A tap is mainly used in a transformer . Both the primary winding and the secondary winding can contain several taps. One or more taps on the primary winding of the transformer allow different primary voltages to be fed in, whereby only one output voltage is transformed. One example of this is a transformer that is used for the European and American markets. Different tensions prevail in the areas of application. In the European market it is 230 volts and in the American market 120 volts. The transformer can be used in both scenarios thanks to the tap on the primary winding. The secondary winding can also contain one or more taps. The secondary winding has taps if several output voltages have to be generated from one input voltage. There is also a special type of tapping, the center tapping. The winding of the secondary side is cut and tapped after half of the turns. This type of transformer is used as an output transformer for push-pull power amplifiers and to supply a two-way rectifier.

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