When is DC blocking capacitor used?
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Tonic
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Tue Feb 12 2008, 09:10AM
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Registered Member #528
Joined: Fri Feb 16 2007, 10:32PM
Location: Warsaw, Poland
Posts: 166
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I know its purpose is to block any DC signals and let go AC signals. But where and when DC signals appear?
EDIT: Arg, bad forum section. If moderator reads it, I ask him for moving it to Science and Electronic section.
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uzzors2k
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Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
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Usually one uses a DC blocking cap if driving a transformer. This is to keep the waveform symmetrical which prevents the core from "walking into saturation". DC signals appear with single ended drivers or uneven drive. A simple 555 flyback driver is a single ended driver and will have an uneven output for example.
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