The CD7642 is a AM radio receiver IC which has automatic gain and up to 72 db gain. It is cased in a TO-92 Case that looks like a transistor. The CD-7642 runs on 1.1 to 1.8 volts so a single 1 1/2 volt battery will work. The CD7642 needs very few external parts to build an AM radio. The CD-7642 needs a tuning Capacitor and Ferrite Rod Coil or also known as a loopstick antenna we sell both items.
The YS414, TA7642, UTC7642, CD7642 and KM484 are the same as the MK484 only different manufactures.
Internal Circuit Diagram for the MK484 same as the CD7642.