Muitiband Receiver

Multi-band radio based on NXP TEF6686

Demo video:

Introduction to multi-band radio based on TEF6686-Bilibili

QQ communication group: 616786582

If you have any questions, you can join the group and ask~

introduction

• • RF reception: NXP TEF6686 DSP single-chip reception, supports antenna feed, with S meter indication
  • Power supply: TYPE-C fast charging input, built-in charging power management, 8000mAH lithium battery
  • Audio: Maxim DirectPath 50mW headphone amplifier, dual Class AB 3W amplifiers, audio VU indicator

More

• • Backlight brightness is adjustable and can be turned off, backlight time is adjustable, and contrast is adjustable
  • The threshold and speed can be set for automatic station search, and stations can be saved manually. Number of stations saved: 100*FM, 100*SW, 50*MW, 20*LW
  • Power-off memory settings and saved stations

The FM band effect is excellent, and the AM reception effect is also good. You can increase the reception effect through an external LNA.

The accessories for the 3D printed shell have been uploaded. The screws are self-tapping with M2*(6,10) and M3*8.

4 buttons need to be printed in the 3D print

2022.4.14

The production guide has been uploaded as an attachment~

2022.4.29

Everyone's enthusiasm is a bit high, so I plan to update a cost-reduced version in the future. If you want to make it, you can wait.

The main control is planned to be replaced by the domestic GD32F103RCT6, but since I am not very familiar with GD32, plus I am a bit busy with studies and don’t have much living expenses, the development time should be relatively long.

Of course, this version can also be used now (the STM32 version has been dismantled and cannot be maintained anymore. Please make a GD32 version) .

2022.5.25

The GD32 version was verified successfully and the UI was optimized. However, during the process of making the GD32 version, I dismantled the STM32 version machine, so the STM32 version can no longer be maintained. In the future, only the GD32 version will be maintained and updated.

The production process is similar to the STM32 version, but the firmware download is changed to USB-to-serial port download. No downloader is needed, only a USB data cable and the official download software are needed.

Let’s put the picture first:

Keil project files, BOM, 3D printing files, download instructions have included project attachments, PCB is still open by clicking the editor in the upper right corner, Board3 and Board4 are the GD32 version , please don’t enter the wrong board

2022.5.30

Update program to v2.1

Fixed the bug that the AM station cannot be saved after power off, fixed the bug of quickly searching for stations in the shortwave band, and added a very cute startup animation (bushi

2022.7.6

Update program to v2.2

The voltage display has been changed from rounding down to rounding, eliminating some possible timing conflicts, adding screen brightness DC offset adjustment, and optimizing the S meter speed.

2022.7.21

Update program to v2.3

Increased the system response speed; should have eliminated most of the timing conflicts; adjusted the IIC waveform to increase the communication rate; slightly optimized the accuracy of FM station search; fixed the bug where the data stopped updating after the homepage station search reaches the end; added The animations for searching for channels on the homepage and searching for channels in the full frequency band no longer look like they crash when searching for a channel.

2022.7.27

Updated the program to v2.4, big update!

Modify the DAC dimming formula, modify the startup animation, reset the menu
--LCD related setting items (bias, scan rate, reverse display)
--Audio gain adjustment
--FM enhancement is divided into channel equalizer and multi-path interference
suppression-- Supports MPX output
- adjustable search channel threshold -
adjustable upper and lower limits of FM search
- medium wave step 9K/10K
- added attribute viewing (DSP logo, system version, MCU unique ID, MCU information, temperature (bias) Shift reference), internal reference)
--Add IRC40K calibration function

2022.8.6

Update program to v2.5

Added support for V205 (F8?05), added support for FMSI (TEF6687/6689 only), greatly improved the accuracy of station search, and fixed the bug that the backlight would not turn off after booting.

2022.8.26

Update program to v2.6

Automatically identify the version number of the radio chip, automatically adjust to the last station that has been played continuously for more than 10 minutes when booting, and adapt to the new screen driver board (adjust nBLBaseline to 0)