Adjustable Voltage Meter | SI4732 Radio | STM32 OLED

This text is about the modification of a voltage and current adjustable device with a range of 0-55V and 0-60A. To avoid damaging the original casing of the device, the voltage and current meters are connected externally.

The SI4732 full-band radio receiver has significant hardware differences from the original version, but there have been only minor software changes. Additional new features can be added later.

Product Specifications: The product consists of STM32F103CBT6 (STM32F030C8T6 is also suitable), SI4732, Arduino, and a 0.96-inch OLED display. It has a built-in lithium-ion battery with 1A charging capability through a TYPE-C port. The device provides a 3.5mm stereo audio output and supports 3.5mm stereo audio input as well. The output audio power is 2W+2W.

Frequency Ranges:

· FM: 64-108MHz with RDS functionality

· LW: 153-500KHz

· MW: 520-1710KHz

· SW: 1730-30000KHz (including SSB mode with a bandwidth selection of 0.5-4.0K)

· AM bandwidth selection: 1-6K

· SSB bandwidth selection: 0.5-4.0K

Frequency step:

· FM: 0.1/1MHz

· AM: 1/5/10/50KHz

Dimensions: 1008025mm, designed by Jiālìchuàng with free soldering board.

The panel schematic includes SWD downloading and exposes some unused IO ports for other purposes.

Baseboard schematic:

Changes to the boot-up screen:

Speakers and buttons:

Four-directional control.

Internal images show ample space, allowing for a larger battery.

Different parts of the product are shown, including the STM32 section, SI4732 section, charging and voltage regulation section, and audio section.

STM32 section

SI4732 section

charging and voltage regulation section

audio section

Various frequency ranges are displayed.