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Basics by From Ian C. Purdie, VK2TIP

A short wave regenerative receiver project by Charles Kitchin, N1TEV

Information and tutorials about all aspects of radio and electronics including propagation, ham radio, electronics, radio history, etc

Negative feedback is often referred to as shunt feedback in conjunction with emitter degeneration.

Article explaining electronic network of low pass filters

Understand how high pass filters are done

Essentially, a choke balun is designed to 'divorce' your antenna from the feed line. if your feed line is coaxial cable then you don't want it to be part of your antenna. you want to be able to deliver all your power to the radiator itself, i.e. 'the antenna'. a choke balun does this admirably

Descriptions, summaries,and tutorials about electronic circuits and electronic circuit design including amplifiers, attenuators, logic, transistor, operational amplifiers and much more

HamRadioSchool.com combines traditional textbook learning with modern online tools. Their approach focuses on building conceptual understanding rather than just memorizing answers. The site offers structured courses with clear learning paths, video tutorials, and interactive quizzes. Their materials are particularly strong on electronics theory fundamentals. The site also maintains an active blog with tips for new operators and explanations of confusing exam topics.