AK4490 AK4118 QCC3034 Fiber Coaxial Bluetooth Audio DAC

Table of Contents

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

Schematic Ak4118 Fiber Coaxial Bluetooth Audio Dac — schematic AK4118 Fiber coaxial Bluetooth audio DAC

Schematic Power Supply Fiber Coaxial Bluetooth Audio Dac — schematic power supply Fiber coaxial Bluetooth audio DAC

Schematic Qcc3034 Fiber Coaxial Bluetooth Audio Dac — schematic 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