After this stage further work will go into developing the next kind of prototype, which is known as a 'Design Prototype'. This item is much more similar to the final product, and contains much more detail and accuracy than the 'Proof-of-Concept' design which was made simply to portray how the product will work.

Instead, the 'Design' prototype will resemble the finished product in both aesthetics and function, but it is not yet a completed product. It will serve as a jumping-off point in order for further work to be carried out to refine it. At this stage, not only the product itself but the production process will be refined so that actual production will go smoothly when the time comes.

This item will also be used to gain further feedback from others. As this is basically a draft version of a product, it is a point where its aesthetics and design can still be modified before going into production. In addition to this, this can serve as a basis to develop more prototypes for another round of testing.

The next type of prototype is the 'Production Prototype', which is used to further refine the final design of the product being produced. To give an example, prototype machines and parts can be manufactured in a range of different materials to allow a final decision to be made on the best material to use in the final product.


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Electronic components, including microprocessors and microcontrollers, are typically available in both surface mount and through-hole versions. Some electronic components may be available in only one format (such as some transformers, relays, capacitors, power resistors, or connectors being available only in through-hole packages). Surface mount components are preferred for any volume level production as they are usually less expensive to purchase, more readily available, and allow for more compact printed circuit board designs as the components take up much less space and can be applied to both sides of the board if necessary. Using surface mount technology may allow the printed circuit board design to use a smaller size and/or fewer layers, thus reducing raw board costs. However, surface mount components can make in-house assembly and soldering difficult if not impossible if you do not have the proper equipment and expertise.

The completed design will include a power supply section that will provide the voltage and current levels required by the design's components. Input power options could include plugging the unit into a 120 VAC outlet and converting the AC voltage to the appropriate regulated DC voltage levels internally as part of the power supply design. You could also choose to use an external power adapter that converts 120 VAC to a DC voltage level and then regulates this incoming DC voltage level to the level required by the design. A third option would be to have the product powered by batteries. If your product is to be battery powered, in addition to defining the battery technology and the number of amp hours of power storage in the batteries, you should also consider if a rechargeable battery design or an end user replaceable battery design is best for the product application and pricing.