I sold and repaired so many of such AdaptersI had a China made fm radio long years ago. It was small size, it could run by two pencil battery or a power adapter. Power adapter was very unique because it could set different voltage for different purposes. And it had very good reception.. But i was a class 5-6 student and stupid to understand it's value. So i opened it because it was making a noise, disassemble its every parts one by one and couldn't fix it again.. Then i broked it.. I still miss that radio. Now Sony have a similar type of radio but don't want to spend Rs1800 just for 10 radio stations. In future may be i can get a music system with inbuilt radio..
Haveing DC volt range from 3v to 12v 500ma
And for high consumption 1amp adapter.
Senior people may recall the local electrical interference due to Fluorescent Tube Light on MW specially and pain in tuning of Shri Lanka Broadcasting Corp. on 25 meter band SW (hope frequency is correct though we never able to listen on 41 or 49 ? meter band) due to strong interference from China/Russia radio stations specially on 8pm the Binaka Geet Mala time.
Then came FM in Delhi AiR FM where time slots were sold to private players and Times FM was so popular.
Now we have DAB+ radio transmissions (MW/SW) in India but without receivers to catch them.
Naturally except FM both SW MW are dying but with emergence of Internet Radio we can listen all the MW stations on our Smart TV/Computer/Mobile.
The beauty of radio is that it does not stops you from work but enhances your mood.
TV requires full attention so unless you are free you can not enjoy it.