In this paper a technique for analysis and design of an Automatic Frequency Control (AFC) system is presented. Transient Envelope is used as simulation tool, due to the AFC features in terms of response time and spurious components at the output. From a previous stage of analysis and design, the final implementation of the AFC, using commercial analogical components, will be presented. The obtained results in the laboratory will show the validity and limitations of both simulations and the selected circuit architecture, allowing circuit modifications to improve its performance.