【LM3914】10 level display

Introduction: A simple LM3914 level display

Schematic PCB

Guangzhou subway map

Introduction: A Guangzhou subway map

Schematic PCB

【Initial】NUCL-XHP70 moving light source

Introduction: LM3914 level display solution and NE555 PWM solution

Schematic PCB

K100-K375s left hand digital open source

Introduction: Left-hand digital area arrangement suitable for K100 kit

Schematic PCB

Bingdundun electronic business card with NFC

Introduction: Bingdundun pendant, with NFC, many authors use whiteboard and black screen printing, so we made a blackboard and white screen printing

Schematic PCB

17 small keyboard pattern bottom plate

Introduction: 17 keypad pattern bottom plate

Schematic PCB

【CW32】Xinyuan Brushless Motor Control V1.0

Introduction: Design of brushless motor control board based on Xinyuan microcontroller.

Schematic PCB

Intelligent monitoring system for electrical equipment completed

Introduction: Project Title: Design of Intelligent Monitoring System for Electrical Equipment

Schematic PCB

CH551 microcontroller HID three-button keyboard

Introduction: Adapted from the open source project: https://www.oshwhub.com/TheLight/zi-ding-yi-jian-pan Thanks to the boss of TheLight for the open source project.

Schematic PCB

15V Walkman 1

Introduction: 15v powered walkman speaker

Schematic PCB

[Verified] GL3224 chip usb3.0 card reader solution verification board

Introduction: Hello, stranger, this is a solution verification board that uses GL3224 (32-pin version) as a USB3.0 card reader. Currently, a TF card version is produced, and an SD card version may be released in the future. It has been verified that it is OK. use. I don’t know how to wire, so please spray lightly.

Schematic PCB

MAX9812 speech amplifier, pickup preamplifier

Introduction: Voice amplifier, pickup preamplifier, suitable for monitors, sound pickup and recording. It can be used when you need to hear small sounds in a noisy environment.

Schematic PCB

High and low level trigger optocoupler isolation relay module

Introduction: This 1-way relay module can be used in situations with large interference, ensuring that the relay will not affect the signal loop when switching. At the same time, it can also be freely switched to high-level drive mode or low-level drive mode. The use of Songle's high-quality relays ensures that the module has a long service life.

Lucky wheel lottery DIY production electronic 555 production

Introduction: The Lucky Wheel is a tool that predicts where the rotating disk will stop when it stops. It can also be used as a number estimation game, electronic dice, lottery machine, etc.

Adaptive 4A lithium battery charger CN3791 MPPT solar panel charger high power charging board module

Introduction: MPPT solar controller uses CN3791 chip, has large charging current and is relatively cheap. I bought it on Taobao for 1.5 yuan each. All other components were used on hand. The PCB has been proofed and verified, so you can refer to it with confidence.

Schematic PCB

Magnetic pole detector (pure hardware)

Introduction: A magnetic pole detector (pure hardware) used to detect the polarity of magnetic poles. It can detect the polarity of magnetic poles. The sensitivity is adjustable and can be adjusted to the highest level to detect the earth's magnetic field.

Schematic PCB

Repair and replacement cable for Toshiba U920t

Introduction: Replacement cables suitable for Toshiba U920t ultrabook. The original cables are not available. After three years, I finally lighted up my notebook.

Schematic PCB

CW brushless driver

Introduction: Originally, I wanted to make a brushless driver and use it together, but the core board was fine, and the driver stopped working after just using it for a while.

Schematic PCB

The stupidest hole board

Introduction: The first time I painted a perforated board using the stupidest method.

Schematic PCB

QZD electronic sheep

Introduction: Third Prize in the 2022 Guangzhou City Polytechnic School of Electrical Engineering Electrical and Electronic Breathing Lamp Design Competition

Schematic PCB