A unique input stage allows inputs to be ground referenced or ac coupled as required. View and download national semiconductor lm380 user manual online. The 8pin version of the lm380 is capable of around 1w, but thats under ideal conditions. The output automatically selfcenters to onehalf the supply voltage.
Audio power amplifier, lm380 datasheet, lm380 circuit, lm380 data sheet. Jul 14, 20 amplifier using lm380n8 i connected 2 4ohms speaker in series to have make it 8ohms. This circuit will produce 250mw of audio power with only a 5v dc source. It develop upward for apply to change digital signal to analog signal circuit dac and change low filter circuit. 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. 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. Dec 01, 2016 i recommend spending a little time on this, as the result is well worth the effort. 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.
In order to hold system cost to a minimum, gain isinternally fixed at 34 db. 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. 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 simplicity of this circuit is made possible by the lm380 s minimal requirements for external components, since it.
Simple three way audio amplifier with lm380lm384 and. Lm380 power audio amplifier circuit diagram circuit wiring. The output is short circuit proof with internal thermal. Figure 1 shows a simplified circuit schematic of the lm380.
The lm380 is a power audio amplifier for consumer applica tion. 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. The output is automatically self centering to one half the supply voltage. Power audio amplifier ic lm380 small signal amplifier are essentially voltage amplifier that supply their loads with larger amplifier signal voltage. 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. Simple audio circuits 1 everyday practical electronics. Just follow the schematic layout from left to right.
Output is short circuit proof with internal thermal limiting. 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. 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. Feb 3, 2019 mini amplifier circuit diagram using lm380. Both the ics are able to deliver output power around 2w to 2.
But after prototyping with this audio amp i dont think ill ever go back to the lm386. A unique input stage allows inputs to beground referenced. The circuit shown in figure 1 is a very simple audio power amplifier. A unique input stage allows groundreferenced input signals. In audio systems, the amplifier delivers high current compared with other operational amplifiers. Lm380 power audio amplifier circuit diagram circuit. Lm386 low voltage audio power amplifier echelle inconnue. For stereo application, just build the identical circuit. Lm380 oscillator circuit datasheet, cross reference, circuit and application notes in pdf format. The output is short circuit proof with internal thermal limiting. National semiconductor lm380 user manual pdf download.
Lm380 audio power amplifier bridge stereo elec circuit. Mar 27, 2015 this is the very simple circuit of mini audio amplifier single channel mono using low cost ic lm380. Recent listings manufacturer directory get instant insight into any electronic component. A specific input signal allows ground reference signal and the out signal maintains its level to the half of the applied input voltage.
This example uses the 8 pin audio amplifier the lm3808. The lm380 is a power audio amplifier intended for consumer applications. The circuit that i used was taken from an old textbook at my high school. This lm386 audio amplifier circuit can be used as small mic and loudspeaker system for a small space like a room.
Input ground pin 2,7 is carefully separated from power ground vcc,speaker and they both meet at pin 4. In order to hold system cost to a lowquiescentpowerdrain. There are many other audio amp ics on the market lm380 and lm383 are. Ti1, alldatasheet, datasheet, datasheet search site for electronic components and. The lm380 is a power audio amplifier for consumer applica tions. Lm380 datasheet, lm380 pdf, lm380 pinout, equivalent, replacement audio power amplifier national semiconductor, schematic, circuit, manual.
This audio amplifier circuit is useful in classrooms to reduce the strain of lecturing,if the surrounding environment is noisy. Circuit a will give a voltage amplification of 200. I fabricated two separate mono amplifiers on their own pcbs and then mounted them in a case. The main component of this circuit is the lm380 audio amplifier. Most of the schematics over the net miss that absolutely important point. The audio amplifier will be a selfcontained, batteryoperated component. The supply voltage needs to be no more than 12v and the load impedance should not be less than 8 ohms. Lm380 is an audio amplifier used specially for power audio amplification purposes. Audio power amplifier august 2000 lm380 block and schematic diagrams. I was a little intimidated by this ic the first time i looked at the datasheet because of all the ground connections.
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. A unique input stage allows inputs to be ground referenced. Try to get at least one grounded component on each side of your module. The lm380 is a power audio amplifier for consumer applications. The output automatically selfcentersto onehalfthe supply voltage. In order to hold system cost to a minimum, a gain is internally fixed at 34 db. At this node, a current is assumed to leave the inverting terminal v of the op amp and go through ri to ground. 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. 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. Audio power amplifier circuit diagrams circuit schematics. Block and schematic diagramslm380nds0069773lm380n8ds0069774ds0069775. Input stage allows the input to be ground referenced or ac coupled.
Lm380audio power amplifiergeneral descriptionthe lm380 is a power audio amplifier for consumer application. 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. An69 lm380 power audio amplifier texas instruments. Dec 14, 2018 amplifier circuit diagram tda7294 240w stereo. The circuit uses a 14pin package lm380 as amplifier element, the input signal by the volume control potentiometer. Kcl and opamps the number 1 indicates the main node of significance. It comes in threeflavors, the lm3861, lm3862, and lm3863, which can provide 0. The lm380 is a power audio amplifier for consumer applica.
The lm386 is very prone to various noises due to bad grounding. We are in need of simple three way audio power amplifier for experiments. A unique input stage allows ground referenced input signals. The output is automatically self centeringto one half the supply voltage. The technician can use it as simple noninverting 2w amplifier, or in conjunction with a single bipolar transistor, as a small baby alarm.
It features an internally fixed gain of 50 34 db and an output which automatically centers itself at onehalf of the supply voltage. Nsc, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Output is short circuit proof with internal thermal. It uses the power amplifier ic lm380 that gives 2 watts output which is sufficient in a confined area. Simple mic audio amplifier can amplify sound that is given from microphone. This means the current used by the loads cannot be driven straight through the generalpurpose amplifier s output.
This article discusses an overview of the ic lm380 audio amplifier and its applications. The amplifier is portable and the whole circuit and the battery can be enclosed in the speaker box itself. Sep 12, 2015 lm386 is a low voltage audio amplifier and frequently used in battery powered music devices like radios, guitars, toys etc. This circuit can also be used in many applications like portable music players, intercoms, radio amplifiers, tv sound systems, ultrasonic drivers etc. 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. 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. It has been available for several decades and is still available new. Output is automatically self centring to one half of the supply voltage. In the second part of the lab you will construct a. Lm380 datasheet pdf national semiconductor ti old version datasheet texas instruments acquired. Lm380 datasheet, lm380 pdf, lm380 data sheet, lm380 manual, lm380 pdf, lm380, datenblatt, electronics lm380, alldatasheet, free, datasheet, datasheets, data sheet. 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.
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. Some circuits would be illegal to operate in most countries and others are dangerous to construct and should not be attempted by the inexperienced. Nightfire audio amplifier kit lm380 by nightfire electronics. The lm380 has a fixed gain of 50 34db and unlike the lm386 there is no facility to change it. In order to hold system cost to a minimum, gain is internally fixed at 34 db. Lm380 audio power amplifier datasheet, cross reference, circuit and application notes in pdf format. Feb, 2016 hello all, a few years back, i made a stereo amplifier, using a couple of lm380 ics. The circuit c is not for voltage amplification but. 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.