If your project needs an audio amplifier, this module should be useful. It is a miniature module for amateur projects. Simply connect a 4-8 Ohm speaker and amplify your sound. It can used with FM receiver kit or WTV020SD-16P music module. You can definitely use this module for other musical projects also. Based on the popular LM386-1 audio amplifier, this tiny PCB module can provide up to 300mW of audio power. Easily configured for either 20 (26dB) or 200 (46dB) gain.
On-board LM386 Chip
On-board speaker wiring block.
On-board 10K variable resistor, you can adjust the volume with it.
On-board power indicator.
The chip pin leads, can be directly input audio signal
Operating voltage: 4 ~ 12V
Size:41 x13 mm
Pins 1 & 8 of the LM386 amplifier chip are used to set the amplifier gain. If they are left open (unconnected), the gain is set by an internal resistor to 20 (26 dB). If a 10 uF capacitor is connected between pins 1 & 8 the internal resistor is bypassed, and gain is set to 200 (46 dB). An external resistor can be used to set the gain anywhere in between.
This module has a capacitor and a zero Ohm resistor in series between pins 1 & 8, so the gain is set to 200. If you need lower gain (in other words, a less sensitive amplifier) you can un-solder the zero Ohm chip resistor R1, or simply clip it in half wit a small pair of diagonal or flush cutters. Just be careful not to damage the other components on the board.