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Brief Analysis of Transformer and Inductor Selection and Replacement

1 inductor selection and replacement
When selecting an inductor, first consider its performance parameters (such as inductance, rated current, quality factor, etc.) and the dimensions to meet the requirements.
As for small fixed inductors, color code inductors, and color ring inductors, as long as the inductance and rated current are the same, the external dimensions are similar, and they can be directly replaced.
The oscillating coils in semiconductor radios, although different in model, can be replaced by each other as long as the inductance, quality factor, and frequency range are the same. For example, the oscillating coil LTF-1-1 can be directly substituted with LTF-3 and LTF-4.
For the row oscillating coil in the TV set, the product of the same model and the same specification should be selected as much as possible, otherwise it will affect the installation and the working state of the circuit.
The deflection yoke is generally used in conjunction with a picture tube and a line and field scanning circuit. However, as long as the specifications and performance parameters are similar, even if the models are different, they can be replaced.
2 transformer selection and replacement
1. Power supply | voltage regulator | regulator transformer selection and replacement
When the power transformer is selected, it should be matched with the load circuit. The power transformer should have a power margin (the output power should be slightly larger than the maximum power of the load circuit), and the output voltage should be the same as the AC input voltage of the power supply part of the load circuit.
For general power circuits, an "E" type core power transformer can be used. In the case of a power supply circuit for a high-fidelity audio power amplifier, a "C" transformer or a toroidal transformer should be used.
Power transformers with the same core material, output power and output voltage can usually be directly interchanged.
2. Selection and replacement of row output transformer
After the TV line output transformer is damaged, the line output transformer of the same model as the original model should be selected as much as possible. Because of the different types and different specifications of the line output transformer, the structure, pin and secondary voltage values will be different.
When selecting the line output transformer, it should be visually checked whether the core is loose or broken, and whether the appearance of the transformer is not tight. The new line output transformer should also be compared with the original line output transformer to see if the pin and the internal winding are exactly the same.
If there is no replacement of the output transformer of the same type, it is also possible to replace the output voltage of the core and the output voltage phase of each winding, but the output transformer of the pin number is different (for example, the winding winding end, changing the pin order, etc.).
3. Selection and replacement of intermediate frequency transformer
The intermediate frequency transformer has a fixed resonant frequency. The intermediate frequency transformer of the AM radio and the intermediate frequency transformer of the FM radio and the intermediate frequency transformer of the TV are also not interchangeable. The intermediate mid-frequency transformer of the TV set and the image intermediate frequency transformer cannot be used interchangeably. .
When using an intermediate frequency transformer, it is best to use an intermediate frequency transformer of the same model and the same specification, otherwise it will be difficult to work normally. When selecting, the windings should also be tested to see if there is a wire break or short circuit (the coil and the shield are touching each other).
After a certain intermediate frequency transformer in the radio is damaged, if there is no replacement of the same type of intermediate frequency transformer, only the complete set of intermediate frequency transformers of other types of intermediate frequency transformers (generally 3) can be replaced. When replacing the installation, the order of a certain level of intermediate frequency transformers cannot be misplaced and cannot be exchanged at will.

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