I’m sure you know how to find devices capable to convert your cassette tapes to digital music, but let me show you the best solution I’m aware of at the moment.
This is the Tape Express, a very compact device that looks like a walkman, but it’s actually a cassette tape-to-MP3 converter. I like it because it’s small, unlike the other devices available in stores.
Tape Express plugs into the USB port of your computer and allows you to convert audio from cassettes to MP3 while you are listening to it, because it works as a converter and a portable cassette tape player. You still need to use the included EZ Tape Converter software that makes things easier and you can use the converted files however you like.
The device powers either via USB while connected to the computer or by an AA battery.
Additional features include the possibility ti play the cassettes inside the device through external Hi-Fi or speakers via the 3.5-mm headphone jack, compatibility to Mac OS X and Windows operating systems and a size of 11.5 x 8.5 x 3 cm.
Tape Express seems to be a great solution for converting your cassette tapes collection to MP3 files and you can get one from Iwantoneofthose.com for a price of £49.99.