In this article, the author, a former student at Luton Sixth Form College, describes how he designed and built a multifrequency transmitter for radiocontrolled models. This was a major project for his GCE A-level Technology examination, June 1989. The project was awarded first prize of £1000 in ‘Engineering Challenge 89’ for Bedfordshire Schools, and third prize in the South East of Britain regional final ‘Young Engineers for Britain 89’ competition.