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#7
October 26th 08, 02:40 PM
posted to rec.radio.amateur.homebrew
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I built a 7.5VAC 21Amp transformer now it has lots of buzz
Uh! Sorry Ray, it was near 2AM and I misread this. Of course there's no gap in the core it's a linear AC transformer. No DC in the windings and so no gap. Usually I'd do everything I can to reduce any gap, inclduing interleaving the laminations, to reduce the magnetizing current. I just wasn't thinking, that happens sometimes. raypsi wrote in news:ea79280c-6148-42a5-be23- : Shimmed the bobbin in the core window with some 1/8 thick virgin teflon. Epoxied the windings to the bobbin. This was a 240VA transformer and now is a 83watt buzzer / 157watt filament transformer. |
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