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Originally Posted by Miguel Lopez
Quote:
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Originally Posted by kalee20
You need an RC network with a gain >1 at a particular frequency
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With passive components only? Doesn't that opposes the law of conservation of energy, or even more isn't that a "perpetum mobile"  |
No, you can have a voltage gain >1 with just RC components (though power gain is of course less than 1).
See photo below, which'll make things clearer. So with a cathode follower having a gain > 29/30, you can make it oscillate!