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2 layers64 × 109.5 mmDapt, the printed circuit board in 3D

Dapt

JBlitzar/dapt

usb adapters

Open in PCBKitView on GitHub.kicad_pcb
Size
64 × 109.5 mm
Copper layers
2
Thickness
1.6 mm
Parts
42
Nets
82
Pads
314
Tracks, vias
487, 42
Pours
22
Routed
Yes
KiCad
KiCad 10.0 (file 20260206)
Created
11 Jul 2026
Updated
17 Aug 2026

Overview

Dapt is an open-source printed circuit board by JBlitzar, from the JBlitzar/dapt repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 64 × 109.5 mm with 42 parts on 82 nets, routed with 487 tracks and 42 vias.

It is built around the MF1/4W-5.1KΩ±1%T52, GT-USB-7035A and AM90, with the MC-337 and USB3150-30-130-A among its other parts.

Main components

5

README

README.md

dapt

[Please read] About cost.

So looking at the bom, you can see that it's super expensive, like $50. You might be thinking, "what's going on there? I thought this project was explicitly focused on being low-cost!"

There are a few points I'd like to preempt.

  1. I'm not going to spend $50 building this, and if I do so it'll be fine because I can pay out of pocket. That's the BOM for the souped-up set of ALL the adapters in large quantities. I'm going to pick and choose which ones to do, and do it in small quantities. I'm going to end up paying like $15 personally.
  2. There's not really a way to BOM-optimize. Contention genuinely is really high, because LCSC doesn't specialize in THT hobby-solderable components. USB-C SMD genuinely cannot be hand-soldered without a hot plate. If you're trying to make 100 of these, please just buy PCBA and get dirt-cheap SMD components. Right now THT pricing is hit-or-miss. Some are dirt cheap, others are not.
  3. I could swap everything out for SMD and order PCBA myself, but at that point it's genuinely a different project. This is what there is.

Images

There are no other enclosures, so this is the 3D model too. A STEP export is at dapt.step

What is this project?

dapt is a family of USB adapters.

There are some opinionated choices that were made:

  • Fully passive and chipless. This means that it's just the bare USB protocol: GND, VCC, D+, D-. This also means that you lose out on PD and USB3.0. It's out of scope, but it's what makes this so universal. The only component other than the connectors are some 5.1k resistors that are required for all USB-C to work.
  • tht (for now). This is so that it's hand-solderable.
  • just USB. It doesn't try to do too much.

I made dapt because I wanted some dead-simple USB adapters, and I thought it'd be a fun project.

Current adapters:

  • A female to A female
  • A female to C male
  • A male to A male
  • A male to C female
  • C female to C female
  • C female to micro male

Schematics

VariantSchematic
A female to A femaleA female to A female schematic
A female to C maleA female to C male schematic
A male to A maleA male to A male schematic
A male to C femaleA male to C female schematic
C female to C femaleC female to C female schematic
C female to micro maleC female to micro male schematic

PCB

VariantFrontBack
A female to A femaleA female to A female PCB frontA female to A female PCB back
A female to C maleA female to C male PCB frontA female to C male PCB back
A male to A maleA male to A male PCB frontA male to A male PCB back
A male to C femaleA male to C female PCB frontA male to C female PCB back
C female to C femaleC female to C female PCB frontC female to C female PCB back
C female to micro maleC female to micro male PCB frontC female to micro male PCB back

Production files

in PCB/exported_variants/gerbers. A bit unique because this is multiple boards/variants in one.

BOM

Please see the about cost section.

Itemlinkqtyextended pricenotes
C male A female boardN/A205.1
A male A male boardN/A54.2
C female C female boardN/A52.1
A male C female boardN/A105.2
C female micro male boardN/A105.5
USB A malehttps://www.lcsc.com/product-detail/C404965.html?s_z=n_q_C404965&globalKeyword=C404965151.33
USB A femalehttps://www.lcsc.com/product-detail/C456018.html?s_z=n_q_C456018&globalKeyword=C456018200.97
USB C malehttps://www.lcsc.com/product-detail/C22355747.html?s_z=n_q_C22355747&globalKeyword=C22355747205.85
USB C femalehttps://www.lcsc.com/product-detail/C22384780.html?s_z=n_q_C22384780&globalKeyword=C22384780308.53
micro malehttps://www.lcsc.com/product-detail/C7407276.html?s_z=n_q_C7407276&globalKeyword=C74072761011.75
lcsc + jlc shippingN/A10shipping free bc imma order it with other stuff
totalN/A150.53

Parts

42
QtyValueFootprintReferences
20MF1/4W-5.1KΩ±1%T52easyeda2kicad:RES-TH_BD2.3-L6.5-P10.50-D0.5R5, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24 +4
6AF 90° WJDGeasyeda2kicad:USB-A-TH_AF-WJDGUSB9, USB10, USB13, USB16, USB17, USB21
6GT-USB-7035Aeasyeda2kicad:TYPE-C-TH_GT-USB-7035AUSB6, USB14, USB18, USB19, USB22, USB24
4AM90easyeda2kicad:USB-AM-TH_AM90USB4, USB5, USB15, USB25
4MC-337easyeda2kicad:USB-C-SMD_14P-P0.80_MC-337USB7, USB8, USB11, USB20
2USB3150-30-130-Aeasyeda2kicad:USB-B-TH_USB3150-30-130-AUSB12, USB23

Questions

How big is the Dapt PCB?

It measures 64 × 109.5 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Dapt use?

42 parts, built around the MF1/4W-5.1KΩ±1%T52, GT-USB-7035A, AM90 and MC-337. 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 Dapt KiCad files?

From the JBlitzar/dapt repository on GitHub, at the commit this page was made from: the board is PCB/dapt/dapt.kicad_pcb and its schematic PCB/dapt/A_female_A_female.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Dapt design in my own project?

Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

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