The function of circuit board binding posts

The binding posts you are talking about are actually what we usually call terminal blocks. Its function is to connect and never function as a rheostat.

Perhaps you should ask: Why doesn’t the circuit board use terminals instead of soldering wires directly? This is a rather nonsensical question. It is also a common sense process:

Who designs the circuit board, who processes it, who makes the external connections, and who is the end user? Do they have the same technical requirements for personnel?

Do you think it is more convenient to use soldering wires or to use a screwdriver for wiring? Or what are the operating skills and external environment requirements for using a soldering iron and a screwdriver? And if it is soldered wrong or screwed wrong, which one is more convenient for modification or repair? Also, are the cable materials and insulation layers used for external wiring temperature-resistant and suitable for welding? Which type of product is more suitable for mass production?

Look at circuit board processing: In addition to washing the board after component welding, some also need to be sprayed with moisture-proof paint. How to deal with the welding process of spray-painted boards?

All the above can be solved by using terminal blocks;

The poster may be a student without any experience or simply a salesman who sells terminal blocks without any problem. The circuit board is a very imitative way of directly soldering wires. It has no merit other than making others laugh.