From Resistor to AM & FM Radios: Analog Electronics with applications to Audio and Radio circuit design (7e)

This book, now in its seventh edition, provides an introduction to transistor and diode based circuit design of Audio Amplifiers , AM & FM radio receivers , and AM radio transmitters . The transistor internals of the famous 555 timer chip and the LM386 audio amplifier chip are covered in detail. Moreover, a design of a MOSFET based AGC ( Automatic Gain Control ) stage that can fit with the LM386 and practically any other audio amplifier is presented in detail.

* AM radio receiver designs - on the basis of a diode detector (a specialized diode is not required, and any ordinary diode like the common 1N4148 can be used). Needless to say the diode detector doesn't stand on its own, but is attached to preceding and subsequent buffering and amplifying stages, resulting in a complete radio receiver - from antenna to speaker.

* Two AM modulator designs (to generate an AM signal) - one diode based and the other based on a differential amplifier transistor design.

* FM radio receiver designs - An FM radio receiver which amplifies and down-converts the antenna signal with the help of purchased products, but then proceeds with an entirely custom transistor and diode based discrete circuit design to demodulate the frequency down-converted signal and amplify the extracted audio.

* a MOSFET based Automatic Gain Control ( AGC ) circuit to automatically attenuate the amplitude of the audio signal prior to its reaching the audio amplifier for further amplification, if the audio signal too large. It can work with the LM386 ot other audio amplifiers.