6Zkh3

Desktop electronic clock

Overview

1. The main
control circuit uses a Renesas R7 series chip, with each pin exposed.

2. A passive buzzer driver circuit is used as the alarm clock module .

3. The display module
uses software to drive a cathode ray tube to display the time, date, temperature, and humidity.

4. The power module
can be powered via USB or a coin cell battery.

A TP4056 linear charging chip is used for charging management, and it is packaged in an ESOP8 package to supply power to both the USB port and the adapter.

Second Board Desktop Electronic Clock.zip

BOM.xlsx

RA2E1_Clock.hex

Tool shaolu Project.zip

PDF_Desktop Electronic Clock.zip

Altium Desktop Electronic Clock.zip

PADS_Desktop Electronic Clock.zip

96944

ESP32 debugger

The functionality has been verified by board testing. The USB expansion chip CH334R is used to expand 4 USB signals, and one USB signal and serial port are directly connected to ESP32 S3/C3. An STM32G030F6P6 is added to collect sensor data.

PDF_ESP32 debugger.zip

Altium_ESP32 debugger.zip

PADS_ESP32 debugger.zip

BOM_ESP32 debugger.xlsx

96945

TDA2050 Mono Amplifier Board

The completely independent amplifier circuitry provides better separation and facilitates installation.

The two channels use completely identical and independent power supply and amplification circuits. In addition, LCSC's color printing gold process not only enhances the appearance but also reduces wire resistance and power supply internal resistance, thereby achieving better stereo separation. The high and low frequencies are improved, and the effect is very good.

PDF_TDA2050 Mono Amplifier Board.zip

Altium_TDA2050 mono amplifier board.zip

PADS_TDA2050 Mono Amplifier Board.zip

BOM_TDA2050 Mono Amplifier Board.xlsx

96947

docking station + STM32 keypad

I often lamented the lack of sufficient USB ports on my computer and the absence of a simple Ctrl+C/V function, hence this 2-in-1 solution. Unfortunately, I forgot to add a 1.5k pull-up resistor to the USB port. This has already been fixed in the project, allowing it to run at full USB 2.0 speeds.

Essentially, it's a USB docking station plus an STM32 keyboard. There aren't any ready-made products I need on the market, and since I've been playing with STM32 recently, I decided to try it myself. Any chip that supports HID will do; I haven't tried other chips yet.
Some points:
1. Due to the high integration, soldering is difficult, which is not user-friendly for beginners like me.
2. The key actuation force is a bit high, making it not smooth to press. The keys in my project are 260GF small keys.
3. I initially planned to make a 4x4 matrix, but found that I didn't need that many, so I reduced the number. There's still room for development on the back.
4. Other types of Type-C connectors can be chosen; differential pair wiring is sufficient.
5. Since this is just for fun, no protection circuit was designed, so it's not anti-static.

usb_keybord.rar

PDF_Dockyard + STM32 Keyboard.zip

Altium_Dock + STM32 Keyboard.zip

PADS_Dock + STM32 Keyboard.zip

96948

electronic

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2026-03-26 18:47:13

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