4 layers76.8 × 56.5 mm Dac, the printed circuit board in 3D

Dac

misc electronic projects

Size: 76.8 × 56.5 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 86
Nets: 65
Pads: 293
Tracks, vias: 554, 116
Pours: 2
Routed: Yes
KiCad: KiCad 5 (file 20171130)
Created: 6 Oct 2020
Updated: 31 Oct 2026

Overview

Dac is an open-source printed circuit board by schenkmi, from the schenkmi/electronic-projects repository on GitHub, published under the CERN-OHL-W-2.0 licence. It is a 4-layer board of 76.8 × 56.5 mm with 86 parts on 65 nets, routed with 554 tracks and 116 vias.

It is built around the PIC16F18446-I/SO, 74LVC1G125 and PL133-37TI-R, with the TLV1117-33DCY and 1N4148W among its other parts. Its parts include 33 capacitors, 17 resistors, 12 ICs, 9 connectors and 5 diodes. It belongs with the audio and music boards and the PIC boards of this library.

Main components

README

README.md

electronic-projects

misc electronic projects

History

2026.09.19

pre-amp-ECC86/kicad/psu-v6

Large PCB PSU for ECC86 with high side switch. Support LT3080 and LM317. Fix Drain/Source.

2026.09.02

pre-amp-ECC86/kicad/psu-v5

Large PCB PSU for ECC86 with high side switch. Support LT3080 and LM317

2026.08.26

pre-amp-ECC86/kicad/psu-v4

Large PCB PSU for ECC86 without relais. Support LT3080 and LM317

2026.08.23

input-sel-attenuator/software/v9

Power up timer to 64ms wait till voltage is stabilized

2026.08.10

pre-amp-ECC86/kicad/psu-v3

Large PCB PSU for ECC86

2026.08.01

pre-amp-ECC86/kicad/psu-v2

Shrinked and optimized PSU for ECC86

2026.07.22

pre-amp-ECC86/kicad/psu-v1

First version of PSU for ECC86

2026.07.12

pre-amp-ECC86/kicad/v1

First version of ECC86 based pre-amplifier

spdif-recv-ak4118-ak4137/software/spdif-recv-ak4118-ak4137-v4.X

Updated software for V4 PCB

2026.06.05

dac-pcm1702-v1/kicad-psu-v8/

DC/DC for +5V digital path

dac-pcm1702-v1/kicad-asrc-v14

PCB LED fix External LED support

spdif-recv-ak4118-ak4137/kicad/v4

External LED support Change one LDO to TLV1117-3.3 due to power dissipation

2026.05.28

dac-pcm1702-v1/kicad-asrc-v13

PCB re-design with fixed LED ordering

2026.05.27

pre-amp-26A7/ltspice/v2/

New CCS simulation with smaller FETs

2026.05.26

dac-pcm1702-v1/software/spdif-recv-asrc-4392-v12.X

New software for SPDIF ASRC receiver including UART and IR

2026.05.16

dac-pcm1702-v1/kicad-asrc-v12

PSU re-design, UART for debugging, I2C debugging, IR

spdif-recv-ak4118-ak4137/kicad/v3

Add IR support

2026.05.10

spdif-recv-cs8416-ak4137/kicad/v7

Improved power supply, I2S debug, Serial console

spdif-recv-ak4118-ak4137/kicad/v2

Small redesign

2026.04.25

spdif-recv-ak4118-ak4137/kicad/v1

Finalize and ordered

pre-amp-26A7/kicad/v2

Finalize and ordered

2026.03.29

pre-amp-26A7/kicad/v1

Finalize and ordered v1

2026.03.28

lv-psu-dcdc/kicad/fixed-v3

Better thermal management for DC/DC

lv-lownoise-psu/kicad/v7-dcdc-large-cap

Better thermal handling on DC/DC

input-sel-attenuator/kicad/v9-10k-47k

Changed footprint for L1 and C1

2026.03.11

lv-psu-dcdc/kicad/fixed-v2

Eval board with different inductors

hv-psu-discrete/kicad/maida-lt3080-v5

HV PSU with DC/DC for +5V output

2026.03.05

lv-lownoise-psu/kicad/v6-dcdc-large-cap

Finalize v6 with large reservoir cap

2026.02.25

hv-psu-discrete/kicad/maida-lt3080-v5-26A7GT

HV PSU for 26A7 pre-amp

2026.01.13

input-sel-attenuator/software/ir-debug-v3

Update MCC generated code

dac-pcm1792a/software/asrc-pcm1792a-v4.X

Update MCC generated code

dac-pcm1702-v1/software/v8

Update MCC generated code

spdif-recv-cs8416-ak4137/software/spdif-recv-cs8416-ak4137-v5.X

Update MCC generated code

input-sel-attenuator/software/v9

Update MCC generated code

rpi-hat-spdif/kicad/V9

RPI HAT SPDIF Output increase hole diameter to 3.2mm

rpi-hat-spdif/kicad/V9-min

RPI HAT SPDIF Output minized PCB increase hole diameter to 3.2mm

2026.01.01

adapter/spdif/kicad/v2

LVDS SPDIF XMIT with rotated connector

adapter/spdif/kicad/v2b

LVDS SPDIF XMIT with standard connector

rpi-hat-spdif/kicad/V7-min

RPI HAT SPDIF Output minized PCB

rpi-hat-spdif/kicad/V8

RPI HAT SPDIF Output new PCB

2025.12.20

adapter/spdif/kicad/v1

Finalize v1 LVDS SPDIF XMIT

rpi-hat-spdif/kicad/v6

RPI HAT SPDIF Output

rpi-hat-spdif/kicad/v6-min

RPI HAT SPDIF Output minimized

2025.12.08

pre-amp-ECC88/kicad/v9

Finalize and ordered v9

2025.09.29

retro/c64-user-port-led

Finalize v1 of C64 user port LED

2025.09.28

dac-pcm1704/kicad/dac-df1706-pcm1704-v2

Finalize and ordered v2

2025.09.21

dac-pcm1704/kicad/dac-pcm1704-v5

Finalize and ordered v5

dac-pcm1702-v1/kicad-i2s-nos-v7

Finalize and ordered v7

dac-pcm1792a/kicad/v6/

Finalize and ordered v6

2025.09.13

input-sel-attenuator/software/ir-debug-v2

input-sel-attenuator/software/v8

V2.5 2025.09.12 Shiny new push button and saving handling Use volume when doing channel switch.

2025.09.07

lv-lownoise-psu/kicad/v5-dcdc

Finalize and ordered v5

lv-lownoise-psu/kicad/v5-dcdc-large-cap

Finalize and ordered v5 with large reservoir cap

2025.08.25

lt1115-phono-mm-mc/kicad/v6

Finalize and ordered v6

2025.08.23

dac-pcm1702-v1/kicad-psu-v7

Finalize and ordered v7

Parts

Qty	Value	Footprint	References
19	100nF	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C1, C2, C3, C4, C5, C6, C13, C14, C15, C16, C17, C25, C26, C28, C29, C33 +3
5	10uF	Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B_Pad1.50x2.35mm_HandSolder	C10, C11, C12, C23, C24
5	4K99	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R7, R8, R16, R17, R22
4	330R	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R2, R3, R14, R15
4	LED	LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder	D1, D2, D4, D5
4	MountingHole	MountingHole:MountingHole_3.2mm_M3	H1, H2, H3, H4
3	30pF	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C30, C31, C32
3	47uH	Inductor_SMD:L_0805_2012Metric_Pad1.05x1.20mm_HandSolder	L1, L2, L3
3	74LVC1G125	Package_TO_SOT_SMD:SOT-353_SC-70-5_Handsoldering	U4, U7, U12
3	PLR135-T10	kicad-snk:PLR135-T10_PLT133-T10W	U1, U2, U9
2	0R	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R4, R20
2	100nF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C21, C22
2	330nF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C19, C20
2	4k99	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R1, R13
2	NC	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R19, R23
1	+5VIN	Connector_Pin:Pin_D1.0mm_L10.0mm	J16
1	100uF	Capacitor_THT:CP_Radial_D8.0mm_P3.50mm	C18
1	10nF	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C27
1	1N4148W	Diode_SMD:D_SOD-123	D6
1	1k	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R12
1	75R	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R6
1	A	kicad-snk:TE_CONN_RCPT_10POS_0.1_TIN_PCB	J15
1	ASDMB-xxxMHz	Oscillator:Oscillator_SMD_EuroQuartz_XO91-4Pin_7.0x5.0mm_HandSoldering	U8
1	B	kicad-snk:TE_CONN_RCPT_10POS_0.1_TIN_PCB	J10
1	COAXGND	Connector_Pin:Pin_D1.0mm_L10.0mm	J8
1	COAXIN	Connector_Pin:Pin_D1.0mm_L10.0mm	J5
1	Conn_01x06_Male	Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical	J1
1	Ferrite_Bead_Small	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	FB1
1	GND	Connector_Pin:Pin_D1.0mm_L10.0mm	J17
1	IN	kicad-snk:TE_CONN_RCPT_10POS_0.1_TIN_PCB	J6
1	Murata_DA103	kicad-snk:DA100J	T1
1	PIC16F18446-I/SO	Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm	U5
1	PL133-37TI-R	Package_TO_SOT_SMD:SOT-23-6	U6
1	SEL	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J7
1	SRC4382/SRC4392	Package_QFP:TQFP-48_7x7mm_P0.5mm	U3
1	SolderJumper_3_Bridged12	Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm_NumberLabels	JP1
1	TLV1117-18	Package_TO_SOT_SMD:SOT-223-3_TabPin2	U11
1	TLV1117-33	Package_TO_SOT_SMD:SOT-223-3_TabPin2	U10

Questions

How big is the Dac PCB?

It measures 76.8 × 56.5 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Dac use?

86 parts, built around the PIC16F18446-I/SO, 74LVC1G125, PL133-37TI-R and TLV1117-33DCY. 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 KiCad files?

From the schenkmi/electronic-projects repository on GitHub, at the commit this page was made from: the board is dac-pcm1702-v1/kicad-asrc-v6/dac.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Dac design in my own project?

Its repository publishes it under the CERN-OHL-W-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

Audio and music PIC

Topics

amplifier audio diy electronics hifi kicad microchip-pic tube

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/schenkmi-electronic-projects-dac" title="Dac in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/schenkmi-electronic-projects-dac.jpg" alt="Dac" width="1200" height="900">

A picture that opens the board, for a README

[![Dac](https://pcbkit.io/embed/boards/schenkmi-electronic-projects-dac.jpg?size=s)](https://pcbkit.io/boards/schenkmi-electronic-projects-dac)

Source

Repository: schenkmi/electronic-projects
Board file: dac-pcm1702-v1/kicad-asrc-v6/dac.kicad_pcb
Commit: 8d54cdf
Licence: CERN-OHL-W-2.0
Copies: 2 copies in 1 repository

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