In this the toroid transformer is connected with its primary winding on the signal source side and the secondary winding connected to the base of an RF amplifier transistor. Then the turns are wound on the toroid core to build the RF transformerĬonsider the following circuit. Then using the primary number of turns and the turn ratio we calculate the number of the secondary winding. By selecting the toroid core we will know the inductance factor AL and together with the primary inductance knowledge we will know the number of turns for the primary winding. Once we know the primary winding inductance we next select toroid core based on frequency of operation and suitable size for winding the core. Then we estimate the inductive reactance at the primary side(or secondary side) for given frequency and calculate the inductance for the primary winding. First we calculate the turn ratio using the knowledge of source and load impedance to be matched. The process of making RF transformer using toroid core is explained briefly. For calculating the number of turns we need to know the source and load impedances and frequency range over which the circuit is operated. To build the toroid RF transformer we need the number of turns for the primary and secondary and select a toroid core.
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