S P Bali has over 45 years of association with the field of electronics. As a professional trainer, he has been directing job- oriented courses on Audio and Video Systems and Consumer Electronics. With over 20 years of teaching experience, he has been teaching new entrants in the field of electronics and diploma-level courses in the Military College of Electronics and Mechanical Engineering (MCEME), Secunderabad. He has been contributing articles to magazines and has authored several other books as well.