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switching transistor

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don mcgrath

New Member
i am an aussie frustrated by supplier of a 20A switching battery charger who will not supply a shot transistor simply marked doy217 . i cant find an equivalent in australia!! it is in series with the primary of a transformer and is controlled by logic circuit which alters the duty cycle of its switching... capacity has to be 250W .. can any one help with a substitute??[/b]


Active Member
If this semiconductor in primary side of transformer, maybe a TRIAC.
When You attach the sematic the help is easyer...
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