Published by Elektor Electronics in 1991, 304 Circuits is a comprehensive collection of tested electronics projects covering audio, video, RF, and hobbyist applications. The book, which is part of the "300 Series," is accessible via digital archives or within the Elektor Magazine USB archive stick. For more details, visit Internet Archive . 304 circuits : Free Download, Borrow, and Streaming
: Signal generators, frequency counters, and various meters.
: Pre-amplifiers, power amplifiers, and signal processors.