5V 4A power supply for simple circuit
there are plenty of options...
don't know what your best dealer or online shop is, but for a PCBs things like that work perfectly:
https://www.reichelt.de/stecker-buchsen-c7538.html?&amp;nbc=1
...
https://www.reichelt.de/leiterplattenklemmen-c7541.html?&amp;nbc=1
you get em in all sizes, for all currents. Just search / ask for some good shops in your area of the world.
Maybe you even want such gernan called &quot;Federzugklemme&quot; (spring-type terminal) where the contact is achived with a stong metal spring. they have perfect contact. skrewed terminal might get loose by vibration. spring-type terminal are the better choice in that case
https://www.reichelt.de/federkraftklemme-steckbar-2-pol-rm-5-00-sp-02-5-vbpc-p159608.html?&amp;trstct=pol_8&amp;nbc=1
https://www.reichelt.de/federkraftklemme-3-pol-0-08-0-5-mm-rm-2-5-ast-021-03-p72167.html?&amp;trstct=pol_12&amp;nbc=1