LM386 Audio Amplifier IC (10pc).
The integrated chip LM386 is a low-power audio frequency amplifier requiring a low-level power supply (most often batteries). It comes in an 8-pin mini-DIP package. The IC is designed to deliver a voltage amplification of 20 without external add-on parts. But this voltage gain can be raised up to 200 (Vu = 200) by adding external parts.
The IC is powered using pin 6 (typically 5 or 9V) and the ground pin 4 is connected to the ground. The inverting pin (pin 2) is normally grounded and the Non-inverting pin (pin 3) is provided with the Audio signal. This audio signal can be from a microphone or even from a 3.5mm jack. The 10k resistor is added in series with the audio signal to act as a volume control. You can ignore this potentiometer if you want to operate at full volume.
Pin 1 and pin 8 are used to set the gain of the Amplifier. If there is nothing connected between these pins then the default gain will be 26 dB, but we can connect a 10 uF capacitor across it to get the maximum gain of the IC which is 46 dB. Pin 7 is used to connect a filtering capacitor (0.1uf) for our amplifier IC to avoid unnecessary oscillations. The amplified audio signal can be obtained from pin 5 which is connected to an 8-ohm speaker through a filtering capacitor. The RC network with 0.05uF and 10k resistor is optional.
LM386 Audio Amplifier IC (10pc) Specification:
| Parameter | Specification |
| Part number | LM386 |
| Audio input type | Analog Input |
| Architecture | Class-AB |
| Speaker channels (Max) | Mono |
| Power stage supply (Min) (V) | 4 |
| Power stage supply (Max) (V) | 18 |
| Output power (W) | 0.325 |
| Load (Min)(ohms) | 4 |
| THD + N @ 1 kHz (%) | 0.2 |
| Iq (Typ) (mA) | 4 |
| Control interface | Hardware |
| Closed/open loop | Closed |
| Analog supply (Min) (V) | 4 |
| Analog supply (Max )(V) | 18 |
| PSRR (dB) | 50 |
| Operating temperature range (C) | 0 to 70 |
LM386 Audio Amplifier IC (10pc) Features:
