There are three basic types of prototyping, Bread board, Presentation prototype, Pre-production prototype. A bread board is also called protoboard; used to make temporary circuits for prototyping.
Presentation Prototype is often used for promotional purposes and it is the representation of the circuit as it will be constructed. It should be able to demonstrate what the circuit can do, but it is not necessarily an exact copy of the final product. Whereas Pre-Production Prototype is the final version of the PCB from how it is manufactured to its final functionality.
Rapid Prototyping is also known as Desktop prototyping takes advantage of computer technology to turn designs into three dimensional objects. It is a process by which a computer program, CAD (computer aided design), creates 3-D preliminary designs before finalizing a final product. This is very fast and sample circuits comes in working condition in hours and can be debugged easily.
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Prototyping is the process of testing out new idea by creating an introductory model from which other models are created or copied, and it is one of the most common uses for breadboards. If someone is not sure how a circuit will work under a given set of parameters, it is best to build a prototype and test it out.
The main idea is here to build an actual circuit to a theoretical design to verify that it works, and to provide a physical platform for debugging it if it does not. The prototype is performed by different techniques like bread board. This PCB prototype is constructed base on current requirements and gives function of actual circuit.
For college and university students PCB prototypes are best place to start learning electronics and circuits. The PCB prototype is usually not complete circuits and many of the details are not built in the prototype. The goal is to provide a circuit with overall functionality.
Main advantages of prototyping are clients can be actively involved in the procedure, Errors can be detected earlier and can be fixed, Missing functionality can be identified easily, Confusing or difficult functions can be identified.