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Classic Plus and Minus DC Power Supply
Classic Plus and Minus DC Power Supply
作者: 匿名用户
摘要:
This is a classic example of a regulated DC power supply that produces both a positive 15v and a negative 15v from a 20vac wall adapter.

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Very Loud 3v Powered Beeper
Very Loud 3v Powered Beeper
作者: 匿名用户
摘要:
Getting a high sound intensity from a piezoelectric type beeper is not easy when the available DC supply is only 3v.  The circuit below is not only efficient but produces a very intense sound.&nb...

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