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Old 28th August 2003, 12:21 PM   #1
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Default Gyrators ?

Hi there.
I've read a few places that there are 3 ways of making a gyrator circuit, but only very little of technical kind, like detailed circuit description and equations.
Anyone got any links or literature, where I can learn more, and satisfy my theoretical couriousity?
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Old 28th August 2003, 12:38 PM   #2
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Tietze-Schenk (the EE's "bible") is one place where it is described quite well.

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Charles
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Old 28th August 2003, 03:37 PM   #3
eLarson is offline eLarson  United States
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Quote:
Originally posted by phase_accurate
Tietze-Schenk (the EE's "bible") is one place where it is described quite well.
Uh oh... I must have become a heathen somewhere along the
line. What's the title?

Thanks,
eL
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Old 28th August 2003, 03:56 PM   #4
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When you say gyrator, is that the same as oscillator as in the Hartley, Colpitz and Armstrong oscillators that the FCC used to want me to know all about?
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Old 28th August 2003, 05:54 PM   #5
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Default Gyrators?

Hoffmeyer,

If I remember correctly, I had a book, Transform Methods in Circuit Analysis by Harrison, that describes mathematical methods in a discussion on gyrators. He shows a couple of examples of how to use them to simulate inductors in filter circuits. The whole dicussions was based on op-amps. I think the book is out of print and was not very popular so, it may be hard to find it.

Later,
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Old 30th August 2003, 03:10 PM   #6
DUG is offline DUG  Canada
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try this....good apnote from national

http://www.national.com/an/AN/AN-435.pdf
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Old 30th August 2003, 03:35 PM   #7
SY is offline SY  United States
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One thing I haven't seen but am tempted to play with is the use of chip amps to make power gyrators for speaker crossovers. It might be cool for doing "infinite-slope" sort of implementations or shaping LF response.

Quote:
is that the same as oscillator as in the Hartley, Colpitz and Armstrong oscillators that the FCC used to want me to know all about?
Wow, it's been more than 35 years since I sat down in the little test area in our local FCC office for my Advanced ticket. I remember Hartley and Colpitts, but not Armstrong. What is that? (There was also a Pierce, which IIRC was crystal-based)
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Old 30th August 2003, 03:41 PM   #8
haldor is offline haldor  United States
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Rod discusses Gyrators in this parametric eq project.

http://sound.westhost.com/project28.htm

I've built this circuit and it works. Just be sure to add a 100 ohm seies resistor in the output to prevent oscillation when driving cables.

Phil
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Old 31st August 2003, 02:41 AM   #9
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Default memory fails me....

Quote:
but not Armstrong.
Yikes! I'm not so sure right now, have to go hit the bookcase tommorow to if I got the name right and what it might be.

Whats your monkey smoking?

-Dave
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Old 31st August 2003, 03:08 AM   #10
SY is offline SY  United States
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Whats your monkey smoking?
You win the prize for being the first to notice. Yes, it's what you think it is. This is a monkey who will never get around to doing anything other than hoovering Ding-Dongs and getting Phish concert tickets.
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