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Audio Circuits: Power Amplifiers
Page 3
Audio
Circuits -- Main Page
Audio Power Amplifiers: #
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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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HeadBanger Headphone Amp Construction Kit - 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.... [By Stephen H.
Lafferty] |
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Headphone Amplifier - An amplifier to drive low to medium
impedance headphones built using discrete components…. [Andy
Collison's design] |
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Headphone Amplifier redcircuits - (circuit added 9/04)
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Heathkit W3AM - (circuit added 11/06) |
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Heating System Thermostat - Controlled by indoor and outdoor
temperature. Simple, high reliability design. (circuit added 9/04)
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HI FI Headphone Amplifier - (schematic / Circuit design added
9/02) |
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HI FI PreAmplifier - (schematic / Circuit design added 9/02) |
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Hi-Fi Headphone Amp - Contributed by a reader, this is a very nice circuit (circuit
added 2/07) |
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High Current Regulated Power Supply - The high current regulator below uses an
additional winding or a separate transformer to supply power for the LM317 regulator so
that the pass transistors can operate closer to saturation and improve efficiency. For
good efficiency the voltage at the collectors of the two parallel 2N3055 pass transistors
should be close to the output voltage. The LM317 requires a couple extra volts on the
input side, plus the emitter/base drop of the 3055s, plus whatever is lost across the (0.1
ohm) equalizing resistors (1volt at 10 amps), so a separate transformer and
rectifier/filter circuit is used that is a few volts higher than the output voltage...
[Bill Bowden's circuit] |
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High Performance Audio Applications of the LM833 - RIAA Phono preamplifier stages and
active crossover ne2-rks (app note added 3/03) |
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Interfacing 5 Volt CMOS to 12 Volt loads - The circuit above is designed to be used
with the bi-directional lamp sequencer shown above on this same page. Two additional
transistors are used to increase the current from the 74HCT138 decoder to control 12 volt
25 watt lamps. A 6.8 volt/1 watt zener diode is used in series with the ground connection
of all the CMOS ICs (74HC14, CD4516 and 74HC138s) so that the total voltage across the
CMOS devices will be about 5.2 volts and the outputs will move from +12 to about +7 when
selected. The 2N2905/PNP transistor stage is connected as an emitter follower which
provides a high impedance to the... [Bill Bowden's circuit] |
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Isolates & Converts Speaker Drive to Line Level - AS068 Jenson Transformer
Application Note (app note 11/02) |
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JT-115K-E Cascode Tube Microphone Input Stage - AS054 Jenson Transformer Application
Note (app note 6/07) |
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JT-115K-E Tube Microphone Preamp Generic Input Stage - AS020 Jenson Transformer
Application Note (app note 6/07) |
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JT-13K6-C in Simple One IC Stage Mic Preamp - AS017 Jenson Transformer Application
Note (app note 04/03/02) |
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JT-16-A in Single Stage Low-Noise IC Mic Preamp - AS018 Jenson Transformer
Application Note (app note 6/07) |
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JT-16-A in Single Stage Mic Preamp with Two DC Servos - AS019 Jenson Transformer
Application Note (app note 6/07) |
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JT-346-AX as Ribbon Mic Matching Transformer - AS067 Jenson Transformer Application
Note (app note 6/07) |
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JT-MB-D Converts 600 Ohm Unbalanced Mic to 150 Ohm Balanced Mic Line - AS049 Jenson
Transformer Application Note (app note 11/02) |
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JT-MB-D Passive Stereo Matrix for M-S Mic Technique - AS055 Jenson Transformer
Application Note (app note 11/02) |
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Leach Amp 120 Watt Power Amplifier - Latest update of the "Low Tim Amplifier",
Claimed to be a very good sounding design (added 4/02) |
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Leach Superamp - 270-Watt Double Barreled Amplifier published in Audio magazine
(added 4/02) |
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LF071 Mic Amplifier - A high quality microphone preamplifier using a single power
supply, suitable for dynamic or electret microphones. The op-amp used can be any low
noise, high performance type, e.g. NE5534,TL071, OPA 371 etc [Designer, Andy Collison] |
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LM1876-Overture Audio Power Amplifier Series Dual 20-Watt Audio Power Amplifier with Mute
& Standby Modes - The LM1876 is a stereo audio amplifier capable of delivering
typically 20W per channel of continuous average output power into a 4 or 8 load with less
than 0.1% THD+N.….(added 05/08) |
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LM317 Regulator With Pass Transistor - The LM317T output current can be increased by
using an additional power transistor to share a portion of the total current. The amount
of current sharing is established with a resistor placed in series with the 317 input and
a resistor placed in series with the emitter of the pass transistor. In the figure below,
the pass transistor will start conducting when the LM317 current reaches about 1 amp, due
to the voltage drop across the 0.7 ohm resistor.... [Bill Bowden] |
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LM317 Variable Voltage Regulator - The LM317T is a adjustable 3 terminal positive
voltage regulator capable of supplying in excess of 1.5 amps over an output range of 1.25
to 37 volts. The device also has built in current limiting and thermal shutdown which
makes it essentially blow-out proof.... [Bill Bowden design this one] |
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LM380 Power Audio Amplifier - National Semiconductor Application Note (app note
added 2/06) |
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Low Noise Balanced Microphone Preamp - A discrete front end makes this balanced
microphone preamp very quiet, and it has excellent noise rejection. Since the SSM2017 has
been discontinued (sad but true), and if you can't get the INA217 this may be the ideal
replacement…(added 4/02) |
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Low Noise version of High Level Output Stage in 1031 - AS033 Jenson Transformer
Application Note (app note 11/02) |
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Low Power Audio Amplifier Based on LM386 - Another super-simple circuit. You could
use this circuit to drive a low power speaker from a sound effects module or a noise
generator. Or you could build your own amplified speakers for use with your computer….
[from Bill's Electronics Reference Library] |
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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....(diagram added 6/03) |
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Medium Wave Active Antenna - This circuit is designed to amplify the input from a
telescopic whip antenna. The preamplifier is designed to cover the medium waveband from
about 550Khz to 1650Khz. The tuning voltage is supplieb via RV2, a 10k potentiometer
connected to the 12 Volt power supply.... [Circuit : David Sayles] |
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Microphone Phantom Power Supply - (electronic circuit added 7/03) |
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Mini Amplifier with LM386 - The LM386 is a low voltage audio power amplifier, simple
and easy to build a mini amplifier with only a few components. (7/03/2006) |
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Mini Bench Amplifier - This mini audio amplifier will test the audio stages in
amplifiers such as the front end of FM bugs. You can also use it on lots of our other
projects as well as the output stages of radios. It is a very handy piece of test
equipment and will make a perfect addition to your collection....(electronic circuit added
4/05) |
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Mini Portable Guitar Amplifier - Can be fitted into a packet of cigarettes. Also
suitable as Fuzz-box (added 3/05) |
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MOSFET Power Amp - DIY high power MOSFET amplifier200 Wrms 8 ohms -350 Wrms4 ohms
(added 4/02) |
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Ms Stereo Decoder - (electronic circuit added 7/03) |
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Ms Stereo Microphone - (electronic circuit added 7/03) |
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One Watt 2.3 GHz RF Amplifier using a Mrf2001 - (diagram added 6/03) |
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One Watt 2.45 GHz Linear Amplifier - (electronic circuit added 4/05) |
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Op-Amp Microphone Preamplifier - A high quality microphone preamplifier using a
single power supply, suitable for dynamic or electret microphones. The opamp used can be
any low noise, high performance type, e.g. NE5534,TL071, OPA 371 etc…. [Andy Collison's
Design] |
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Overture Audio Power Amplifier Series Dual 20-Watt Audio Power Amplifier with Mute &
Standby Modes - The LM1876 is a stereo audio amplifier capable of delivering
typically 20W per channel of continuous average output power into a 4 or 8 load with less
than 0.1% THD+N.….(added 05/08) |
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Audio Power Amplifiers: #
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