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Amplifiers: Audio Circuits
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Amplifier -- Main Page
Audio Circuits -- Main Page
Audio Amplifiers: #'s
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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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LM3876 GainClone Amplifier - The amp is based on the Project 19 PCB, so uses a
pair of LM3876 (or LM3886) power opamps, run from a ±35V supply. I used a cut-down P88
preamp PCB because I only wanted one preamplifier stage, but the entire board can also
be used. Alternatively, the P19 amp can be run at higher gain than normal, alleviating
the need for a preamp at all. The down side of this is that the noise level will be
higher, and background noise may be audible with efficient speakers and/ or very quiet
surroundings. ….(electronic schematic added 11/08) |
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LM3886 Amplifier - When I fired it up for the first time, I was immediately
surprised with how much power was available, the level of detail and the nice bass
response. It sounded much better than I was expecting and much better than it should
considering the simplicity and low cost. Initially, I thought it sounded a little
bright, but after about 12 hours the sound became more relaxed. ….(design added 11/08) |
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LM3886 Gainclone 2x68 Watt Full Amplifier - In this application, we are building a
gaincard like amplifier. This application type is named gainclone in audio world. To
take a satisfactory audio response, we are adding a Linkwitz equaliser to the feedback
line and adding bass compensation also. We are using LM3886 which is the revised
version of its brother LM3875. These are the parameters that we are intereted in.
Honestly this values are much more better than many of HI-FI amplifiers sold in the
market. Especially it is hard to find 110dB signal to noise ratio. And another
property is, when there is no input, this amplifier is quite like a dead. It is nearly
impossible to hear any noise when you stick your ear to the speakers. ….(design added
11/08) |
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LM3886 Monoblock Gainclone Amplifier - This is a monoblock Gainclone amp based on
a LM3886 IC which is more suited to 4 ohm loads. It will output 70 Watts into 4 ohms.
This version also uses a very high capacitance PSU and a snubber. The case is made
entirely out of recycled aluminum bought from scrap metal yards. ….(circuit design
added 11/08) |
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LM3886 Power Amp with DIY Chassis - This is a simple chassis using just 4 aluminum
panels and 2 heatsinks. Designed around dimensions to tightly pack in a LM3886 chip
amp kit. The top and bottom panels sit in ridges cut into the heatsinks with a table
saw, and then the front and back panels just bolt into the end fins. Rear panel
fixings are held with M3 nut and bolts, and panels that join to the heatsinks are held
by M4 bolts tapped directly into the heatsinks so no additional brackets are required.
Heatsinks are 75 x 160 x 50mm with a 10mm thick base. ….(electronic schematic added
11/08) |
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LM4780 Gainclone Amplifier - This is design is very similar to the National
Semiconductor BPA-200 (Bridge/Parallel Amplifier) which uses 4x LM3886 per channel and
an input buffer. This is design is very similar to the National Semiconductor BPA-200
(Bridge/Parallel Amplifier) which uses 4x LM3886 per channel and an input buffer
….(electronic schematic added 11/08) |
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LM4780 Micro-Amp - Having decided to build an ultra-compact design, using a spare
LM4780 seemed like an obvious plan. Having said that, I might choose a different IC if
I didn't already have one to hand. The LM4780 contains two LM3886 dies (reference)
giving 60 watts per channel, which is rather more than required this application.
National Semiconductor make an enormous range of IC's with differing power levels and
configurations, and there are plenty of possible candidates for this application -
after all, we only need a few watts as this amplifier will principally be driving
small speakers on the computer desk. ….(design added 11/08) |
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Loud Speaker Protection and Muting - Protect speakers from turn-on and turn-off
transients and amplifier faults (electronic schematic / circuit
added 4/02) |
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Loudspeaker Protection - Something you should use in any amplifier, especially in
discrete amplifiers, is loudspeaker protection. The first part is the DC detector.
This circuit will trigger the Off output if DC is present on the audio lines. The
input goes through a low pass filter and then through the diodes. If there's any DC on
the lines it will turn on the two transistors who will then turn on Q3, which triggers
the Off signal. ….(design added 11/08) |
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Loudspeaker Protection and Muting - Many hi-fi amplifiers and professional power
amps (and loudspeaker systems) provide some of protection, either to protect the
speakers from an amp fault, and/or vice versa. Some of these are implemented at a very
basic level - for example the use of a 'poly-switch'. The poly-switch is a non-linear
resistor, having a low resistance ….(electronic schematic added 11/08) |
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Low Cost Audio VCA has High Performance - 01/19/95 EDN-Design Ideas / (added 3/06)
The inherent matching between the two transconductance amplifiers in IC1 (Fig 1)
facilitates a voltage-controlled amplifier (VCA) that offers high performance and low
cost. The circuit's maximum input voltage is +20 dBu (dBu=dB referred to 775 mV rms).
THD measures less than 0.015%; noise, -70 dBu; and control-voltage feedthrough, -70
dB.... |
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