30 W Automotive 410 kHz Preregulator, Non-Isolated, Synchronous Buck Reference Design Based on NCV881930

Protues simulation example (8051)-SPI demonstration file two 595 docking

Protues simulation example (8051)-SPI demonstration file two 595 docking

Schematic PCB

Bluetooth power amplifier board based on TPA3110

Using TPA3110 digital power amplifier chip, the power can reach 15W, and there are two power interfaces. The Bluetooth part uses bk8000L finished module, which has good performance and affordable price. Supports button playback and pause, track switching, volume adjustment, and also supports external audio line input and microphone input. After testing the finished product, the sound quality is good, the Bluetooth connection is relatively stable, the button functions are normal, the external audio line input is normal, and the microphone calls are normal. A complete AD project file is provided, which can be modified as needed, and the BOM needs to be exported by yourself.

Schematic PCB

Protues simulation example (8051) - playing music

Protues simulation example (8051) - playing music

Schematic PCB

syzygy-breakout: Breakout board for standard SYZYGY connectors

SYZYGY is an FPGA extension standard for medium to high speed interfaces. This design breaks out all 32 I/O pins into taps with 0.1" headers. A small prototyping area is also provided.​

Schematic PCB

120-channel logic analyzer based on Raspberry Pi Pico

The Raspberry Pi microcontroller 24-channel 100Msps logic analyzer has been upgraded to support 120 channels.
Daisy chaining of five devices is supported, allowing capture of 120 channels. Includes performance improvements and visibility improvements to the rendering engine, more samples in the screen, automatic selection of capture modes, editing capabilities, and more. The playability is getting higher and higher.

Schematic PCB

Three different buck converter circuit reference designs for converting 12V to 1.2V (load current greater than 6A)

The PMP11438 is a tool used to compare three different power solutions for converting a 12V bus to 1.2V (6-10A). The 1.2V output voltage is suitable for DDR4 memory applications. Each solution offers advantages in full-load efficiency, light-load efficiency, density, height, transient response, or some combination thereof.

Schematic PCB

MAXREFDES1207: Heart rate monitor wristband using the MAX77651B

The MAXREFDES1207 is a reference design for wearable application based on a total Maxim® solution which includes the MAX32660, MAX30112, MAX77651B, and MAX40005. This solution demonstrates how a small size, low cost, low power, high accuracy heart-rate (HR) monitor can be easily implemented. This design can monitor heart rate using two green LEDs.

Laptop camera face recognition program

Open the laptop's built-in camera through matlab and detect faces.

Schematic PCB

Fluke 17b multimeter schematic diagram

Fluke 17b multimeter schematic diagram

Schematic PCB

RD33771-48VEVM reference design

Schematic PCB

Magnetic Tamper Detection Reference Design Using Low Power Hall Effect Sensors

Magnetic tampering can disable any transformer in an energy metering system, which may result in the system not being properly powered or the energy being consumed by the load being recorded incorrectly. This design enables a Class 0.2 three-phase energy metering system that uses Hall sensors to detect magnetic tampering. Magnetic tamper detection is enabled when operating from primary and backup power. Various methods are employed to reduce the current consumption of Hall sensors in order to extend battery life when operating from backup power.

Schematic PCB

Broadband amplifier based on 51 microcontroller

This design uses the variable gain wideband amplifier VCA810 to increase the gain and expand the AGC control range, and uses software compensation to reduce the step interval of the gain adjustment and improve the accuracy. The input part uses a high-speed voltage feedback op amp 0 P A842 as a follower to increase the input impedance, and a protection circuit is added to the input part without affecting performance. Various anti-interference measures are used to reduce noise and suppress high-frequency self-excitation. The power output part is made of discrete components. The passband of the entire system is 4.4 k Hz ~ 8.4 MH z, with a minimum gain of 0 dB and a maximum gain of 70 dB. The gain step is ld B/6dB/arbitrarily set. The error between the preset gain and the actual gain below 60 dB is less than 0.2 dB. The effective value of the undistorted output voltage reaches 10.1 V, and the AGC control range is 52 dB when outputting 4.5 ~ 5.5 V.

Schematic PCB

PYPRCA: python programmable open source calculator based on Raspberry Pi PICO, developed using circuitpython

Pocket calculator style general purpose programmable device (computer) ideal for learning programming and improving building/soldering skills.

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Rodeostat: Potentiometer for electrochemistry, fully open source

It's all open source, and their documentation is very detailed, which is a rare learning material.

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Fully integrated 5A NVDC single-cell battery charger with power path and MaxCharge high-voltage adapter

The bq25892 is a highly integrated switch-mode battery charge management and system power path management device for single-cell Li-ion and Li-polymer batteries used in a variety of smartphones and other portable devices with USB or high-voltage adapters. Its low-impedance power path optimizes switch-mode operating efficiency, reducing battery charge time and extending battery life during the discharge phase. An I2C serial interface for charging and system setup makes this device a truly flexible solution.

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Discovery Kit for STM32G431CB MCU

Discovery Kit, featuring STM32G431CB MCU

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Automotive pre-buck and post-boost reference design using CAN discrete SBC

The TIDA-01428 reference design sequentially implements a 1A, wide input voltage 3.3V buck converter, followed by a compact low input voltage 5V fixed boost converter to power the Controller Area Network (CAN) physical layer interface. This design has been tested for CISPR 25 radiated emissions and conducted emissions using voltage methods, and for immunity to Bulk Current Injection (BCI) per ISO 11452-4 by operating CAN communications at 500KBPS. TIDA-01428 is an EMC-vetted power tree and CAN reference design that can be used in many automotive applications. A system basis chip (SBC) is an integrated circuit (IC) that combines several typical building blocks of a system, including transceivers, linear regulators, and switching regulators. While these integrated devices can provide size and cost savings in many applications, integrated devices do not work well in every situation. For applications where SBC is less suitable, a better approach is to build discrete implementations of the above building blocks to create a discrete SBC.

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KITFS26AEEVM: FS26 Secure SBC Evaluation Board

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Field transmitter reference design supporting BLE connectivity, powered by 4mA to 20mA current loop

TI reference design TIDA-00666 supports Bluetooth Low Energy (BLE) communications and is powered by a two-wire loop capable of 4-20mA. For industrial process control instrumentation, 4mA to 20mA analog current loops are typically used to transmit analog signals. 20mA and 4mA represent the upper and lower limits of the signal range respectively. The TIDA-00666 reference design measures humidity and temperature and broadcasts the measured values ​​via Bluetooth Low Energy technology. The TIDA-00666 design uses loop power supply, and the current value in the loop changes with the humidity value (0% is 4mA, 100% is 20mA).