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LM386 Audio Amplifier Circuit Diagram
https://circuitdigest.com/electronic-circuits/lm386-audio-amplifier-circuit
This circuit is based on LM386 IC to amplify sound. LM386 is a low voltage audio amplifier and frequently used in battery powered music devices like radios, guitars, toys etc. 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.
DIY LM386 Audio Amplifier : …
https://www.instructables.com/DIY-LM386-Audio-Amplifier-DatasheetCircuitPCBHardw/
Fourth graph states that gain can be variable from 26dB (20) to 46dB (200), when pin 1 and 8 are bypassed by a 10uF capacitor. Datasheet says: To make the LM386 a more versatile amplifier, two pins (1 and 8) are provided for gain control. With pins 1 and 8 open the 1.35-kΩ resistor sets the gain at 20 (26 dB).
LM386 based Audio Amplifier | Full Project with Circuit ...
https://www.electronicsforu.com/electronics-projects/lm386-based-audio-amplifier
Fig. 2: Circuit diagram of the LM386 based audio amplifier. Inverting pin 2 of IC1 is connected to ground and non-inverting pin 3 is connected to the input terminal through VR1. Audio input is fed to CON1. VR1 is used to control volume. Construction and testing. A single-side PCB for LM386 amplifier is shown in Fig. 3 and its component layout in Fig. 4.
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