￥A sourcebook with 84 electronic circuits designed for audio applications. Create excellent audio projects from finished modules. The circuits come with ready-to-use printed circuit board designs, parts layouts, circuit design explanation and installation guides. Create excellent electronic products from finished circuit modules. Why waste long hours of development work. Use the best working circuits in this collection and get satisfaction from your projects while your competitors suffer sleepless nights trying to bring their junks to life. Speed up your work by keeping your troubleshooting time down to almost zero. Forget trial and error. Minimize calculations. More than one transistor equivalent types. Professional PCB layouts. Semiconductor technical specifications. And many many more…!