FM Radio module - kit build (#68)

This radio module is based around a dedicated chip, the Hex 3653. Definitely great value, a smidge over £1 at Aliexpress:

https://www.aliexpress.com/item/Wireless-Stereo-FM-Radio-Receiver-Module-PCB-DIY-Electronic-Kits-76MHz-108MHz/32757026560.html

There doesn't seem to be a datasheet for the chip, but Gough's Tech Zone has worked out the circuit diagram here:

http://goughlui.com/2016/09/28/project-reverse-eng-hex3653-av2b-stereo-fm-receiver-kit/

It's well worth a read through of the write-up here. The jumper, it turns out, allows you to select to use the headphone lead as an antenna, or (as here) use an external antenna.

This site has a good schematic, but the text is in Chinese:
https://wenku.baidu.com/view/61d8f73d6f1aff00bfd51eb5.html

Edit: this kit seems to be a clone of a kit by ABRA. Google for 'ABRA AK-270' and you should be able to find a detailed assembly manual with schematic.

Видео FM Radio module - kit build (#68) канала Martyn Davies