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Amplifiers: Audio Circuits
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Audio Circuits -- Main Page
Audio Amplifiers:
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Last Updated on:
Friday, March 12, 2010 12:07 PM
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Links to electronic circuits, electronic
schematics, designs for engineers, hobbyists, students & inventors:
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4 Channel Stereo Audio Selector - The add-on circuit presented here is
useful for stereo systems. This circuit has provision for connecting stereo
outputs from four different sources/channels as inputs and only one of them is
selected/connected to the output at any one time....(circuit added 8/06)
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4 Watt Amplifier - (circuit / schematic added 6/03) |
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45W HEXFET Power Amplifier - An ideal solution to make a good, low cost
power amplifier ….(electronic schematic added 11/08) |
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4-Transistor Amplifier for Small Speaker Applications - The circuit above
shows a 4-transistor utility amplifier suitable for a variety of projects
including receivers, intercoms, microphones, telephone pick-up coils, and
general audio monitoring. The amplifier has a power isolation circuit and
bandwidth limiting to reduce oscillations and "motorboating"....(circuit design
added 05/05/05) |
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4-Transistor Transmitter (Paul C. Sherby) - This circuit provides an FM modulated
signal with an output power of around 500mW. The input microphone pre-amp is
built around a couple of 2N3904 transistors (Q1/Q2), and audio gain is limited by the
5k preset trim potentiometer. The oscillator is a Colpitts stage, frequency of
oscillation governed by the tank circuit made from two 5pF ceramic capacitors and the
L2 inductor....(electronic circuit added 05/07) |
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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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5,000W ultra-light, high-power Amplifier, without switching-mode power supply -
This circuit is of an 2x 2,500W RMS stereo amplifier, super-light and without
switching-mode power supply. The circuit just shows a channel, and the power supply
that it assists to the two channels. The audio circuit should be duplicated, but the
power supply assists to the two channels without problems.....(circuit / schematic
added 09/08) |
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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, and attaching a pre-built
heatsink assembly with the output transistors. Three workshops were held between 1995
to 1996. Though the design is simple, these amplifiers have impressive performance,
with a frequency response to approx 40 kHz, very low noise, reasonably fast slew rate,
and approx 50 watts (true "RMS" power) with the proper +/- 40 volt unregulated power
supply. ….(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) |
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