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Miniature amplifier on LM386 - kit kit


A simple miniature amplifier built on a specialized low-voltage microcircuit, the LM386 audio amplifier can be used as a low-power headphone amplifier. This is true in a situation where the signal from some device, such as a portable player or phone, is not strong enough to swing the speakers of your headphones.

This designer has all the necessary parts along with a printed circuit board - all that remains is to solder electronic components into the drilled holes, apply power, an audio signal and get an amplified signal at the output.
Miniature amplifier on LM386 - kit kit

Naturally, this device, based on the tiny LM386 microcircuit, will not be able to provide high quality amplification, but its price is corresponding. By default, power is supplied through a 2.1 mm jack (it is also possible through PLS pins), the input voltage ranges from 3 to 12 V. As a power source, you can use any charging phone, USB port or any network power supply with minimal ripple at the output . Below you see a list of all the components included in the amplifier circuit.

This amplifier, according to the seller, is capable of “swinging” dynamic heads with power from 0.5 to 10 watts. The volume is controlled by a variable resistor of 100 kOhm, connected at the input. An analog signal is fed through the 3.5 mm audio jack or PLS pins, the amplified output signal is removed from the PLS pins. Board dimensions 37 by 41 mm. A glowing red LED indicates power to the circuit.

Cost: ~ 58

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2 commentary
The author is well done - he fixed almost all the flaws.
1. LM386 is not an operational amplifier!
2. "plug the headphones into the jack" does not work, because the output is pinned. ;)
3."universal serial bus" - the term USB should not be translated.
4. The maximum power of the amplifier is 0.7 W, so heads can be connected more powerful than 1 W, of course, it is possible, but to write that it “shakes” out is a typical Chinese “lohomarketing”.
5. J1 - not a headphone jack, but an input jack.
6. "... input voltagee"- and this board also has" insrunning supply voltage "?
7. An input capacitor of 0.1 μF will ensure normal operation at low frequencies only when using an amplifier for, say, radio communications, if you listen to music, then it must be significantly increased.

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