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Old 30th Aug 2019, 12:56 pm   #38
G6Tanuki
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Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,956
Default Re: Interstage Audio coupling transformer

Yes the advice about supporting the bobbin cheeks while you wind is *very* pertinent. I once wound an inverter transformer (to get 450V@150mA from 12VDC) using a colour LOPT as the core - made up nice Paxolin-sheet bobbins but the unsupported cheeks bulged when I wound them and then when the two cores were fitted there was about a 1mm gap between the ends.

Which contributed to about a 10% reduction in efficiency!
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