DAB+ project.

Why ?

Earlier, my students created a small FM radio. However because of the lack of  IC’s and the associated PCB’s and one was talking about replacing FM by DAB+, the search for a new project was started.

Finally I found a manufacturer in Taiwan who was willing to sell to me the DAB+ tuners.

Because, for the use of only the studens, the project would last to many years with the purchased amount, this product is also offered to the electronics hobbyists. The interest is larger than expected.

In this project there are 3 separate available parts:

The tuner.

DAB+/FM tuner module
DAB+/FM tuner module

The tuner is the T3B from Keystone Semiconductor. It is an ETSI EN 300 401 compatible tuner. It can receive DAB+/DAB and FM.

This is an slave module; you need to send commando’s to the tuner. This can be done using an Arduino or other µcontroller (or pc). The communication is via UART or I2C.

This module does not contain the Dataserive or SLS-function (slideshow). In the near future,  experiments with a newer tuner will test  the possibilities of this function.

There are I2S and SPDIF possibilities, to be activated by a command. On the interface pcb there are no connection provide for these functions.  Audio is provided via LINE-OUT.

Tuner uses 3,3V and 1,2V.

the interface pcb.

DAB+ interface back
DAB+ interface back

There is a pcb developed on which the components are fitted for providing the correct voltages to the tuner, and this at the right moment (one voltage must be provided before the other). There is also a shiftleveler for converting the 5V from the Arduino (or other) to the 3 .3V of the T3B tuner.

The interface pcb can be plugged on the Arduino UNO. So, another pcb can be put on witch one find the lcd or buttons to control the software.

The parts.

De nodige onderdelen om de interface te maken.
De nodige onderdelen om de interface te maken.

For the pcb, components are selected, these are currently still available separately. Sometimes there are pcb’s available which already have the SMD components soldered on it. When you want to make this project but you are not in the possibility to solder, please let us know.

The components are all of excellent quality. Unfortunately, the quality of e.g. headers and connectors from China was not good enough. So the headers and connectors are not from China and are the more expensive parts in the package.

Next parts are NOT provided:

lcd : one can choose there own lcd and change the code depending on the size of the lcd.

buttons: in the base-version of the project, there are 5 buttons used to control the tuner. These buttons are not provided.

Antenna:  the antenna can be a simple wire.  People who live close to a transmitter should not put to many demands on their antenna. When the transmitter is further away,  the choice of antenna is becoming increasingly important.

RF-connector: One can solder the antenna wire directly to the tuner. If you want to use a better antenna, there are opportunities to solder a F-plug or SMA connector directly to the tuner.

Documentation.

When you purchase the project, or tuner, there is extensive documentation. You will then receive the data sheet, the commands, how to build the interface, etc.
These documents are not put online since they are documents with legally protected content. These original documents are edited and for these  permission is obtained to share them with other electronics hobbyists under strict condition that those documents are not to be found online.