Transformer "Ratios."
The secondary of every audio transformer should have the largest number of turns practicable if snaximum step-up is aimed at. The primary, on the other hand, should be designed to have a suitable impedance for the detector or amplifier to be used with it, The primary impedance is the most important factor to the user, and in the uewer models is considerably increased, in some cases to over 100 henries. A low impedance transformer is most suitable to follow a crystal.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280330.2.29
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Radio Record, Volume I, Issue 37, 30 March 1928, Page 11
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83Transformer "Ratios." Radio Record, Volume I, Issue 37, 30 March 1928, Page 11
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