Although the ubiquitous LM386 IC was designed to be used as an audio amplifier, it has a number of undocumented ... which could be used as an AM receiver by simply connecting a tuned circuit to its ...

N.O. Sokal and A.D. Sokal, “Class E – A New Class of High-Efficiency Tuned Single-Ended Switching Power Amplifiers”, IEEE Journal of Solid-State Circuits, Vol SC-10, No 3, pp. 168-176, June 1975. 2.