With a gaped core assembly you can manipulate the resonance frequency changing the value of the no-load inductance. Of the magnetizing current (no load current) will not exceed 10%-15% (in our design approx. The current harmonics of the magnetizing current the maximal induction should not exceed 1.3T in an annealed EI core or 1.7T in a C core. In order to avoid the output voltage distortion through Typical core assembly of a loudspeaker audio transformer is gaped EI or C cores with annealed grain oriented steel. In some cases you’ll also need to use the layer insulation.ģ. For a low amount of the winding capacitance you’ll use a double or heavy insulated round wire. In that case 50% of the primary and 50% of the secondary are wound in each section.£Ģ. If the resonance frequency is lower than the maxim operating frequency (in this design 17000Hz) then you can reduce the capacitance (and increase the resonance frequency) using a double section bobbin. In order to keep the leaking reactance low normally you’ll use a single section bobbin. Gaped EI core with 5 mil between E and I, for blocking amplifier DC bias current and the fine tuning of the resonance frequencyġ. Cu, double insulated for small winding capacitance, wound outsideĬu, double insulated round wire for small winding capacitance, wound inside
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