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4 layers74 × 36.3 mmLoudcardsdevice, the printed circuit board in 3D

Building a physical flashcard device inspired by Anki and spaced repetition.

Size
74 × 36.3 mm
Copper layers
4
Thickness
1.6 mm
Parts
87
Nets
59
Pads
271
Tracks, vias
427, 52
Pours
2
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
24 Oct 2025
Updated
23 May 2026

Overview

Loudcardsdevice is an open-source printed circuit board by gelotek-com, from the gelotek-com/Anki-In-Hardware repository on GitHub. It is a 4-layer board of 74 × 36.3 mm with 87 parts on 59 nets, routed with 427 tracks and 52 vias.

It is built around the ESP32-C3-WROOM-02-H4, TPA6132A2RTE and W25Q128JVSIQ, with the AMS1117-3.3, PCM5102APW and 0603B104K250CT among its other parts. Its parts include 29 capacitors, 24 resistors, 5 ICs, 5 diodes and 5 switches. It belongs with the ESP32 and RISC-V boards of this library.

Main components

12

README

README.md

Physical Anki Device

Building a physical flashcard device inspired by Anki and spaced repetition.

YouTube Series

Watch the full project here:
🎥 https://www.youtube.com/playlist?list=PLZI8gkIZC2W3yhb4EUrMZ4vrkucjjzuon

My website

My website for more details: https://gelotek.com/AIH/

Parts

87
QtyValueFootprintReferences
11TestPointTestPoint:TestPoint_Pad_1.0x1.0mmTP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11
100.1uCapacitor_SMD:C_0603_1608MetricC1, C2, C5, C6, C8, C9, C10, C15, C27, C29
710kResistor_SMD:R_0603_1608MetricR1, R2, R3, R4, R10, R11, R12
710uCapacitor_SMD:C_0603_1608MetricC4, C7, C13, C14, C17, C26, C28
71uCapacitor_SMD:C_0603_1608MetricC3, C19, C20, C21, C22, C24, C25
65.1kResistor_SMD:R_0603_1608MetricR5, R14, R15, R22, R23, R24
5SW_PushButton_Switch_THT:SW_PUSH_6mmSW1, SW2, SW3, SW4, SW5
450Resistor_SMD:R_0603_1608MetricR6, R7, R8, R9
4LEDLED_SMD:LED_0603_1608MetricD1, D2, D3, D4
4MountingHoleMountingHole:MountingHole_2.1mmH1, H2, H3, H4
32.2uCapacitor_SMD:C_0603_1608MetricC11, C12, C23
322Resistor_SMD:R_0603_1608MetricR16, R17, R18
2100kResistor_SMD:R_0603_1608MetricR13, R21
22.2nCapacitor_SMD:C_0603_1608MetricC16, C18
2470Resistor_SMD:R_0603_1608MetricR19, R20
15V, 1200W TVSDiode_SMD:D_SOD-323FD5
1600Ω @ 100MHzSize 0805 preferred for audio rails.Inductor_SMD:L_0805_2012MetricFB1
1AMS1117-3.3Package_TO_SOT_SMD:SOT-223-3_TabPin2U5
1AudioJack4Connector_Audio:Jack_3.5mm_PJ320D_HorizontalJ2
1Conn_01x04Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_VerticalJ1
1ESP32-C3-WROOM-02RF_Module:ESP32-C3-WROOM-02U1
1PCM5102APackage_SO:TSSOP-20_4.4x6.5mm_P0.65mmU3
1TPA6132A2RTEPackage_DFN_QFN:WQFN-16-1EP_3x3mm_P0.5mm_EP1.6x1.6mm_ThermalViasU4
1USB_C_Receptacle_PowerOnly_6PConnector_USB:USB_C_Receptacle_GCT_USB4125-xx-x-0190_6P_TopMnt_HorizontalJ3
1W25Q128JVSPackage_SO:SOIC-8_5.3x5.3mm_P1.27mmU2

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Questions

How big is the Loudcardsdevice PCB?

It measures 74 × 36.3 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Loudcardsdevice use?

87 parts, built around the ESP32-C3-WROOM-02-H4, TPA6132A2RTE, W25Q128JVSIQ and AMS1117-3.3. 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 Loudcardsdevice KiCad files?

From the gelotek-com/Anki-In-Hardware repository on GitHub, at the commit this page was made from: the board is PCB_Files/loudcardsdevice.kicad_pcb and its schematic PCB_Files/5VPowerSupply.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Loudcardsdevice design in my own project?

Its repository states no licence, so its author keeps all rights: ask gelotek-com before reusing the design.