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Old 3rd October 2008, 09:50 PM   #1
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Default The Amazing Fet Circlotron by Mike Rothacher

Mike Rothacher wrote a great project article and allowed us to
put it up on


I'm sure you will all enjoy it.

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Old 3rd October 2008, 09:52 PM   #2
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This should be Interesting. Ralph Karsten from Atma-Sphere is a friend of mine and we talked about something like this long ago.

off to read the article now!!
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Old 3rd October 2008, 10:17 PM   #3
Fuling is offline Fuling  Sweden
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Very interesting!
I recognize the circuit, Circlomanen made something VERY similar a couple of years ago
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Old 3rd October 2008, 11:02 PM   #4
Magura is offline Magura  Denmark
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That is one very interesting (and well written) piece.

Old wine on new bottles, sure, but with enough attention to detail., to allow anybody to keep up.....even me

Everything is possible....to do the impossible just takes a little while longer.
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Old 4th October 2008, 01:36 AM   #5
EUVL is offline EUVL  Europe
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Old 4th October 2008, 02:17 AM   #6
EUVL is offline EUVL  Europe
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BTW, a pair of the the cascoded LU1014 a al ZV9 will make a simple yet excellent Circlotron Follower.

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Old 4th October 2008, 03:26 AM   #7
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Anyone wanting to build one of these should do so soon. The 2SJ74 was discontinued at the start of the year. Some of the distributors will have them in stock for another year or so, but after that they will become very difficult to find.
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Old 4th October 2008, 04:46 AM   #8
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Can a circlotron work in low bias classAB, or classA is a must?
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Old 4th October 2008, 10:04 AM   #9
Gyuri is offline Gyuri  Hungary
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Obliged producing an amplifier like this for myself will be me.
Those who would have deserved the life they are all dead already. "Oh, my dead dears!" - Captain Cat
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Old 4th October 2008, 11:24 AM   #10
bappe is offline bappe  Sweden
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Default Another take on the subject.

Very nice and well written article!


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