Dilshan Jayakody writes:
Audio output transformers are heavily used in vacuum tube and some (older) transistor base audio power amplifiers, but these days output transformer are quiet hard to find and expensive item. For homebrew projects the best option is to construct those transformers by ourselves and this script helps to calculate winding parameters for those transformers.
This “AF output transformer calculator” script is written using Python and it works with most of the commonly available Python interpreters.
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The script is available at elect.wikispaces.com.
Details at Dilshan’s blog.