1.autotransformer with is not necessarily to use the 0 coil, is to obtain a variety of voltages or signals through the tap.
In the high-voltage (more than 36V) application is directly connected to the power grid, all the internal lines are high-voltage, but the external shielding is also very safe.
For the use of radio or communications for low-voltage high-frequency oscillator circuit, but also often use the autotransformer.
2. isolation transformer by the skeleton, the primary coil, shielding, secondary coil and external insulation paper and insulating oil and other components.
Do step-down or step-up use must look at the secondary coil output voltage is lower than 36V, if higher than 36V that is still dangerous.
Isolation transformer should be used before the factory voltage meter to test the insulation resistance between the primary coil and secondary coil. There should be leakage as unqualified products.
Do low-voltage coupled circuit, the waveform distortion depends on the structure of the oscillator circuit, the noise depends on the winding process and the tightness of the chip, which also has a great relationship with the oil immersion.
