5-7 pins are short-circuited and 6 pins are adjusted, which is consistent with the reference design, but please refer to the specifications for the periphery. Add resistance between pins 5 and 7, do not short circuit directly, and add capacitance at the output of pin 7.
CT (Pin 5): the access end of the oscillator timing capacitor. RT (pin 6): the access end of the oscillator timing resistor. Discharge (pin 7): the discharge end of the oscillator, and a discharge resistor is externally connected between this end and pin 5 to form a discharge loop.
the theory of transformer
Transformer is a device that uses electromagnetic induction principle to change AC voltage. The main components are primary coil, secondary coil and iron core (magnetic core). In electrical equipment and wireless circuits, it is often used for boosting, impedance matching, safety isolation and so on. In the generator, whether the coil moves through the magnetic field or the magnetic field moves through the fixed coil, the potential can be induced in the coil.
In both cases, the value of magnetic flux is unchanged, but the amount of magnetic flux in the chain intersecting with the coil has changed, which is the principle of mutual inductance. Transformer is a device that uses electromagnetic mutual inductance to transform voltage, current and impedance.