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Product description:
Features:
1. ESS9038+CSR8675 Bluetooth fever decoder board Bluetooth receiver board
2. Bluetooth supports LDAC/APTX-HD/APTX-LL/APTX/SBC/AAC protocol
3. The Bluetooth audio receiving board uses the CSR8675 chip solution to receive the Bluetooth digital audio signal, and transmits the SPDTF coaxial digital signal to the ESS9038Q2M chip for decoding.
4. The output analog audio signal is filtered and amplified by 3 dual op amps.
5. Support wireless Bluetooth reception and one AUX analog audio input for switching output. The relay is used for lossless switching, which will not affect the sound quality in any way. The module defaults to AUX line mode, and the switching mode is automatic switching, with Bluetooth priority.
6. It is a high-level version that supports the LDAC/APTX-HD/APTX-LL/APTX/SBC/AAC protocol, and the highest sampling rate is 24bit/96khz, which is far beyond APTX-HD&x27;s 24bit/48knz sampling rate.
7. DC single power supply, wide voltage range DC 10V-32V can be used, the product is designed with an isolated power supply voltage regulator module, which can directly share the power supply with the original power amplifier or front-end equipment, no need for independent power supply.
It can also be used for vehicle modification. The board comes with an isolated power supply regulator module, which can be directly connected to the vehicle&x27;s 12V power supply.
8. Multi-level voltage stabilization design. The Bluetooth module, DAC chip, and op amp chip are all powered by independent power management chips. The op amp uses dual (positive and negative) 14V power supplies, which is an absolute fever-level design.
wiring:
①. DC power input interface, red (EXACC) is positive, black (GND) is negative. Support DC10V-32V. Note: AC power cannot be used.
②. AUX analog audio input interface, the white wire (INL) is the left channel, the black (GND) is the audio ground wire, and the red (INR) is the right channel. Note: The audio ground wire cannot be connected wrongly.
③. Audio output interface, the white wire (L-OUT) is the left channel, the black (GND) is the audio ground wire, and the red (R-OUT) is the right channel. Note: The audio ground wire cannot be connected wrongly.
④ The Bluetooth external antenna buckle, the antenna with the buckle position can be directly buckled, and the 2.4G antenna can be used. The module must be installed with an external antenna when installed in the case of the Jinqu shell, otherwise the receiving distance will be severely affected.
![](https://ae01.alicdn.com/kf/Hef104c9e2b4c49f8a60a546ad9e5db2ax.jpg)
① CSR8675 bluetooth scheme, supports LDAC/APTX-HD/APTX-LL/APTX/SBC/AAC protocol, LDAC supports 24bit/96khz sampling rate.
②ESS9038Q2M decoder chip, high-parameter high-resolution DAC, support up to 32bi l/384khz
③Three 0PA2604AU operational amplifiers filter output, the two near the DAC decoder chip are left and right channel I/V perfusion, one chip is responsible for one channel, and the separation is better. The latter one is the left and right channel amplified output to improve the dynamics and thrust
④ The power conversion circuit converts the input single power supply into dual (positive and negative) MV regulated DC power supplies to supply power to the operational amplifier.
The dynamic and sound quality of the operational amplifier with dual power supply is much better than that with single power supply. The DC output of the op amp powered by a single power supply needs to be coupled with a coupling capacitor to isolate the DC output.
The output of the dual power supply op amp does not have DC and does not require coupling capacitor isolation. The sound quality of the direct output is much better than that of the coupling capacitor.
⑤NEC imported relay, responsible for the switch of Bluetooth and AUX signal. Automatic detection switch, default AUX, Bluetooth priority.
⑥ MCU chip, cooperate with the developed firmware program to control the intelligent operation of the board. Motherboard design, fully isolated power supply module, completely separated from the main board,
The power processing circuit will generate some high-frequency magnetic fields, which can easily interfere with the audio signal. The mother board is designed to provide a purer power environment for the motherboard.
Q: What is the function of switching AUX input with relay?
Answer: This is to help solve the problem of installing a Bluetooth receiver board on power amplifiers or active speakers with only one audio input. For example, a computer active speaker has only one input function. When connecting to a Bluetooth receiver board, you cannot plug in external audio sources such as a computer sound card or CD player. The audio input needs to be unplugged, which is very inconvenient to use. If there is an AUX input, you can use the Bluetooth AUX interface to connect to external audio sources such as a computer sound card or CD player, and the output interface of the Bluetooth receiver board is connected to the input of an active speaker, so there is no need to unplug the cable, and the Bluetooth board automatically switches the Bluetooth mode or AUX mode. After Bluetooth is connected, the Bluetooth output will be automatically switched, and when Bluetooth is disconnected, it will automatically switch to the AUX interface, and power off is also the function of AUX direct connection. If you don’t understand, please contact the owner. Thanks for your support
Package included:
1Pcs
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