This stereo encoder produces an excellent crystal clear stereo sound and very good channel separation that can match with many more expensive stereo encoders that are available on the market.
http://electronics-diy.com/stereo_encoder.php
This project supports both RDS (Europe) and RBDS (USA) Tuner FM band 88..108 MhZ (Europe and USA.) You can choose between a 4x20 character LCD or a smaller graphical LCD to display data. A simple RS232 interface can also be used.
http://www.techdesign.be/projects/021/021.htm
http://www.nutchip.com/progetti/encoder_led_en.htm
http://www.paia.com/msdecwrk.htm
The encoder works alone - PC is required only for loading data to the encoder.
http://members.lycos.nl/rdsencoder/rds1.html
This circuit connected to the PIRA32 expansion IIC bus connector provides backup for internal real time clock during power off. This can be sometimes useful if back-up power supply is not used on the transmitter site.
http://www.pira.cz/rds/rdsschem.htm