The enormous development of electronics over the past decades has also affected our homes. The term Smart Home is no longer a stranger to anyone. Home Assistant undoubtedly has its place among the various Smart Home systems. 
One of the important devices in the production of printed circuit boards by the photo process is the exposure unit. Its construction, for radio amateur needs, is described in this article.
The huge boom in the production of electronics and its components also affects the work and creation of radio amateurs. New components bring new possibilities by improving functionality and expanding their capabilities. The reduction of chip sizes comes hand in hand with the reduction of case sizes and the introduction of new types. The vast majority of new parts and new cases are designed for SMT (Surface Mount Technology). The use of such components in radio amateur practice brings many pitfalls, one of which is soldering.
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