The adjustable inductor

                                              The adjustable inductor

The mid-cycle of the radio is an intermediate frequency transformer (commonly known as mid-cycle), which is a unique transformer with a fixed resonant circuit in superheterodyne transistor radios, but the resonant circuit can be fine-tuned within a certain range to make it stable after being connected to the circuit The resonance frequency (465kHz). The fine adjustment is done by means of the change of the relative position of the magnetic core.

Introduction to Radio Midweek

Most of the intermediate frequency transformers in the radio are single-tuned, with simpler structure and less space. Due to the low input and output impedance of the transistor, in order to make the intermediate frequency transformer match the input and output impedance of the transistor, the primary has a tap and a secondary coupling coil with few turns. The advantage of dual-tuning is better selectivity and wider passband, which is mostly used in high-performance radios.

A two-stage intermediate frequency amplifier is usually used in a transistor radio, so three intermediate circuits are needed to couple and transmit the front and rear signals. The middle week in the actual circuit is often represented by symbols such as BZ1, BZ2, and BZ3. In use, they can't change their positions in the circuit at will.

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