1. No load normal load voltage can not get up. This may be because the lm317k chip cannot produce enough output voltage under no-load conditions.
lm317k is an adjustable voltage regulator chip that needs to control the output voltage by adjusting the resistance.
With no load current flowing through the chip, the lm317k cannot generate enough internal voltage difference to achieve voltage regulation.
3. If the lm317k is required to carry the load voltage normally under no-load conditions, you can consider adding an appropriate load current, for example, by connecting a suitable load resistor.
In this way, sufficient voltage difference can be generated inside the lm317k chip to achieve voltage regulation function.