A linear PLL includes a VCO with first and second tuning elements. The frying machine includes a partition, which is provided in the vessel to partition a space in the vessel into a heating space and a frying space and comprises a horizontal part and a vertical part. Then, the coupled non-resin-infused portion is infused with resin to create a second resin-infused portion and a second non-resin-infused portion. In operation, the touch display panel has a content display region and a touch menu region with adjustable sizes. A second delay time is generated after the second switch is turned off and before the first signal is on.