Light Hammer 200 Battery Protection Board

eve25p_final.srec

Battery spot welding mold.stl

PDF_Light Hammer 200 Battery Protection Board.zip

Altium_Light Hammer 200 Battery Protection Board.zip

PADS_Light Hammer 200 Battery Protection Board.zip

BOM_Light Hammer 200 Battery Protection Board.xlsx

93896

EastMartrix Pixel Clock Master

Modified based on the open-source code of Da Congming on Bilibili.

The surface-mount resistor was changed to a 0603 package, and the photoresistor was directly soldered onto the PCB.
This controls the EastMartrix pixel screen display.

PDF_EastMartrix Pixel Clock Master Controller.zip

Altium_EastMartrix Pixel Clock Master Controller.zip

PADS_EastMartrix Pixel Clock Master Controller.zip

BOM_EastMartrix Pixel Clock Master Controller.xlsx

93897

Industrial control board PLC_V1.1

A PLC industrial control board, compatible with Mitsubishi FX2N, which can use ladder diagrams written by Mitsubishi.

The main controller is an STM32F103VET6, which has been verified to work properly after flashing custom firmware. It needs to be programmed using a flashing socket. The wiring is only connected and hasn't been optimized yet; I'll optimize it later when I have time.

PDF_Industrial Control Board PLC_V1.1.zip

Altium_Industrial Control Board PLC_V1.1.zip

PADS_Industrial Control Board PLC_V1.1.zip

BOM_Industrial Control Board PLC_V1.1.xlsx

93898

15-24V input, ±35V output power supply based on TPS40210

The SEPIC+CUK circuit based on TPS40210 can realize the step-up and step-down of positive and negative voltages and can be used as the positive and negative power supply for power amplifiers.

Circuit principles, design considerations, and software tools are explained in reference to Professor Tang's related videos: Op-amp Dual Power Supply, Open Source XL6007 SEPIC+CUK Schematic and PCB.
 
Test results and modification suggestions are provided directly here.
The TPS40210 is an asynchronous boost controller; appropriate switching transistors can be selected to increase output power.
The switching frequency is set to 550kHz, achieving ±35V output.
 
The physical diagram is shown below.
 
The testing method is as follows:
15V and 20V voltages were taken from the power adapter using a CH224K for testing.
The load is a BTL power amplifier circuit built with a TDA7294V.
The filter capacitor on the power amplifier board was not soldered because soldering it would cause abnormal power output. The reason is estimated to be that the output capacitor is too large, resulting in excessive current during power-on and triggering the chip's protection function (the load current is designed for 2A).
 
 
The actual output power is unclear. There was no resistor as a load, and the output volume was not turned up too high to avoid disturbing neighbors. Ripple was measured at the following four locations.
 
Significant differences were encountered during positive voltage measurements.
The result measured on the power board was unusual, reaching 72mV.
 
On the amplifier board, the ripple measured from the large capacitor pad was only around 18mV.
 
The negative voltage was more normal:
approximately 13mV on the power board and
 
approximately 20mV on the amplifier board.
 
Furthermore, the inductor temperature was high during operation; a larger package could be considered.
 
When modifying the wiring layout, care should be taken to minimize the area of ​​the two high-frequency current loops.