SI4735 - ESP32 - ALL BAND FM-RDS-LW-MW-SW - STEREO RADIO -Designed by JasonKits QRP in Malta
PCB Version 1.0D : Added filter on rotary encoder & removed LM1117 5.0V pads as they are not used. DC Input diode added smd pads. Fixed Audio Termination resistors 10k. PCB Version 1.0C : New Stock o…Read More…
PCB Version 1.0D : Added filter on rotary encoder & removed LM1117 5.0V pads as they are not used. DC Input diode added smd pads. Fixed Audio Termination resistors 10k.
PCB Version 1.0C : New Stock of Boards available now! - Added I2c Bus and Extra I/O pins on connector. - see picture! If stock is depleted please check Jasonkits store ! Changes Made :
DC Step down Regulator now has pads on P.C.B
Audio Amplifier Power is selectable between +5v and Input supply 9v via 3 pin jumper
Added inductor on F.M mode for local stations.
Software Version : 5.2B - Added Squelch Mod.
The DSP Radio is based around the Silicon Labs chip SI4735. It is a full band radio in one chip and supports AM/MW/LW, FM Band 60 - 84MHz, and FM Band 84 - 108MHz including HF by using a patch to do SSB with USB/LSB, mostly used by Ham radio operators.
Software Credits goes to IU4ALH Squelch Mod , Binns Mod & Ricardo For the Wonderful SI4735 Library.
Switchable Pre-amp on aerial input selectable with jumpers - can be replaced with switches
Battery Charger with over voltage protection.
speaker out 3.5mm jack
can operate from li-po 4.2v or D.C. in 9v
This 17db gain preamp board can be switched or bypassed.
I was fascinated with the idea when I saw the datasheet of this chip. Furthermore after i built the version with the OLED display i kept seeing improvements with the TFT LCD screens. So after i saw that a memory bank mod and the spectrum band scan features added I decided to build one. After gathering the proper schematics i designed a p.c.b my own board and added features that are nice to have. Thanks to all the people who contributed to the Arduino library I was able to build my own version.
The Main Features are:
The DSP radio featured in this listing covers all Shortwave HF amateur bands from 1.9 MHz to 28 MHz. Also covers the FM band from 64 - 108Mhz, Reads and decodes the FM RDS signal, and displays it on the LCD screen and also the MW and LW bands.
Uses the popular 2.8" TFT display with Touch Screen to display and control the radio.
Worldwide FM band support (64–108 MHz)
Worldwide AM band support (520–1710 kHz)
SW band support (Si4734/35 and Si4730-D60) (2.3–30 MHz)
LW band support (Si4734/35 and Si4730-D60) (150–510 kHz)
Excellent real-world performance
Automatic frequency control (AFC)
Automatic gain control (AGC)
Digital FM stereo decoder R.D.S
Advanced Audio Processing - Digital Signal Processing
Seven selectable AM channel filters
AM/FM/SW/LW digital tuning
Stereo and Signal Indication
Fully customizable firmware thanks to the Arduino IDE. A big Appreciation goes to Bernard Binns for re writing the front end & Ricardo for writing the library.
Uses an ESP32 WROVER S - upload a new firmware with the usb port located on the rear of the board.
Can be powered with a battery pack - with rear charging socket
Touch Screen buttons - to control the radio functions Volume +/-, Band +/-, Mode SSB/LSB/USB, Step, Bandwidth , Bfo/Vfo, Setup, Mode, Seek, Scan, Light Brightness, Chip Info, Radio Info, Mute, Retro Mode.
Bandwidth change control range 500 Hz to 4 kHz - ideal for noise rejection
Step tuning in four ranges 1,5,10,25
Rear BNC Connector for External Antenna
Rear connector 3.5MM for Stereo Headphones
Auto Mute Audio clip when powered on (Remove Big Thump from the speaker)
Battery Status Voltage on Main Screen - can be switched off in setup
Stereo TDA2822 Audio Amp on board
Rear Latching Power Switch
Front layout PCB with TFT LCD Display and Touch screen and Rotary Encoder measuring 139 x 87 mm
Rear Power - Power Switch - Speaker - Headphones - Aerial jack on Horizontal PCB.
Memory bank - to store favourite channels
Spectrum Band Scan
Frequency Scan - Seek Up - Seek Down buttons on screen
Chip info and status info screens
Automatic screen saver - can be configured in setup
Screen Brightness control -
What is Included?
A Ready Assembled board Tested and aligned Radio with Latest software loaded , excludes battery and speaker
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Richard | April 2, 2023
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