AK4490 DAC chip, AK4118 transceiver, QCC3034 Bluetooth module, Fiber coaxial Bluetooth audio DAC. Upgrade your audio experience with our cutting-edge design plan featuring the AK4490 DAC chip, AK4118 transceiver, QCC3034 Bluetooth module, and Fiber coaxial Bluetooth audio DAC. This design supports 192K 24bit digital audio, with exceptional parameters like PCM 768kHz and DSD256. Don’t miss out on this legendary generation of audio technology – take your sound quality to the next level today!
This design plan aims to support 192K 24bit digital audio. After thinking about it, the author used the AK4490 DAC chip. Once a legendary generation, the parameters were outrageous back in the day. This thing supports PCM 768kHz, DSD256, can you handle it?
Schematic AK4490 AK4118 QCC3034 Fiber coaxial Bluetooth audio DAC
The digital audio transceiver will use the same AK4118, perfectly supporting 192K 24bit audio sources.
This design reserves a Bluetooth module, also suitable for qcc3034. The i2s switch uses SN74HC157DR. The low-pass LPF section uses a very ordinary TI NE5532 operational amplifier, with single power supply mainly for convenience.
Most of the capacitors in this design are ordinary aluminum electrolytic, only the output capacitors use Elna audio non-polar capacitors.
The operational amplifier power supply part uses two Elna aluminum electrolytes. In addition, the author has to complain about Chengxing capacitors, the silkscreen on the surface comes off with a wipe of the board cleaning solution, so annoying…
For an audio decoder, the power supply of the small signal operational amplifier LPF is very, very critical, the noise must be minimal, in this design, a capacitor multiplier is added to the operational amplifier power supply.
Debugging testing The circuit is relatively simple, just configure it according to the manual. The LPF section can refer to the official manual. The testing video uses the SPDIF signal output from the Jian Wu CD player optical port, and the amplifier is the previously open-source tpa3126. With the volume at maximum, placing the ear close to the speaker, you can hardly hear any background noise.
BOM AK4490 AK4118 QCC3034 Fiber coaxial Bluetooth audio DAC
Parts | Value | Description | Quantity |
Capacitors | |||
C19,C106,C173,C228,C245,C247,C250,C253,C255,C256,C257,C260,C268,C274,C275 | 100nF | R0402 – SMD ceramic capacitor | 15 |
C22,C277 | 22uF | C0603 – SMD ceramic capacitor | 2 |
C219 | 22uF | C0805 – SMD ceramic capacitor | 1 |
C42,C43 | 220uF/50V | Electrolytic capacitor | 2 |
C88, C278 | 220uF/35V | Electrolytic capacitor | 2 |
C263, C264, C244 | 220uF/25V | Electrolytic capacitor | 3 |
C195,C246, C287, C281, C286, | 220uF/16V | Electrolytic capacitor | 5 |
C297 | 10uF | C0805 – SMD ceramic capacitor | 13 |
C126, C127, C205, C206, C249, C251, C252, C254, C266, C267, C295, C296, | 10uF | C402 – SMD ceramic capacitor | |
C233 | 470nF | R0402 – SMD resistor | 1 |
C234,C236,C237,C239 | 100pF | R0402 – SMD resistor | 4 |
C235,C238 | 390pF | R0402 – SMD resistor | 2 |
C240,C241 | 2200uF/25V | Electrolytic capacitor | 2 |
C248,C279,C284,C285 | 1uF | R0402 – SMD resistor | 4 |
C258,C259 | 12pF | R0402 – SMD resistor | 2 |
C282,C283 | 100uF/6.3V | Electrolytic capacitor | 2 |
C298 | 10pF | R0402 – SMD resistor | 1 |
Resistors | |||
R14,R19 | 100kΩ | R0402 – SMD resistor | 2 |
R15,R72,R196,R209 | 4.7kΩ | R0402 – SMD resistor | 4 |
R18 | 15kΩ | R0402 – SMD resistor | 1 |
R59 | 3.32kΩ | R0402 – SMD resistor | 1 |
R139 | 75Ω | R0603 – SMD resistor | 1 |
R157 | 2.7K | R1206 – SMD resistor | 1 |
R171,R189,R197,R202,R203,R206,R207,R208,R222 | 10kΩ | R0402 – SMD resistor | 9 |
R173,R176,R179,R182 | 3.3kΩ | R0402 – SMD resistor | 4 |
R174,R178,R180,R184 | 8.2kΩ | R0402 – SMD resistor | 4 |
R175,R177,R181,R183 | 6.2kΩ | R0402 – SMD resistor | 4 |
R185 | 680Ω | R0805 – SMD resistor | 1 |
R188 | 10K | R0402 – SMD resistor | 1 |
R190 | NC | R0402 – SMD resistor | 1 |
R191,R198,R200,R221 | 1kΩ | R0402 – SMD resistor | 4 |
R204,R205 | 470Ω | R0603 – SMD resistor | 2 |
R211 | 0Ω | R0402 – SMD resistor | 1 |
R212,R213,R214,R215,R216,R217,R218,R219,R220 | 22Ω | R0402 – SMD resistor | 9 |
Semiconductors | |||
D4 | SS14 | 40V 1A SMA(DO-214AC) Schottky Barrier Diode | 1 |
D5,D6 | 1N4148WS | 100V 4ns 150mA SOD-323 Switching Diode | 2 |
LED2 | MHL3014SRTS | LED 20mA Red 3 mm | 1 |
LED9 | OPT | LED 20mA Blue 3 mm | 1 |
LED10 | COAX | LED 20mA Green 3 mm | 1 |
LED11 | BLUE | LED 20mA Yellow 3 mm | 1 |
LED13 | SPDIF | LED 20mA Red 3 mm | 1 |
M1,M2 | 2N7002 | 60V 115mA NChannel SOT-23 MOSFET | 2 |
M3 | AO3401 | 30V 4.2A 65 mΩ PChannel SOT-23 MOSFET | 1 |
Q1 | 2SD667 | 80V 1A NPN TO-92-3 Transistor | 1 |
U6 | NE5532DR | Dual SOIC-8 Operational Amplifier | 1 |
U8,U30 | ME6231A33M3G | SOT-23 Linear Voltage Regulator | 2 |
U11 | SY8113IADC | TSOT-23-6 DC-DC Converter | 1 |
U29 | AN3034 | QCC3034 Bluetooth 5.0 module I2S IIS supports aptxHD aptX TWS mode Qualcomm Bluetooth | 1 |
U38 | AK4118AEQ | Transceiver LQFP-48(7×7) Audio Interface IC | 1 |
U39 | AK4490REQ | LQFP-48(7×7) Digital To Analog Converter | 1 |
U40 | CJ7805 | 1.5A 5V Positive TO-220 Linear Voltage Regulator | 1 |
U41 | SN74HC157DR | SOIC-16 Quadruple 2-Line To 1-Line Data Selectors/Multiplexers | 1 |
U47 | PLT133/T10W | Photo-link Light Transmitter Unit | 1 |
Miscellaneous | |||
F2 | F1206HI4000V032TM | SMD Fuse 4A 32V 1206 | 1 |
J1 | DC005 | Right-Angle DC Power Receptacle | 1 |
L1 | 4.7uH | 2A 4.7uH SMD, 2×2.5 mm Inductor | 1 |
L13 | 22uH | 540mA 22uH ±20% 2520 Inductor | 1 |
RF1 | BWIPX-1-001E | 1 Inner needle IPEX Board Edge SMD RF Connector | 1 |
SW1,SW2 | ST-0-102-C04-N008-RS | 125V SPDT Right-Angle 3A Plugin Toggle Switch | 2 |
AV1 | AV3-8.4-05 | RCA connector 3pin color | 1 |
BL1 | BLM15AG102SN1D | 650 mΩ 1 kΩ@100MHz 0402 Ferrite Bead | 1 |
X3 | 11.2896MHz | SMD3225-4P Crystal | 1 |
Download files, links, and notes
- Download PCB in Gerber + BOM + Centroid File
- Mirror
- PDF Datasheet IC AK4499 — Premium Switched Resistor 4ch DAC
- PDF Datasheet IC AK4118 — High Feature 192kHz 24bit Digital Audio I/F Transceiver
- PDF datasheet IC SY8113IADC
- PDF Datasheet IC ME6231
- PDF Datasheet IC NE5532
- PDF Datasheet QC3034
- Buy QCC3034 module
- Buy Aluminum Power Chassis Enclosure
- Buy AK4499
- Buy AK4118