This book discusses the features of circuit solutions used in the creation of miniature transistor radio transmitting devices. The relevant chapters provide information on the principles of operation and features of the functioning of individual units and cascades, circuit diagrams, as well as other information necessary for the independent construction of simple radio transmitters and radio microphones. A separate chapter is devoted to the consideration of practical designs of transistor microtransmitters for short-range communication systems. The book is intended for beginning radio amateurs interested in the features of circuit design solutions for units and cascades of miniature transistor radio transmitting devices.