Quantity   Component name
1 × SIP3 12V 500mA switching regulator accepts 24V input from 24V PSU
1 × SIP3 5V 500mA switching regulator accepts 12V input from 12V switching regulator
3 × 10uF or 22uF ceramic capacitors bypass capacitors according to regulator datasheet
1 × 2-pin screw terminal 24V input connector
4 × 20-22 AWG wire connects to fan controller
2 × R1.25-3.5 ring or spade connectors connects to 3D printer PSU terminals
2 × 2-pin headers connects to fan controller cable
2 × 2-pin JST-XH cable connector one for 5V, one for 12V
1 × 4-pin JST-XH cable connector connects to fan controller
2 × 18 AWG wire connects to 3D printer PSU
1 × 500mA fuse (trip 1A) protects the wiring
1 × 1.5A rectifying diode prevents reverse polarity and reverse current