The application of transistors to a.m. broadcast receivers

摘要

The performance specification of a transistor receiver, which is to be competitive with existing four-valve portable receivers, is first laid down. It is shown that with a single-ended class A output stage a minimum of six transistors is needed to meet this specification, or seven transistors when using a class B output stage. The latter design is to be preferred for reasons of running economy. Problems encountered in the design of the component circuits of the receiver are considered in some detail, and the design of an experimental receiver is described. Running costs of transistor and valve receivers are compared.