USB mini DAC

Introduction: PCM2706+ES9023P mini USB DAC (official version, verified)

Schematic PCB

QCC303X Bluetooth Receiver

Introduction: A Bluetooth music receiver based on the BTM334 module, which can also be used as a USB sound card

Schematic PCB

ES9023P Stereo Audio DAC Verification Board

Introduction: Stereo audio DAC solution verification board based on ESS ES9023P

Schematic PCB

CM6631A USB interface card

Introduction: CM6631A USB2.0 sound card interface card, size and main pin compatible with Amanero daughter card

Schematic PCB

CH9340 USB to serial port module

Introduction: USB to serial port module based on CH9340K

Schematic PCB

TPA6120 Portable Headphone Amplifier V3.0

Introduction: A portable headphone amplifier powered by USB

Schematic PCB

Homemade linux small computer

Introduction: Allwinner V3S main control, board shape and screw holes compatible with Raspberry Pi

Schematic PCB

Homemade astronaut-themed thermometer and hygrometer

Introduction: This project uses ESP32 master control and SHT31 temperature and humidity sensor.

Schematic PCB

Homemade GameBoy game console

Introduction: This project is based on esplay, and some components and circuits have been modified based on the original author's work.

Schematic PCB

Multi-signal generator composed of LM324 and 74LS00

Introduction: This is the self-assessment training of the 19th Guangzhou Institute of Navigation Electronic Information for the 2019 electronic competition retest questions. Review the use of operational amplifiers, RC circuits, NAND gates, etc. from this project, which is very comprehensive.

Schematic PCB

Open source justMLS impedance analyzer

Introduction: Use justMLS, REW and other software to measure the impedance phase curve on the computer through the sound card, which supports up to 96KHz (sound card requiring 192KHz stereo input)
http://www.roomeqwizard.com/

Schematic PCB

Discrete amplifier mos output version 1969

Introduction: Full chip aluminum substrate mos output 1969, refer to the circuit design of this post http://bbs.hifidiy.net/thread-1157107-1-1.html, the measured performance is good, and the cost is also very low

Schematic PCB

Flash circuit board-open source

Introduction: Flash circuit practice

Schematic PCB

Rev.GP Panda Panda PCB cover

Introduction: GP Panda Cover

Schematic PCB

SI4825 DSP mechanically tuned digital radio

Introduction: High-sensitivity AM SW FM radio with simple circuit and easy installation. Very suitable for DIY.

Schematic PCB

espWatch4.1

Introduction: Small watch made using ESP8266-12f

Schematic PCB

15V power amplifier

Introduction: 15V Audio Walkman Speaker

Schematic PCB

[RA] Ink screen design based on Renesas MCU

Introduction: [RA] Ink screen design based on Renesas MCU

Schematic PCB

mini mp3

Introduction: A rookie mp3 project

Schematic PCB

CH340K

Introduction: Possibly the smallest ch340k programmer

Schematic PCB