Master chip RDA5851S Bluetooth stereo audio Bluetooth headset module can call AT commands control the audio and SPP SPP can transfer data at the same time absolutely transparent transmission only section can be modified online Bluetooth name and password through AT commands
Only one name and password to modify the Bluetooth stereo Bluetooth audio module online via AT commands. By IO switching, choose to support the SPP AT commands or data transmission. SPP mode by default, high for the AT command mode

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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.

1. GND is negative, OUN is level
2. onboard the LM386 chip
3. 200 times gain circuit design
4. Onboard speaker terminal block
5. Onboard 10K adjustable resistance, you can adjust the zoom level
6. Onboard power led Main PIN
7. Chip has raises, you can directly input audio signal
8. Working voltage: 5~12V
9. Board size 41 (mm) x 13 (mm)

FAQs
Q: How do I reduce the amplifier gain?

A: 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.

Specifications

The post LM386 Audio Amplifier Module 200 Times 5V-12V Input 10K Adjustable Resistance appeared first on Absolute Native Electronics.

Features:

• Miniature digital power amplifier board 2x3w class D power amplifier board, Can work on USB power supply.
• Good noise suppression
• Input audio should be via sheilded wire
• Dual channel stereo output 3 w + 3 w power
• Works with 5v power supply
• can directly drive 4 Ω/8 Ω small speakers
• big output power, sound quality is good.
• Unique without LC filter class D digital power board
• can use computer USB power supply directly
• Double panel wiring, super mini design, can easily fit in a variety of digital products
• high amplification efficiency
• made with solid plate welding machine
• Super size: 1.85 x 2.11 cm

Customer common problems:
1, 2 * 3 w miniature digital power amplifier board class D power supply can use the computer?
Answer: power amplifier board can use a computer power supply, but will produce noise may be produced (also some customers did not appear murmurs), the best advice of independent power supply.
2, miniature digital 2 * 3 w class D power amplifier boards with the speaker of the house is good?
Answer: our speaker is only provide DIY players try, sound is not particularly good, if the pursuit of high sound client can buy separately.
3, 2 * 3 w miniature digital power amplifier board class D why there are noise after power on the speaker?
The answer:
1, appear whistlers, should be the audio input line, the introduction of shielded wire should be used for audio input line, and then there is audio input line don’t hung up to connect good audio source.
2, is a kind of reason may be that some power supply is bad interference is very big, switch power supply.
Customer common problems:
1, 2 * 3 w miniature digital power amplifier board class D power supply can use the computer?
Answer: power amplifier board can use a computer power supply, but will produce noise may be produced (also some customers did not appear murmurs), the best advice of independent power supply.
2, miniature digital 2 * 3 w class D power amplifier boards with the speaker of the house is good?
Answer: our speaker is only provide DIY players try, sound is not particularly good, if the pursuit of high sound client can buy separately.
3, 2 * 3 w miniature digital power amplifier board class D why there are noise after power on the speaker?
The answer:
1, appear whistlers, should be the audio input line, the introduction of shielded wire should be used for audio input line, and then there is audio input line don’t hung up to connect good audio source.
2, is a kind of reason may be that some power supply is bad interference is very big, switch power supply.
Good noise suppression, under the condition of the connected input audio, ears also can’t hear any noise on the speaker, dual channel stereo, 5 v power supply can output 3 w + 3 w power, can be directly driven 4 Ω, 8 Ω small speakers, big output power, energy, sound quality is good. Unique without LC filter class D digital power board, can use computer USB power supply directly. Double panel wiring, properly solve wiring caused by potential balance and crosstalk between channels, super mini design, can be easily placed in a variety of digital products within a small space, high amplification efficiency. Are all made of solid plate welding machine, welding quality of the manual soldering iron welding comparable!

Super size: 1.85 * 2.11 cm
Note: the left and right sound channel output end and “negative” can’t meet together, otherwise will burn IC, and then good speaker should be taken before electricity (load).

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