The simplicity of this circuit is made possible by the lm380 s minimal requirements for external components, since it. Sep 12, 2015 lm386 is a low voltage audio amplifier and frequently used in battery powered music devices like radios, guitars, toys etc. Audio power amplifier, lm380 datasheet, lm380 circuit, lm380 data sheet. This means the current used by the loads cannot be driven straight through the generalpurpose amplifier s output. But after prototyping with this audio amp i dont think ill ever go back to the lm386.
Figure 1 shows a simplified circuit schematic of the lm380. Just follow the schematic layout from left to right. A unique input stage allows inputs to be ground referenced or ac coupled as required. I built about a dozen different audio amplifier circuits with the lm386 but most of them had way too much noise, popping, and other interference. Input ground pin 2,7 is carefully separated from power ground vcc,speaker and they both meet at pin 4. Lm380 1features description wide supply voltage range. Recent listings manufacturer directory get instant insight into any electronic component. Both the ics are able to deliver output power around 2w to 2. The output is short circuit proof with internal thermal. Page 4 the transfer function of the circuit of amplifier where the addition of volume and tone controls is figure 10 is given by required figure 8 shows the lm380 with a voltage divider volume control and high. Mar 27, 2015 this is the very simple circuit of mini audio amplifier single channel mono using low cost ic lm380. Lm380 audio power amplifier national does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and national reserves the right at any time without notice to change said circuitry and specifications. The lm380 is a power audio amplifier intended for consumer applications. The lm380 2 watt audio amplifier circuit shown here is an easy to build circuit using only few external parts and able deliver 2w to 2.
The output is automatically self centering to one half the supply voltage. Nightfire audio amplifier kit lm380 by nightfire electronics. The output automatically selfcenters to onehalf the supply voltage. In order to hold system cost to a minimum, a gain is internally fixed at 34 db. This example uses the 8 pin audio amplifier the lm3808. Lm380 datasheet pdf national semiconductor ti old version datasheet texas instruments acquired. Audio amplifier circuit electrical and computer engineering.
This is mini old amplifier circuit that used an op amp audio amplifier at have strip zone frequency wide. For stereo application, just build the identical circuit. In order to hold system cost to a minimum, gain isinternally fixed at 34 db. Lm380 power audio amplifier circuit diagram circuit. A specific input signal allows ground reference signal and the out signal maintains its level to the half of the applied input voltage. Input stage allows the input to be ground referenced or ac coupled.
Output is short circuit proof with internal thermal limiting. The lm380 is a power audio amplifier for consumer applica. The output automatically selfcentersto onehalfthe supply voltage. The audio amplifier will be a selfcontained, batteryoperated component. The technician can use it as simple noninverting 2w amplifier, or in conjunction with a single bipolar transistor, as a small baby alarm. It comes in threeflavors, the lm3861, lm3862, and lm3863, which can provide 0. The circuit shown in figure 1 is a very simple audio power amplifier. Kcl and opamps the number 1 indicates the main node of significance. This circuit will produce 250mw of audio power with only a 5v dc source.
Lm380 audio power amplifier bridge stereo elec circuit. Lm380 is an audio amplifier used specially for power audio amplification purposes. The lm380 is a power audio amplifier for consumer applica tion. The gain range is 20 to 200, gain is internally set to 20 without using external component but can be increased to 200 by using resistor and capacitor between pin 1 and 8, or just with a capacitor. Ti1, alldatasheet, datasheet, datasheet search site for electronic components and. It has been available for several decades and is still available new. The circuit that i used was taken from an old textbook at my high school. Lm386 low voltage audio power amplifier december 1994 lm386 low voltage audio power amplifier general description the lm386 is a power amplifier designed for use in low voltage consumer applications.
A unique input stage allows groundreferenced input signals. National semiconductor lm380 user manual pdf download. Most of the schematics over the net miss that absolutely important point. Lm380 datasheet, lm380 pdf, lm380 pinout, equivalent, replacement audio power amplifier national semiconductor, schematic, circuit, manual. Lm380 power audio amplifier an69 national semiconductor application note 69 december 1972 lm380 power audio amplifier introduction the lm380 is a power audio amplifier intended for consumer applications. At this node, a current is assumed to leave the inverting terminal v of the op amp and go through ri to ground. There are many other audio amp ics on the market lm380 and lm383 are. Block and schematic diagramslm380nds0069773lm380n8ds0069774ds0069775. The 8pin version of the lm380 is capable of around 1w, but thats under ideal conditions. Output is automatically self centring to one half of the supply voltage. Lm380 audio power amplifier generaldescription the lm380 is a power audio amplifier for consumer application in order to hold system cost to a minimum gain is internally fixed at 34 db a unique input stage allows inputs to be ground referenced the output is automatically self centering to one half the supply voltage. It uses the power amplifier ic lm380 that gives 2 watts output which is sufficient in a confined area. Build a great sounding audio amplifier with bass boost. The following figure is a common noninverting op amp circuit that will be repeated later on in the tutorial.
This audio amplifier circuit is useful in classrooms to reduce the strain of lecturing,if the surrounding environment is noisy. Audio power amplifier circuit diagrams circuit schematics. Simple three way audio amplifier with lm380lm384 and. Sep 29, 2014 i take a look at the lm380 amplifier ic.
Lm380audio power amplifiergeneral descriptionthe lm380 is a power audio amplifier for consumer application. There are many other audio amp ics on the market lm380 and lm383 are similar but higherpower amps from national, but the lm386 is sufficient for our purposes. The circuit uses a 14pin package lm380 as amplifier element, the input signal by the volume control potentiometer. The amplifier is portable and the whole circuit and the battery can be enclosed in the speaker box itself. Dec 14, 2018 amplifier circuit diagram tda7294 240w stereo. Lm380 audio power amplifier general description the lm380 is a power audio amplifier for consumer application. Try to get at least one grounded component on each side of your module. We are in need of simple three way audio power amplifier for experiments. Lm380 audio power amplifier datasheet, cross reference, circuit and application notes in pdf format. This paper describes the circuit operation of the lm380, its power handling capability, methods of volume and tone control, distortion, and various application circuits such as a bridge amplifier, a power supply splitter, and a high input impedance audio amplifier. Feb 3, 2019 mini amplifier circuit diagram using lm380. The circuit is using lm380n version which is a 14 pin dip package ic with good features like it can be operated on a wide range. Mar 21, 2015 this paper describes the circuit operation of the lm380, its power handling capability, methods of volume and tone control, distortion, and various application circuits such as a bridge amplifier, a power supply splitter, and a high input impedance audio amplifier. This is best lm386 amplifier schematic ive seen so far.
The lm386 is very prone to various noises due to bad grounding. Note that all these links are external and we cannot provide support on the circuits or offer any guarantees to their accuracy. This lm386 audio amplifier circuit can be used as small mic and loudspeaker system for a small space like a room. Some circuits would be illegal to operate in most countries and others are dangerous to construct and should not be attempted by the inexperienced. It features an internally fixed gain of 50 34 db and an output which automatically centers itself at onehalf of the supply voltage. Feb, 2016 hello all, a few years back, i made a stereo amplifier, using a couple of lm380 ics. I fabricated two separate mono amplifiers on their own pcbs and then mounted them in a case. In order to hold system cost to a lowquiescentpowerdrain. Lm380 audio power amplifier generaldescription the lm380 is a power audio amplifier for consumer application in order to hold system cost to a minimum gain is internally fixed at 34 db a unique input stage allows inputs to be ground referenced the output is automatically self centering to one half the supply voltage the output is short circuit.
The output is automatically self centeringto one half the supply voltage. Lm380 datasheet, lm380 pdf, lm380 data sheet, lm380 manual, lm380 pdf, lm380, datenblatt, electronics lm380, alldatasheet, free, datasheet, datasheets, data sheet. The main component of this circuit is the lm380 audio amplifier. Circuit a will give a voltage amplification of 200. In order to hold system cost to a minimum, gain is internally fixed at 34 db. Symbols and schematic below is the symbol used to represent an operational amplifier. An69 lm380 power audio amplifier texas instruments. Lm380n8 audio amplifier circuit ic is an another 8 pin dip version of lm380n audio amplifier ic which is available in 14 pin dip package.
This article discusses an overview of the ic lm380 audio amplifier and its applications. The circuit c is not for voltage amplification but. It develop upward for apply to change digital signal to analog signal circuit dac and change low filter circuit. A unique input stage allows inputs to beground referenced. Dec 01, 2016 i recommend spending a little time on this, as the result is well worth the effort. The supply voltage needs to be no more than 12v and the load impedance should not be less than 8 ohms.
Circuit description figure 1shows a simplified circuit schematic of the lm380. The supplies are discussed further in the pages ahead. The output is short circuit proof with internal thermal limiting. The lm380 is a power audio amplifier for consumer applica tions. The lm380 has a fixed gain of 50 34db and unlike the lm386 there is no facility to change it. I was a little intimidated by this ic the first time i looked at the datasheet because of all the ground connections. A unique input stage allows inputs to be ground referenced. Nsc, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. In this tutorial, ill show you how to build a great sounding audio amplifier with the lm386 low voltage audio power amplifier. This is mini old amplifier circuit that used an opamp audio amplifier at have strip zone frequency wide. A unique input stage allows ground referenced input signals. Output is short circuit proof with internal thermal.
Lm386 low voltage audio power amplifier echelle inconnue. The lm380 is a power audio amplifier for consumer applications. In audio systems, the amplifier delivers high current compared with other operational amplifiers. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will. This circuit can also be used in many applications like portable music players, intercoms, radio amplifiers, tv sound systems, ultrasonic drivers etc. Simple audio circuits 1 everyday practical electronics. Lm380 power audio amplifier circuit diagram circuit wiring. Audio power amplifier august 2000 lm380 block and schematic diagrams. Lm380 oscillator circuit datasheet, cross reference, circuit and application notes in pdf format.
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