Schematic symbol for ferrite bead? - diyAudio
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Old 22nd February 2010, 03:22 PM   #1
Electrons are yellow and more is better!
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Default Schematic symbol for ferrite bead?

I'm looking for a symbol for ferrite beads. Is there a standard for it?
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Old 22nd February 2010, 05:26 PM   #2
marce is online now marce  United Kingdom
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We use a standard inductor symbo, but marked for example '600R 100MHz' instead of its inductance, plus we use the name stem FB instead of L so the high speed router and SI dont class them as inductors.
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Old 22nd February 2010, 06:30 PM   #3
49 - for the 18th time
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This should work - pretty easy one to draw too!!
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File Type: gif Ferrite Bead v2.gif (4.8 KB, 180 views)
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Old 23rd February 2010, 12:45 PM   #4
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i've seen them drawn several different ways. one as a piece of wire with a square superimposed like the one above (most common) sometimes the square is greyed, but also as a circle superimposed. occasionally i see one drawn as a single loop as in an inductor symbol, sometimes with a bar above it (as in a ferrite core symbol), there are a few shown below that i have seen. remember schematic symbols are usually somewhat "descriptive" of the device, so there are usually some variations on the "standard" way to draw them. there are standard symbols, and there are variations of those standard symbols. it used to be the choice of whoever was drafting the schematic (or whatever symbol templates he had on hand). these days, it's the symbol library in the software (usually). unfortunately the first one can be confused with a fuse.
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File Type: jpg ferritebeads.jpg (10.2 KB, 144 views)

Last edited by unclejed613; 23rd February 2010 at 12:47 PM.
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Old 23rd February 2010, 12:45 PM   #5
marce is online now marce  United Kingdom
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Also found these (and other variations), so as usual no correlation between standards. My vote goes to c2cthomas and IEC 60617.
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File Type: gif ferrite-bead-symbol.gif (1.1 KB, 146 views)
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File Type: pdf FB-2612-1-2pdf.pdf (25.2 KB, 56 views)
File Type: pdf FB-2612-1-1.pdf (45.0 KB, 42 views)
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Old 24th February 2010, 04:53 AM   #6
Electrons are yellow and more is better!
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Thank you guys.
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