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TDA1013 4.2W Power Amplifier - The TDA1013 is an integrated audio amplifier
circuit with DC volume control, encapsulated in a 9-lead single in-line (SIL) plastic
package. The wide supply voltage range makes this circuit ideal for applications in
mains and battery-fed apparatus such as television receivers and record players. The
DC volume control stage has a logarithmic control characteristic with a range of more
than 80 dB; control is by means of a DC voltage variable between 2 and 6.5 V.
….(design added 11/08) |
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TDA2002 8W Car Radio Power Amplifier - TDA2002 8W Car Radio Power Amplifier with
10V-14V single rail voltage supply. Power output is 8W. Recommended for speakers with
2-8 ohm impedance. ….(design added 11/08) |
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TDA2006 12W Power Amplifier - 12W TDA2006 power audio amplifier with 11V to 14V
single voltage supply. For speakers with 2-8 ohm impedance. ….(design added 11/08) |
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TDA2030 8 Watt Amplifier - Although the TDA2030 can deliver 20 watts of output
power, I deliberately reduced the output power to about 8 watts to supply 10 watt
speakers. Input sensitivity is 200mV. Higher input levels naturally will give greater
output,…(added 07/07/07) |
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TDA2030-14W Single Chip Power Amplifier - There are many instances where a very
simple to build (and relatively cheap) power amplifier is needed. The TDA2030 is a
single chip amplifier capable of 14W output into 4 ohms with a few external
components.It can be used for almost any application you could think of...(design
added 07/07/07). |
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TDA7294 Amplifier - The TDA7294 amplifier module is a monolithic integrated
circuit. It is intended for use as an audio class AB amplifier in hi-fi applications.
It has a wide voltage range and output current capability, enabling it to supply the
highest power into both 4 ohm and 8n ohm loads. With the addition of a handful of
parts and a suitable power supply, this module will deliver 50W RMS into 8-ohm with
0.1% THD. ….(electronic schematic added 11/08) |
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The 6N1P OTL Headphone Amplifier - This version of the optimized Morgan Jones
headphone amplifier uses 6N1P dual triode tubes and a standard power supply. The
author provides extensive construction details. Includes simulation files for use with
OrCAD Lite software. Designed by Bruce Bender (circuit design added 01/08) |
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The Alexander Current-Feedback Audio Power Amplifier - AN-211 Analog Devices
Application Notes (app note added 2/06) |
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The Audio/ Video Distribution Amplifier - With the amount of equipment in home
entertainment centers today the need to be able to vary the gain of the audio or video
signal is needed. I found this particular circuit helpful when used in conjunction
with the Universal Descrambler and a Stabilizer circuit I built for making copies of
video tapes....(electronic schematic / circuit added 05/05/05) |
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The Big-E Stereo Parabolic Microphone - This device is a stereo amplifier for a
high sensitivity stereo parabolic microphone. It can be used for listening to distant
sounds. Typical parabolic microphones are monophonic, this unit has a stereo audio
path that helps produce more realistic sounding audio. The Big-E can be used with
headphones or as an audio source for a stereo tape recorder.... (added 10/05) |
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The DPA 220 schematic - ….(electronic schematic added 03/08) |
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The DPA 440 schematic - ….(electronic schematic added 03/08) |
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The DPA 880 schematic - ….(design added 03/08) |
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The Emperor's New Amplifier - I spent much of 1997 designing and building my
ultimate dream amplifier, which I named "The Emperor's New Amplifier"TM (TENA) for a
quality it shares with the fabled emperor's wardrobe-- transparency. It was also an
oblique reference to the marketing hype that pollutes high-end audio. I thought about
commercializing it, especially when the lab where I worked announced it was shutting
down, but I soon realized that marketing high-end tube amplifiers is not a reliable
(design added 004/02/02) |
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The Kumisa III Headphone Amplifier - A discrete all-bipolar, zero feedback class A
amplifier with a new opamp-based servo. The servo operates outside the audio feedback
loop by controlling a pair of current mirrors at the input stage. Designed by Benny
Jørgensen (circuit design added 01/08) |
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The Leach Amp - One amplifier builder found that the 2N5416 PNP transistors that
he purchased were NPN. I have tested them and verified this. Two of the transistors
are shown in the linked photo. They are identified by the letters ON surrounded by a
circle, signifying they are products of ON Semiconductor. You can check...(added
07/07/07) |
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The Miller Effect - ...(spice design added 02/09) |
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The Miller Integrator - ...(spice design added 02/09) |
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The Morgan Jones Mini Tube Headphone Amplifier - This reverse-engineered version
of the famous EarMax headphone amplifier has just 3 tubes, uses no global feedback,
and is powered from an 19VAC wall-wart. Includes two additional versions of this
amplifier optimized for driving low impedance headphones and simulation files for use
with OrCAD Lite software. Designed by Chu Moy (circuit design added 01/08) |
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The SESS Tube Headphone Amplifier - The author describes the construction of a
very simple single-ended, single-stage, single-tube (SESS) tube headphone amplifier
with a reference power supply that uses a tube rectifier in a hybrid Graetz bridge
configuration. Designed by Andrea Ciuffoli (circuit design added 01/08) |
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The Technology of the Fuzz Face - The Fuzz Face remains an enigma today, perhaps
three decades after it first hit the market. This simple, two transistor circuit
remains for many the very definition of the guitar effects stomp pedal. What makes
such a simple circuit the stuff of legend?....(circuit design added 04/05/06) |
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The Zen Headphone Amplifier - A single-ended, class A MOSFET headphone amplifier
with an active current source that results in increased efficiency (50%) and lower
distortion. The active current source is based on a patented design featured in the
Aleph power amplifiers from Pass Laboratories. Designed by Marcello Pellerano
(circuit design added 03/08) |
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Theory & Construction of MIC Splitters - (electronic schematic / circuit added
4/02) |
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Thermofan to Keep Your Amp Cool - (diagram added 6/03) |
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Three Band Equalizer - (electronic Circuit diagram added 03/03/03) |
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Three Transistor Audio Amp 50 Milliwatt - Here is a little audio amplifier similar
to what you might find in a small transistor radio. (added 4/02) |
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Tiny audio Amplifier using LM386 - ….(electronic schematic added 08/08) |
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Tips on the MP3 Player Kit - The kit version of the MP3 player has been released.
This document is tips for building the MP3 player kit and modification hints. (added
10/05) |
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Tone Control (Andy Collinson) - Based on the classic Baxendall tone control
circuit, this provides a maximum cut and boost of around 10dB at 10K and 50Hz. As the
controls are passive, the last transistor provides a slight boost. The output….(added
07/07/07) |
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Top-Level OTL Tube Headphone Amplifier - This article shows my tube headphone
amplifier designs for driving headphones with an impedance of 200 to 600 ohms (I am
using these amplifiers with the Sennheiser 580, which has a 300-ohm impedance). The
problem with many tube headphone amplifiers ....(circuit design added 07/06) |
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Transistor Organ (Aaron Cake) - 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 (added 04/03/02) |
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Tube active crossover - (diagram added 2/07) |
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Tube Amplifier Kit - The amplifier kit uses two 11MS8 tubes per channel. The two
DC blocking capacitors and the four coupling capacitors are metallized polyester,
while Samsung aluminum electrolytic capacitors are used to filter the solid-state
power supply. ….(design added 11/08) |
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Tube Headphone Amplifier/Preamp with Relay-Based Input & Power Switching - A tube
headphone amplifier inspired by the "Top-Level" and "No-Compromise" amps of Andrea
Ciuffoli, except that the output stage uses a triode-connected pentode. Because this
amp also serves as a preamp, the author has put in a sophisticated relay-based
switching system (both input source selection and power supply). T....Designed by
Helmut Ahammer (circuit design added 08/08/08) |
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Tube Line Driver/Preamp - Published in Glass Audio #2/1993 (circuit design added
08/08/08) |
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Two channel audio Amplifier drives stepper motor - 12/01/06 EDN-Design Ideas:
Pulse-width-modulated stereo power amplifier saves components.....(design idea added
05/06/07) |
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Two Transistor Amplifier (Andy Collinson) - This was one of the earliest circuits
that I ever designed and built, in Spring 1982. At that time I had only an analogue
meter and a calculator to work with. Although not perfect, this amplifier does have a
wide frequency response, low harmonic distortion about 1.5%, and is....(electronic
circuit added 1/03) |
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Two Transistors Audio Amplifier - (electronic design added 6/07) |
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Two Watt Amplifier - Low distortion amplifier using discrete components (added
5/02) |
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Two way cross-over 3500 Hz - ….(design added 08/08) |
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Two Wire Remote Microphone Amplifie - uses special amplifier module from Op-Amp
Labs (added 4/02) |
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Two-channel audio Amplifier drives stepper motor - 12/01/06 EDN- design Ideas:
Pulse-width-modulated stereo power amplifier saves components.....(design idea added
05/06/07) |
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Two-Tone Train Horn - With this circuit you can electronically simulate the noise
of a diesel-train horn. The sound is triggered automatically as the train reaches a
desired place on the track so you can produce the sound as the train approaches
stations, level crossings, etc. The circuit can be built simply by using one 556 or
two 555 timers. The rest of the parts are readily available and not critical. The
output...(Tony van Roon's schematic / circuit added 2/07) |
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Two-Transistor Audio Amplifier - A simple two-stage amplifier. Use any
general-purpose NPN with high gain. It will drive low impedance headphones directly. A
speaker will probably require further boost…(added 05/05/05) |
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Ultra Low Noise Low Dropout Regulator Achieves 6 Nv/√Hz Noise Floor - 06/23/05 EDN-Design
Ideas: LDO has ultralow-noise output.....(design idea added 10/05) |
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Ultra-Low Noise Low Distortion Audio Op Amp - Linear Technology LT1115 (app note
added 02/05) |
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Ultra-Low Quiescent Current AF Power Amplifier - This is an audio power amplifier,
similar to what is common in transistor radios and other portable audio equipment.
This circuit however, has an ultra-low quiescent current of about 250uA, due to a
unique bias circuit. I don’t even know of a chip that does that. This circuit also has
much higher open-loop gain, due ....Designed by Andrew R. Morris (added 09/05) |
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Universal Preamplifier - ….(design added 08/08) |
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Updated 60-100W Hi-Fi Power Amplifier - ….(electronic schematic added 03/08) |
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Urei 527 Equalizer Schematic - (electronic schematic / circuit added 9/06) |
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Urei 533 Equalizer Schematic - (schematic / circuit added 9/06) |
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Urei 537 Equalizer Schematic - (schematic / circuit added 9/06) |
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Urei 545 Parametric Equalizer Schematic - (schematic added 9/06) |
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Urei LA 2A Schematic - (schematic added 9/06) |
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Urei LA 3A Schematic - (electronic circuit added 9/06) |
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Urei LA 4, this is the black faced LA4, uses 846 op amps Schematic - (electronic
circuit added 9/06) |
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Urei LA 4A, silver LA-4, uses all 4136 op amps Schematic - (electronic circuit
added 9/06) |
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USB Sound Card with PCM2702 - Make a sound card is no more a complex issue. If you
use great IC PCM2702 from BURR BROWN / Texas Instruments you can create a fully
functional USB sound card. This sound card can be…(added 08/08/08) |
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Use Amplifier Phono Input as Line Level Input: Inverse RIAA Filter - 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 ....(added 11/05) |
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Using Split Supplies-MP7720-DN0001 - Monolithic Power Systems, Inc Design Note
(added 3/06) |
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Using the Analog Devices Active Filter Design Tool - AN-649 Analog Devices
Application Notes (app note added 2/06) |
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Using the SSM2167 Evaluation Board - AN-583 Analog Devices Application Notes (app
note added 2/06) This document explains how the evaluation board is set up and how to
use it to evaluate the SSM-2167. |
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Using your Op-Amp Circuit in the real world - Almost all active (semi-conductor or
tube based) audio units add some degree of DC voltage bias. What this means is that
the audio signal can have positive or negative voltage bias, this is something that
can cause large distortion errors,....(added 08/08/08) |
