All digital radios use DSP chips, but Tecsun's analog radio's also use an Integrated Circuit. Specifically, that I know, are the R-911 and R-9012. These use a CXA-1622B chip IIRC designed by SONY. These are analog, and the receiving bands must be manually adjusted at factory. This SONY chip is VERY efficient with 2AA batteries... over 400 hours continuous can be expected at a decent volume.

Yes, the question is vague, as these analog Tecsun's have been around 15 years or more (my old R-911 was dated 2006, and a Kaito WRX911 was dated 2004). And they still make them.

Regards
Paul S. in CT FN31nl