HardLabs

J2o Board

JJaroll·MacBerry-Pi·originales/placas_kicad_originales_usuario/imac_g3_333mhz_slot_loading_J20_adapter_board.kicad_pcb

J2o Board layout, top view — open source AVR/Arduino board by JJaroll

About the J2o Board

J2o Board is an open source AVR/Arduino PCB design by JJaroll, published on GitHub under the LGPL-3.0 license. It is a 2-layer board measuring 82.6 × 52.5 mm, with 16 components from 11 distinct parts.

Its main chip is the ATmega328-PU, from the AVR/Arduino family. Other key parts include the LCC110. By type, the board carries 4 connectors, 4 resistors, 3 capacitors, 2 ICs, 2 diodes and 1 crystal.

It belongs with the dev boards & breakouts and retro computing designs in this gallery.

From the project

Mod del iMac G3 slot-loading (M5521) con Raspberry Pi 5: PCB maestra unificada, placas individuales (J20, J22, Down Converter), bezel interior y visores 3D. Todo en español.

Convierte un iMac G3 DV (slot loading) en un equipo moderno: una Raspberry Pi 5 dentro de la carcasa que usa el tubo CRT original como monitor VGA, con sus altavoces y su botón de encendido. Reversible: no hay que cortar nada del iMac.

Este repositorio reúne la documentación en español, las tres placas del proyecto original traducidas, un PCB master unificado que reemplaza el cableado entre ellas, y visores 3D (HTML autónomo y STL) para revisarlo todo sin instalar nada.

Main components on the J2o Board

ATmega328-PULCC110

J2o Board bill of materials (BOM)

16 components, 11 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATmega328-PU
U1
1
LCC110
U2
1
Crystal
Y1
1
Screw_Terminal_01x06
J1
1
Conn_02x10_Odd_Even
J2
2
Conn_02x03_Odd_Even
J3, J5
2
D_Schottky_ALT
D1, D2
2
22pF
C1, C2
1
470uF
C3
3
10k
R1, R2, R3
1
220
R4

J2o Board design files

The KiCad project lives in the JJaroll/MacBerry-Pi repository on GitHub; these links point at the commit this page was built from.

J2o Board: common questions

What microcontroller does the J2o Board use?

The J2o Board is built around the ATmega328-PU, from the AVR/Arduino family.

How big is the J2o Board?

The J2o Board measures 82.6 × 52.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the J2o Board?

16 components, from 11 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the J2o Board design files?

From the JJaroll/MacBerry-Pi repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the J2o Board design in my own project?

Yes, under the terms of its LGPL-3.0 license, which JJaroll chose for the repository.

Can I test firmware for the J2o Board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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