Kolegové z Ruska zase vytvořili podivuhodnost Jde o USB klíčenku která je přeladitelným FM vysílačem od 76 do 108 MHz. Napájení bere z USB, výkon tedy není nijak velký, ale na domácí vysílání to stačí bezproblémově.


Provedení





Parametry

Transmit Frequency: 76 ... 108 Mhz.
Transmit Power: -60 ... 20 dBm[1].
Audio Compression: Yes
Audio Limitation: Yes
Audio Signal Measurements: Yes
Pre-Emphasis: 0/50/75 uS.
RDS: Yes
RDS RadioText: Yes
RDS Time: Yes
Drivers Installation Needed: No[2]
Software Needed: No[3]
LEDs That shows state: Yes
External power needed: No

[1] Maximum ERP allowed by E.T.S.I. In Europe

[2] If You don't have pre-programmed EEPROM chip, then You need to use DFU-Util to load firmware into EEPROM. This operation have to be done only once and only on case when You have clear EEPROM.

[3] You may save transmitter configuration parameters (such as frequency, power, RDS info and audio compressor/limiter values) into EEPROM. If You do this, You dont need FmStick software to run Your transmitter. It will auto-load this configuration when FmStick hardware connected to computer.




Použité díly

Processor: must be TAS1020A or TAS1020B. Just TAS1020 (without last leter) - will not works!

Transmitter: The tested samples - are: SI4711-A20-GM/SI4711-A20-GMR. Also (maybe) will works this chips: SI4711-B30-GM/SI4711-B30-GMR and SI4713-A20-GM/SI4713-A20-GMR or SI4713-B30-GM/SI4713-B30-GMR. Other chips (SI4711-A-GM/SI4711-A-GMR and all versions of SI4710/SI4712) - does not support digital sound, that's why we can't use them (but we able to add some DAC's but it would be workaround, not a solution).

EEPROM: Simple 8KBytes i2c-memory chip: 24LC64.




Odkaz

Projekt s mnoha dalšími fotografiemi, zdrojovým kódem a dalšími podklady můžete najít zde.