2 layers142 × 160 mm
2 layers193 × 160 mm
Dac circ
b3dag/r2r-DAC- Size
- 193 × 160 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 149
- Nets
- 157
- Pads
- 498
- Tracks, vias
- 684, 37
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 17 Jul 2026
- Updated
- 17 Jul 2026
Overview
Dac circ is an open-source printed circuit board by b3dag, from the b3dag/r2r-DAC repository on GitHub. It is a 2-layer board of 193 × 160 mm with 149 parts on 157 nets, routed with 684 tracks and 37 vias.
It is built around the NE5532, 74HC164 and 74HCT574D, with the 74HC04D, 74HC11D and L7805 among its other parts. Its parts include 82 resistors, 31 capacitors, 17 ICs, 8 diodes and 5 connectors. It belongs with the audio and music boards of this library.
Main components
9
NE5532
SOP-8-22V~22V 0℃~+70℃ 100dB 10nA 14mA 2 40V/us 42mA 4mV 800nA 8nV/√Hz@30Hz Built-in compensation SOP-8 Operational Amplifier ROHSSungineOperational Amplifier
74HC164
SOP-140℃~+70℃ 1 24ns@5V,16pF 2V~6V 74HC 8 Serial-to-Parallel SOP-14 Shift Registers ROHSGRShift Registers
74HCT574D
SO-20-300mil-40℃~+125℃ 1 18ns@4.5V,50pF 3.5pF 3ns 4.5V~5.5V 5ns 69MHz 6mA 6mA 74HCT Series 8 8uA D-Type Rising Edge Tri-State SOIC-20-300mil Flip Flops ROHSNexperiaFlip Flops74HC04D
SOP-14-40℃~+125℃ 1 1.5V~4.2V 1.9V、3.7V、5.2V 100mV、400mV、400mV 14ns@6V,50pF 2V~6V 2uA 5.2mA 5.2mA 500mV~1.8V 6 74HC SOIC-14 Inverters ROHSNexperiaInverters74HC11D
SOP-14-40℃~+125℃ 1.5V~4.2V 1.9V、4.4V、5.9V 100mV、100mV、100mV 17ns@6V,50pF 2V~6V 2uA 3 3 5.2mA 5.2mA 500mV~1.8V 74HC Series AND Gate SOP-14 Logic Gates ROHSNexperiaLogic Gates
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
L7812
TO-220ST0℃~+125℃@(Tj) 1 1.2A 12V 2V@(1A) 30V 71dB@(120Hz) 76uV Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
L7912
TO-220ST0℃~+125℃@(Tj) 1 1.2A 12V 200uV 2V@(1A) 35V 3mA 60dB@(120Hz) Fixed Negative Over Voltage Protection、Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BC517
TO-9230V 1A NPN Silicon Darlington TransistoronsemiUncategorised
README
README.mdr2r-DAC
DIY r2r dac using i2s wich get converted by another board.
Parts
149| Qty | Value | Footprint | References |
|---|---|---|---|
| 34 | 20k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3, R10, R11, R12, R13, R14, R15, R16, R17, R26, R34, R35, R36, R37 +18 |
| 32 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R18, R19, R20, R21, R22, R23, R24, R25, R27, R28, R29, R30, R31, R32, R33, R50 +16 |
| 17 | 100nf | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C7, C8, C10, C11, C12, C13, C14, C15, C16, C17, C20, C21, C22, C23, C24, C25 +1 |
| 5 | 74HC164 | Package_DIP:DIP-14_W7.62mm | U3, U4, U5, U6, U7 |
| 4 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D5, D6, D7, D8 |
| 4 | 1nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C2, C3, C5, C6 |
| 4 | 330uF | Capacitor_THT:CP_Radial_D12.5mm_P5.00mm | C26, C27, C28, C29 |
| 4 | 74HCT574 | Package_DIP:DIP-20_W7.62mm | U8, U9, U12, U13 |
| 4 | 8.2k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R65, R66, R71, R72 |
| 3 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R80, R81, R82 |
| 3 | 47k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R67, R70, R75 |
| 3 | NE5532 | Package_DIP:DIP-8_W7.62mm | U10, U11, U14 |
| 2 | 100r | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R76, R78 |
| 2 | 10k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1, RV2 |
| 2 | 10uf | Capacitor_THT:C_Radial_D5.0mm_H11.0mm_P2.00mm | C18, C19 |
| 2 | 1N4007 | Diode_THT:D_A-405_P7.62mm_Horizontal | D1, D2 |
| 2 | 2.2uF | Capacitor_THT:C_Radial_D5.0mm_H11.0mm_P2.00mm | C1, C4 |
| 2 | 2200uF | Capacitor_THT:CP_Radial_D12.5mm_P5.00mm | C30, C31 |
| 2 | 330r | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R77, R79 |
| 2 | 5.9k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R69, R74 |
| 2 | LED | LED_THT:LED_D5.0mm | D3, D4 |
| 1 | 74HC04 | Package_DIP:DIP-14_W7.62mm | U1 |
| 1 | 74HC11 | Package_DIP:DIP-14_W7.62mm | U2 |
| 1 | BC517 | Package_TO_SOT_THT:TO-92L_HandSolder | Q1 |
| 1 | Conn_01x01_Pin | Connector_Wire:SolderWire-0.5sqmm_1x01_D0.9mm_OD2.1mm | J4 |
| 1 | Conn_01x02_Pin | Connector_Wire:SolderWire-0.5sqmm_1x02_P4.6mm_D0.9mm_OD2.1mm | J5 |
| 1 | Conn_01x06_Pin i2s | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1 |
| 1 | Conn_Coaxial L | Connector_Wire:SolderWire-0.25sqmm_1x02_P4.5mm_D0.65mm_OD2mm | J3 |
| 1 | Conn_Coaxial R | Connector_Wire:SolderWire-0.5sqmm_1x02_P4.6mm_D0.9mm_OD2.1mm | J2 |
| 1 | Fuse | Fuse:Fuseholder_Clip-5x20mm_Littelfuse_111_Lateral_P18.80x5.00mm_D1.17mm_Horizontal | F1 |
| 1 | G5V-2_Split | Relay_THT:Relay_DPDT_Omron_G5V-2 | K1 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabUp | U15 |
| 1 | L7812 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabUp | U16 |
| 1 | L7912 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabUp | U17 |
| 1 | ~ | FS24-500-C2:TRANSFORMER_FS24-500-C2 | T1 |
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Questions
How big is the Dac circ PCB?
It measures 193 × 160 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Dac circ use?
149 parts, built around the NE5532, 74HC164, 74HCT574D and 74HC04D. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Dac circ KiCad files?
From the b3dag/r2r-DAC repository on GitHub, at the commit this page was made from: the board is dac circ/dac circ.kicad_pcb and its schematic dac circ old/dac circ.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Dac circ design in my own project?
Its repository states no licence, so its author keeps all rights: ask b3dag before reusing the design.