Hi-Link HLK-10M05 5V 10W AC-DC Power Converter (AC to DC Switch Power Supply Module) logic output optocouplers These are Carbon Film Resistor

These are Carbon Film Resistor with a value of 56k ohm 1/2W and tolerance of ±5%

the 3D pen will turn off automatically when not in use for more than 5 minutes

These are Carbon Film Resistor with a value of 27 ohm 1/4W and tolerance of ±5%

This black push button switches things on with this mini SPST momentary push button switch

This preset must be cranked ten times to alter the resistance from 0 to full range

Hi-Link HLK-10M05 5V 10W AC-DC Power Converter (AC to DC Switch Power Supply Module) logic output optocouplers These are Carbon Film ResistorIt's a Hi Link HLK 10M05 5V 10W AC DC Power Converter. This is a PCB mountable module. It has low power consumption, environmental protection, no load loss, high efficiency, and high power density. It also has output overload and short circuit protection. Features It is PCB mountable Low power consumption, environmental protection, no load loss <0. 1W High efficiency, high power density Output overload and short circuit protection Module Power Supply