A book (English language) about audio circuits: pre amplifiers, active and passive audio filters, a mixing circuit, power amplifiers, Chip amplifiers, loudspeaker boxes, cross over circuits. Much attention is payed to good practice (and pitfalls) in home brewing audio amplifiers. Like proper ground wiring, shielding, earth faults, ground loops, hum, properties of a power supply, etc. Ment for people who want to make their own audio system from scratch and don't want to have problems in engineering. Approx. 44 schematics and 45 illustrations.Copyrighted content.