Open source audio amplifier

The power supply has a stable symmetrical +/- 40 V to ensure optimal performance.
Maximum power (THD 1%) approaches 100 W into 8 Ω load and 190 W into 4 Ω load (see measurements). All parts are through-hole, making it easy to build the amplifier. The design is completely symmetrical.

Schematic PCB

E-books based on Raspberry Pi microcontroller

This time it’s an e-book based on the Raspberry Pi.

Schematic PCB

OPen Book: a fully open source e-book that supports all languages ​​and breaks down working principles (schematics, PCB, source code, etc.)

Open Book is an open hardware device for reading books in all languages ​​of the world. It includes a large screen and navigation buttons, as well as audio options for accessibility and ports to expand its functionality. Its fine screen printing aims to demystify Open Book's own design, breaking down for curious readers how the book works and how they can create one for themselves.

Schematic PCB

Automatic doorbell with object detection

Every house has a doorbell. When a visitor arrives at a home, he looks for the doorbell switch and rings it to let us know his presence. What if a person coming to your home cannot find the doorbell, or the person is too short to reach the doorbell? The object detection circuit installation below is for reference. The circuit will automatically sense the presence of a person and ring the doorbell.

Teacher ChaN’s headphone amplifier design

Teacher ChaN’s headphone amplifier design

Schematic PCB

Open source wearable watch (including firmware, schematics and 3D printing diagrams)

This smartwatch can measure linear acceleration, rotational speed, heart rate and SpO2 (oxygen saturation) of the hand

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usb keyboard and mouse dual use source code

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Microcontroller hand-mounted fan C source code and schematic diagram.rar

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12f629 microcontroller decodes KEELOG source code, commonly used remote control rolling codes

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51+sl811 source program + schematic diagram for reading and writing U disk

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MP3 player source code schematic diagram using STC12C5A60S2

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5509A recording schematic diagram

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TEA1721 Universal Mains White Goods Flyback SMPS Demonstration Board

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LPCXpresso43S67 development board

The LPCXpresso family provides a powerful and flexible development system for NXP Cortex-M microcontrollers. The LPCXpresso43S67 board was developed by NXP to enable evaluation and prototyping of the LPC4300 series MCUs, featuring the LPC43S67 in a 100-pin BGA package. LPCXpresso™ is a low-cost development platform provided by NXP that supports NXP's Arm-based microcontrollers. The platform includes a simplified Eclipse-based IDE and low-cost target boards with a JTAG debugger. LPCXpresso is an end-to-end solution that supports embedded engineers developing applications from initial evaluation to final production.

Schematic PCB

PCT2075DP Arduino expansion board with temperature sensor function

The PCT2075DP Arduino Shield has most temperature sensor functionality on a board compatible with the Arduino R3 pinout. The graphical interface allows the user to easily explore the different functions of the temperature sensor. In addition, users can find embedded drivers and demo applications as reference code to get started quickly.

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NHS3100 Starter Kit for Treatment Adherence

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BGU7031 Evaluation Board for Set Top Box Low Noise Amplifier

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BGA3012 Demonstration Board, 5 MHz to 300 MHz 12 dB Gain Inverting Amplifier Application

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BGA3012 Demonstration Board, 40 MHz to 1006 MHz Push-Pull Amplifier Application

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Low Noise Amplifier Evaluation Board with BGU7003 for 2.4 GHz ISM/WLAN

Schematic PCB