may also
be used for room monitoring….(electronic design added 10/06) |
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High-Resolution Volume Unit Meter Simplifies CD Recording - 06/21/01 EDN-Design
Ideas Digitally recorded music on CDs offers superior quality to that recorded on vinyl
records or tape, but most prerecorded CDs have an annoying characteristic The average
volume levels of the recorded signal can vary by as much as 14 dB from disk to....--
[Chester Simpson, National Semiconductor, Santa Clara, CA] EDN migrating links. This link
is not verified. Google the "title" EDN for new link. |
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Home Theater - this unit is designed to interface: TV sound, videotape sound, and 5.1
dvd sound to a 4 channel home theater system….(electronic schematic added 08/08)) [Luhan
Monat - Mesa Arizona] |
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Home Theater Receiver - Intersil Application Block Diagram (app note added 6/06)
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How To Remagnetize Old Headphones - The magnets in old-style high impedance
headphones can gradually lose their potency resulting in diminished output volume. The
authors describe two methods for restoring de-magnetized headphones. Designed by Tom
Provost and Gary D'Amico (Circuit design added 04/05/06) |
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Infrared cordless Headphone Amplifier - (schematic added 09/08) [Site is
underconstruction right now] |
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Infrared Head Phones - Using this low-cost project one can reproduce audio from TV
without disturbing others. It does not use any wire connection between TV and headphones.
In place of a pair of wires, it uses invisible infrared light to transmit audio signals
from TV to headphones. Without using any lens, a range of up to 6 metres is possible.
Range can be extended.... (added 5/02) |
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Infrared Theremin Musical Instrument - (electronic Circuit diagram added 03/03/03)
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Light Organ for Car - flashes3 low voltage Light, operates at10-25-Volt voltage, in
PDF format, text in Finnish (added 4/02) |
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Line level Signal to microphone input adapter - Sometimes there is need to convert
line level signals to such signal that it can be connected to microphone input. Because
the line level signals are typically in range of 0.5..2V and the microphone signals are in
millivolt range, quite much attenuation is needed to match the signal levels. This means
that typically you will need 40-50 dB of attenuation. (added 2/06) |
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Linkwitz Cosine Burst Generator - part of speaker measurement set described in the
construction article (added 04/03/02) |
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Linkwitz Transform Circuit - The Linkwitz Transform circuit, an equaliser to provide
extended bass response (circuit added 6/07) |
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LM358 preamp - Another very simple audio preamp to build. all parts should be
available at your very local electronics shop…. |
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Load Sensing Automatic Switch - apply power to the entire audio system by turning
on1-item, simple circuit (electronic circuit added 2/07) |
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Loud Speaker Protection & Muting - Protect speakers from turn-on and turn-off
transients and amplifier faults (schematic / Circuit design added 9/02) |
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Loudspeaker Test Box - Quickly and accurately determine the optimal impedance
correction network (circuit added 6/07) |
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Low Frequency Sine Wave Generator - The two circuits below illustrate generating low
frequency sine waves by shifting the phase of the signal through an RC network so that
oscillation occurs where the total phase shift is360 degrees. (added 5/02) |
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Low Noise Balanced Microphone Preamp - A discrete front end makes this balanced
microphone preamp very quiet (diagram added 1/07) |
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Low Noise Microphone PreAmplifier - Simple unbalanced design, suitable for
microphones, very low noise (diagram added 2/07) |
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Low Power Op-Amp-Audio Amp Intercom - The example below illustrates using an op-amp
as an audio amplifier for a simple intercom. A small 8 ohm speaker is used as a microphone
which is coupled to the op-amp input through a 0.1uF capacitor. The speaker is sensitive
to low frequencies and the small value capacitor serves to attenuate the lower tones and
produce a better overall response. You can experiment with different value capacitors to
improve the response for various speakers. The op-amp voltage gain is determined by the
ratio of the feedback resistor to the series input resistor which is around one thousand
in this case.... (electronic circuit added 7/03) |
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Magnetic Cartridge Amplifier - (electronic circuit added 7/03) |
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Make Cordless Headphones - Build these inexpensive cordless headphones using a pair
of Radio Shack FM transceivers (the techniques are adaptable to other brands and models).
These are mono headphones (for use with a metal detector), but the author has added
instructions for quality stereo cordless phones. Designed by Dan Clark (Circuit design
added 01/08) |
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Making Differential Probes - For sensing audio signal voltages across devices that
are not ground referenced (added 4/02) |
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Making Your Own HeadBanger - After the euphoria over receiving my new Sony Minidisc
bundle had partially subsided, I noticed that the portable unit, the MZ-E40, has a rather
weak output. Measurements showed that it can only manage 80mV rms output and only about
74dB SPL output from the phones. This is when recording at average level with 8dB of
headroom. In contrast, an orchestra....(circuit / schematic design added 6/06)
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Measuring the Effective Impedance & Sensitivity of Headphones - The author describes
the construction and use of a FILVORA (Fixed Insertion Loss Variable Output Resistance
Attenuator) and DFILVORA (Dual Fixed Insertion Loss Variable Output Resistance Attenuator)
for measuring the impedance and sensitivity of headphones, including modern stereo
headphones, magnetic headsets and piezo-electric ceramic headsets. Designed by Ben H.
Tongue (Circuit design added 03/08) |
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Microphone Circuit Test Oscillator - This unit would be mounted in a small plastic or
preferably metal box, with a 9V battery, level control, a male XLR connector (same as on a
mic) and a switch. Current drain is low, since the circuit only uses one dual opamp.
There is no need for a high quality device, and a 1458 is all that is needed....(schematic
/ circuit added 2/07) |
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Microphone from a Speaker - A circuit to Impedance Match a Speakeras a Mike.
Speakers can make a Good Microphone for some applications. Bigger Speakers may also have
a Good Low Frequency Response. Ever seen a 15 Inch Microphonethis Circuit will do
it....(design added 12/08) |
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Microphone Mixer - Designed for 3-dynamic microphones...This relatively simple mixer
was designed for three dynamic microphones, but can be re-designed for more or less. Level
and tone controls are available to tailor the sound to your needs…. [Anatoly I. Shikhatov
is the designer] |
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Microphone phantom power supply - (diagram added 2/07) |
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Midibox 64 - (electronic circuit added 4/05) |
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MIDITester - (electronic schematic added 8/02) |
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Mini-Box 2 Watt Amplifier - This amplifier was designed to be self-contained in a
small loudspeaker box. It can be feed by Walkman, Mini-Disc, iPod and CD players,
computers and similar devices fitted with line or headphone output. Of course, in most
cases you will have to make two boxes to obtain stereo.... |
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Minimalist Discrete Hi-Fi Preamp - (electronic circuit added 2/07) |
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Minimum Theremin Kit Schematic - (schematic / circuit added 2/07) |
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Mixed Feedback Drive for Audio Output Transformers - Using feedback eliminates
transformer distortion and primary resistance (added 4/02) |
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Modifying the Sennheiser HD500 Headphones - The author details modifications for the
HD500 headphones that correct their bright and "phased" sound. The result is an extended
frequency response and better dynamic range that make these headphones among the "best
headphones on the planet." Designed by Charles Miller (Circuit design added 03/08)
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MP3 Jukebox - In December 1999, at a computer flea market, I found a neat looking
remote control along with a small receiver pod that looked like it would plug into a 9-pin
serial port and a Windows driver disk. Immediately I realized that this was the key to
getting a computer feed MP3 music to my stereo without having ugly and nerdy looking PC
display and input devices in the living room.... [Designed by Markus Wandel] |
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MP3 Player (intersil) - Intersil Application Block Diagram (app note added 6/06)
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MS Stereo Decoder - (schematic / circuit added 2/07) |
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MS Stereo Microphone - (diagram added 2/07) |
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Notes on DIY Electrostatic Headphones - The principles of electrostatic headphone
design and a study of the DIY projects by J.P. Wilson, Philip Harvey and Neil Pollock from
a series of Wireless World articles published between 1968 and 1979. For advanced DIYers
experienced with high-voltage construction....Designed by Chu Moy (Circuit design added
01/08) |
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One Transistor Theremin - (electronic schematic added 8/02) |
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Optical Theremin-electronic musical - (circuit added 6/07) |
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Audio Accessories: #-B
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