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