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Author Topic: PWM 3V 200mA High Power Led from 3v soure  (Read 1295 times)
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It's from the website you pointed me to

http://www.pcbheaven.com/userpages/LED_driving_and_controlling_methods/?topic=worklog&p=3
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If you use a germanium transistor then that 0.7V becomes 0.25V.
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