182 In stock
Bluetooth Decoding Board
IWISTAO HIFI Vacuum Tube Bluetooth 5.0 Audio Hardware Decoding Board 12AU7 CSR8675 ESS9018 APTX-HD
Model No: WHFB-BTV12AU7
This is a HIFI vacuum tube Bluetooth audio decoding board. CSR8675 chip with Bluetooth 5.0 is used as the Bluetooth digital audio signal receiving, and I2S digital signal is transmitted to ESS9018 chip for hardware decoding. The output analog signal is filtered by dual op amp NE5532, and then amplified by vacuum tube 12AU7.
The receiving board supports one channel wireless Bluetooth receiving and one channel AUX analog audio signal input. The default is AUX line input, and automatic switching lossless output is performed by relays, and its Bluetooth signal takes precedence. AUX signal is also amplified by the tube, and the receiving board is equivalent to a tube preamplifier at the time. This decoding board supports the LDAC protocol and supports the highest sampling frequency of 24Bit/96Khz, far exceeding the sampling frequency of the APTX-HD 24Bit/48Khz.
1. It is powered by a wide voltage DC single power supply with a voltage range of 12V-32V.
2. Adopts multi-stage voltage regulator design. Bluetooth module, DAC chip and op amp chip are powered by independent power management chip; and the op amp uses dual 13V power supply.
3. Vacuum tube 12AU7 is powered by 110V high voltage.
4. OP amp and tube are installed in the form of a socket, which is convenient for players with different preferences to replace its op amp or vacuum tube.
1. Input working voltage: DC12-32V
2. Input impedance: greater than or equal to 10k ohms
3. Input voltage: less than or equal to 2Vrms
4. Output impedance: greater than or equal to 10k ohms
5. Output voltage: less than or equal to 3Vrms
6. Bluetooth support transmission protocol: LDAC, APTX-HD, AAC, SBC
7. Size (L*W*H): 85mm * 67.5mm* 26mm
8. Weight: 0.3kg
a. Tube 12AU7 x 1 pc
b. connection wire x 3pcs
c. Bluetooth Receive antenna x 1 set
Decoding board wiring diagram
1. DC power input interface. Red (+12V) is positive and black (GND) is negative. Note: AC power cannot be used, otherwise the board will be burnt.
2. AUX analog audio input interface. White (INL) is the left channel, black (GND) is the audio ground, and red (INR) is the right channel. Note: The audio ground wire cannot be connected incorrectly.
3. Audio output interface. White (L-OUT) is the left channel, black (GND) is the audio ground, and red (R-OUT) is the right channel. Note: The audio ground wire cannot be connected incorrectly.
4. Bluetooth external antenna connector. Install the connector of the Bluetooth receiving antenna. Since the Bluetooth module is installed in metal chassis, an external receiving antenna must be installed, otherwise the reception of the Bluetooth audio signal is seriously affected.
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