I agree that transformer is symmetrical i.e. input to output ratio is equal but as soon as it is put to some use, it acquires input and output as per of requirement or objective of the situation. Baluns are no exception, they are signal level transformers.Hello,
I'd like to know why Balun tranformers have an input and an output. A transformer is, in theory, symetrical.
See p7 and p8 of enclosed .pdf.
I agree - the labels in fig.'s 5 & 6 are a little confusing, but, T2 in fig. 5 is a classic example of a choke. For a goodThe device labeld as T2 in Figure 5 is not a balun/transformer -- it is a common-mode choke. Fig 5 is in error. T2 should be as shown in Fig 6.
Baluns are bi-directional in fact, but if they are used in a uni-directional circuit as shown, the terminals may be named "input" and "output" by convention.
In eithernet systems that use cat-5 cable, the Tx and Rx are transmitted over two different uni-directional twisted pairs, so they must be processed by two different uni-directional systems, each with its own isolation transformer / balun.
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