LMN/NOPB Texas Instruments Audio Amplifiers 5-W AUDIO POWER AMP datasheet, inventory, & pricing. LMN Datasheet, LMN National Semiconductor 5-Watt Audio Amplifier Datasheet, buy LMN. The LM is a power audio amplifier for consumer applica- tion In order to hold system cost to a minimum gain is internally fixed at 34 dB A unique input stage.

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Every so often, you’ll find a need for a low power amplifier. Uses range from signal tracers, workshop monitor amps to listen to distortion residuals for exampleor just a simple project for the fun of it. While it looks very similar to the LM circuit shown above, note that the pin numbers are different. The LM is a power audio amplifier for consumer. The output automatically self-centers to one-half the. The bypass cap C2 is optional as well, but if you don’t include it the power supply rejection is rather poor, so anything other than a battery supply may cause some hum.

They can be run without a heatsink, but only for low power output, and care is needed to ensure the IC doesn’t overheat.

The minimum useful voltage is around 6V, and 12V is the maximum suggested for the LM It’s theoretically possible if you use a high supply voltage and a 16 or 32 ohm load, but that’s not recommended because device dissipation will be well in excess of that which the device can handle safely.

The LM is available in two packages – 8-pin and pin. The LM is also available in a pin package, which has greater dissipation and can provide more power. These are certainly not hi-fi by any stretch of the imagination, but they are fine for a utility amplifier where a bit of distortion is unlikely to be a deal-breaker.



Home – IC Supply – Link. The output automatically self-centers to one-half the supply voltage.

The datasheets don’t mention it, but there’s every chance that the ICs will oscillate if you fail to bypass the supply. I don’t think I even need datassheet say that this IC isn’t suitable for a subwoofer. The only thing that even approaches being critical is the bypass cap. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

The negative input signal doesn’t get cut off as you might expect, because the emitter is still positive. Probably the most interesting thing to look at is the input stages. It would be worthwhile to give it a very light spray with matte black paint darasheet improve radiation.

LM386, LM380 & LM384 Power Amplifiers

I’ve shown the LM with the same component values as the LM, and performance will datasjeet similar, but you can get higher power. In order to hold system cost to a. These are allegedly available, but I couldn’t find anything even remotely similar from my normal suppliers.

All trademarks are the property of their respective owners. The 8-pin version is only suitable for low datasheet similar to the LMbut the pin version can be fitted with small heatsink ‘flags’ that allow it to provide up to 2. That’s one of the reasons that the higher voltage ICs LM and LM have a higher gain than the LM – it’s simply to ensure full output swing before the lj384n stage causes distortion.

Production processing does not. The 8-pin version of the LM is capable of around 1W, but that’s under ideal conditions. A copper lead frame is used with the center three. Add a resistor and capacitor in series between pins 1 and 8 for intermediate gains.

Despite the fact that many of its functions appear to be almost identical to the LM, the two are quite different and even the 8-pin versions of each have different pinouts and are not interchangeable. Two are needed, one for each side of the IC. The supply voltage needs to be no more than 12V and the load impedance should not be less than 8 ohms. The author Rod Elliott grants the reader the right to use this information for personal use only, and further allows that one 1 copy may be made for reference while constructing the project.


The IC is useful for headphones, intercoms, portable radios etc. Construction of any of these amps is non-critical, and Veroboard or similar is the way that most people would build one. If you do omit C1, you will almost certainly hear some ‘scratching’ noises from the pot as it’s rotated because there’s a small DC datqsheet at the inputs.

The quiescent output voltage is set internally to be half the supply voltage, and by default the gain is 20 26dB. While you may see it rated for datashedt to 1W output, this is a little adventurous to put it mildly. They are able to vatasheet with a signal that goes below zero volts Gnd because a PNP transistor is used. The preferred method is to make or buy copper heatsinks that can be soldered directly to the pins.

It usually won’t need to be anything special, but it will usually have to be cheap and easy to build. The tabs solder to the IC pins, and the underside of the heatsink should be coated with heatsink compound to increase the thermal conductivity.