IP5506 portable power bank

PDF_Portable Power Bank Based on IP5506.zip

Altium_IP5506-based portable power bank.zip

PADS_IP5506-based Portable Power Bank.zip

BOM_Portable Power Bank Based on IP5506.xlsx

97373

Redmi power supply board has onboard U2C

Powered by Redmi 2, automatically powers on upon power-up, and features an OTG 3-in-1 board. Provides wide voltage input support from 10~28V. Includes USB 2.0 docking station functionality and CAN bus, allowing for independent U2C firmware updates.

Overview: This document
adds CAN bus support to the "Redmi 2 Direct Power OTG Automatic Power-On Three-in-One Board," and supports independent USB updates for CAN firmware and KLIPPER. It uses a reversible Type-C connector for update selection, automatically entering OTG mode without requiring a DIP switch.
Update Process:
 

Klipper Update


1. Put the phone into FASTBOOT mode, connect the Type-C cable, and use the Klipper firmware flashing software to check the phone's connection status. If the phone is not recognized, rotate the Type-C connector and continue connecting. The phone will be correctly recognized, and then Klipper can be flashed.

CAN Update

1. Power on the power board and connect the Type-C cable
. 2. Press and hold the red button for one second, then release.
3. Go to the upgrade website Updater - CANable
. 4. Select the version and firmware, and click Firmware Upgrade.
5. If the device is not recognized, reverse the Type-C connector and reinsert it, repeating steps 2-4.
Notes:
1. In the schematic diagram, R15, C15, R14, R16, R13, and U12 represent an alternative chip scheme. Choose one of them, along with U11.
2. Select the appropriate button height based on the case height.
3. It is recommended that the following ports be exposed outside the case: USB port, Type-C port, buttons, CAN bus port, and power port.
4. The fan port is for heat dissipation.
5. Choose any PCB that's free; 1.6mm thick, everyone knows that!
6. Ensure the board fits snugly against the phone case during installation to prevent it from being pulled out when plugging/unplugging the Type-C port during firmware updates.
Follow-up
: 1. Please refer to the detailed Klipper configuration yourself. The matching CAN head board is currently being tested. Alternatively, you can choose a commercially available CAN tool board for connection.
2. Due to time constraints, I will not create a group to answer questions. Instead, I recommend the technical exchange group: 883298710.
Thanks to
umekoko.
 
 

PDF_Redmi Power Supply Board Onboard U2C.zip

Altium_Redmi Power Supply Board Onboard U2C.zip

PADS_Redmi Power Supply Board Onboard U2C.zip

BOM_Redmi Power Supply Board Onboard U2C.xlsx

97374

USTC Campus Card

The school badge-style student ID card incorporates campus elements, making it both attractive and practical.

The circuit diagram uses the electromagnetic effect of a coil to make the smart card chip work. It's worth noting that the schematic diagram is just a model drawn to pass the review process and has no practical significance.
 

PDF_USTC Campus Card.zip

Altium_USTC Campus Card.zip

PADS_USTC Campus Card.zip

BOM_USTC Campus Card.xlsx

97376

NFC electronic business card

The NFC business card designed with NXP's NT3H1101W0FHKH is a perfect match for color silkscreen printing.

This design was completed under the guidance of Bilibili influencer "China's Slash Youth";
the circuit requires very few components and is easy to draw.
 

PDF_NFC Electronic Business Card.zip

Altium_NFC Electronic Business Card.zip

PADS_NFC Electronic Business Card.zip

BOM_NFC Electronic Business Card.xlsx

97377

3-cell 18650 lithium battery charging board

This lithium battery boost chip, based on Injoinic's IP2326, provides fast charging of three-cell lithium batteries at approximately 15W and supports low-voltage trickle charging to activate the batteries.

The circuit is very simple and only requires resistors, capacitors, and inductors. 

PDF_3-cell 18650 lithium battery charging board.zip

Altium 3-cell 18650 lithium battery charging board.zip

PADS_3-cell 18650 lithium battery charging board.zip

BOM_3-cell 18650 lithium battery charging board.xlsx

97378

Z-Core

Based on the Allwinner V851S core board, the schematic diagram is based on @YuzukiTsuru's Yuzuki PI. Special thanks to group member @fawen for testing and support.

1. When prototyping, choose JLC7628 impedance and 0.8mm thickness (important). If you want a free sample, 1.0mm thickness is also acceptable.
2. Those with ample funds can choose immersion gold plating.
3. For those with deep pockets, JLCPCB SMT process is recommended (if you're doing immersion gold plating + SMT, send me a sample, I'd be extremely grateful :)).
4. Baseboard: V851s-ext - JLCPCB EDA open-source hardware platform (oshwhub.com)
5. Interface: NGFF M.2 E-Key
6. The two capacitors on the back of the board can be omitted; it won't affect functionality.