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How to De-solder You'll need two things: Soldering iron - 15-30 Watt for sensitive jobs, You don't want them too hot or they may damage the components. Device to Remove Solder - Either a

Transformers Transformers are one of the major uses of coils. They are made of two or more separate coils of wire wrapped around a common core, normally made of laminated iron sheets. Like so...

Drawing Circuits When designing circuits it is not practical to draw physical likenesses of the components you wish to use. In place of each component a symbol is use to represent it. For example: