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Old 17th June 2012, 10:19 PM   #1
7N7 is offline 7N7  United Kingdom
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Default Gyrators

Hullo everybody.

Could some kind soul point me towards a site or thread here that outlines the design procedure for gyrators as active anode (or indeed cathode) loads?

Thanks in advance

Paul
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Old 17th June 2012, 10:24 PM   #2
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Wavebourn is expert in Gyrators .
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Old 17th June 2012, 10:38 PM   #3
7N7 is offline 7N7  United Kingdom
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Originally Posted by Dimitris AR View Post
Wavebourn is expert in Gyrators .
Thanks, let's hope he's seen this!

Paul
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Old 18th June 2012, 12:24 AM   #4
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Originally Posted by 7N7 View Post
Thanks, let's hope he's seen this!
I have no impaired vision yet.
A little bit, but reading glasses help.
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Old 18th June 2012, 12:26 AM   #5
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Quote:
Originally Posted by Dimitris AR View Post
Wavebourn is expert in Gyrators .
I am not the expert actually;
I was the one who proposed it here on the forum for DIY community.
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Old 18th June 2012, 03:59 AM   #6
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Well Paul Merlin Belencowe book Designing Power Supplies for Tube amplifiers has a very goog section on Gyrators . Using a mosfet as device to imitate a choke not that many parts about 4 resistor a zener and a cap. and try Just one thing about music - when it hits you feel no pain go to miscellanea: look at the ted reg and super ted reg . given it about naim gear you get the idea . I been simulating the gyrator with models of real parts but have not raised the bar up to where a anode choke need to be thats at 150 h plus .
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Old 18th June 2012, 04:56 AM   #7
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Triodethom;

what is called there Teddy Reg is not a gyrator. It is a ripple filter made of R-C network and a source follower. Source follower allows higher resistances than would be needed without it, that means lower capacitance is needed for the same time constant. It is nice approach, but it is different: it provides low dynamic output resistance of power supply, and very low ripples.

The question was about gyrator loads of tubes, not about power filters. The essence of gyrator load is a constant current source with servo that keeps stable DC voltage on anode providing high dynamic load resistance.

Paul could use Search function of the forum to find a lot about gyrators here in threads we already discussed.
Nobody wrote a book yet about gyrator anode loads. Probably it was me who supposed to write such a book, but I don't have time even for an article in a magazine, despite I promised to Jan Didden several years ago...

Sincerely,
Anatoliy
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Old 18th June 2012, 08:47 AM   #8
7N7 is offline 7N7  United Kingdom
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Thanks all for your responses. I have found searching to be a bit frustrating, wading through oceans of verbiage.

Anatoliy, with regard to your description (post no 7) I have built and used active anode loads - usually single transistors but sometimes cascodes; it's the rest of it I have to understand!

Thanks

Paul
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Old 18th June 2012, 10:10 AM   #9
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Default Active Choke

Quote:
Originally Posted by 7N7 View Post
Hullo everybody.

Could some kind soul point me towards a site or thread here that outlines the design procedure for gyrators as active anode (or indeed cathode) loads?

Thanks in advance

Paul
Not exactly the same application, but this may be good for reference.

Jaz
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Old 18th June 2012, 01:25 PM   #10
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Would a constant current source get close to high impedance low voltage drop desired here or is the rising impedance of a choke to frequency the goal . What I had being looking at a gyrator and a cap multiplier are very close part count and only slightly different connection , but you point is correct Wavebourn . If I understand you the gyrator gives both high impedance and stable dc voltage . This active device then should have great effect on the sound of the tube would it not ?

Last edited by Triodethom; 18th June 2012 at 01:28 PM.
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