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Amplifiers: Audio Circuits
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Audio Circuits -- Main Page
Audio Amplifiers:
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Last Updated on:
Monday, October 03, 2011 06:08 PM |
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Links to electronic circuits, electronic
schematics, designs for engineers, hobbyists, students & inventors:
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5 Band Graphic Equalizer using a Single IC/Chip - This circuit uses a
single chip, IC BA3812L for realizing a 5 band graphic equalizer for use in
hi-fi audio systems. BA3812L is a five-point graphic equalizer that has
all required functions integrated onto one IC. IC is comprised of
five tone control circuits and input and output buffer Amplifiers.…. (added
10/05) |
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5 Watt Class-A Audio Amplifier - In the old valve days, most
commercial audio amplifiers suited for compact integrated mono or stereo record
players used a one-valve amplifier topology. The circuit was usually implemented
by means of a multiple type valve, e.g. a triode pentode ECL86. Common features
for those amplifiers were: Class A operation, output power in the 3, 5W range,
input sensitivity of about 600mV for full output power, THD of about 3% @ 3W and
1KHz. Best types showed THD figures of 1.8% @ 3W and 0.8% @ 2W. This
solid-state push-pull single-ended Class A circuit is capable of providing a
sound comparable to those valve amplifiers, delivering more output power (6.9W
measured across a 8 Ohm loudspeaker cabinet load), less THD, higher input
sensitivity and better linearity. ….(Circuit design added 11/08) |
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50 Watt Amplifier - Easy to build general purpose 50 watt amp.... (added
7/02) |
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50mW Class-Headphone Amplifier - The gain of this voltage-feedback design
can be set by changing the values of two resistors. The authors presents versions
optimized for low and high impedance headphones as well as one that performs well
with a wide range of loads. Designed by Rohit Balkishan (schematic added
03/04/05) |
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50W Power Amplifier - This simple audio power amplifier was
originally designed for a circuit board workshop, conducted by the OSU IEEE
Student Group. At the workshop, 20 participants each constructed this
amplifier, by etching and drilling the single sided circuit board, soldering
all components, ….(Circuit design added 11/08) |
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55W (Originally 75W) Power Amplifier - ….(design added 03/08)
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5-Band Graphic Equalizer - ….(design added 08/08) [Site is under
construction right now] |
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600W Audio Amplifier - ….(electronic schematic added 08/08) [Site is
under construction right now] |
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60W Bass Amplifier - This design adopts a well established circuit
topology for the power amplifier, using a single-rail supply of about 60V and
capacitor-coupling for the speaker(s). The advantages for a guitar amplifier
are the very simple circuitry, even for comparatively high power outputs, and
a certain built-in degree of loudspeaker protection, due to capacitor C8,
preventing the voltage supply to be conveyed into loudspeakers in case of
output transistors' failure.….(design added 11/08) |
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60W MOSFET Amplifier - To celebrate the hundredth design posted to this
website, and to fulfil the requests of many correspondents wanting an amplifier more
powerful than the 25W MosFet, a 60, 90W High Quality power amplifier design is
presented here. Circuit topology…(design added 04/05/06) |
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60W Power Amplifier - This paper gives a practical example of the design
of an off-line switching power supply. Factors governing the choice of a
discontinuous flyback topology are discussed. The design uses a pulsed-width
modulation (PWM) control scheme implemented with a Unitrode UC3840 IC....(circuit
added 04/05/06) |
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60W Power Amplifier (Jacint Chapo) - This is a simple and low cost 60W
power amplifier. The optimal supply voltage is around 50V, but this amp can work
from 30 to 60V. The maximum input voltage is around 0.8, 1V. As you can see, in this
design the components have a big tolerance, so you can build it with almost any
components that you can find at home. The output power transistors can be any NPN
types, but do not use Darlington types. ….(design added 11/08) |
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70W Class AB Hi-Fi Amplifier - This project considers the development of a
70W Hi-Fi Power Amplifier for use as part of a Hi-Fi separates music system. The
design is a fairly simple circuit topology, which is easy to understand and the
author believes that the finished result sounds very nice indeed. The web posting is
developed from an original design document available in pdf below. The detailed
design issues are discussed in the pdf, while this posting discusses the more
practical issues involved in producing the amp. ….(Circuit design added 11/08)
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78 RPM & RIAA Phono Equaliser - Multi Standard 78 RPM and RIAA Phono
Equaliser handles all "standards" (added 6/07) |
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8 Channel Passive Summing Busses - balanced and unbalanced input designs
(Circuit design added 08/08/08) |
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8 Channel Summing Buss with Level, Pan, & Master controls - (electronic
circuit added 08/08/08) |
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8 Watt Amplifier - (circuit / schematic added 6/03) |
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8 watt audio amp (Aaron Cake) - Here is the schematic for an 8 watt audio
amp. This amp can be used as a simple booster, the heart of a more complicated
amplifier or used as a guitar amp. (diagram added 08/08/08) |
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8 x 8 Audio Video Switch - (electronic Circuit added 03/06) [Peter Jakab,
Electrical Engineer, Engineer of Informatics] |
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80 Watt Amplifier (National) - Uses LM12 chip (app note added 4/02)
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80w 1 chip audio amp - Schematic only, no circuit description |
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80W Tube Monoblock Amplifier - My goal was to design a high-powered
wide-bandwidth amplifier with the finest sound and to keep it simple but not too
simple. I rejected single-ended (SE) designs because of their low power….(electronic
design added 04/05/06) |
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