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Old 25th October 2009, 07:17 PM   #1
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Default Circlotron Meditations

Circlotron Meditation #1 is posted.

Thank you.

Mike
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Old 25th October 2009, 08:20 PM   #2
flg is offline flg  United States
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Well, it's a floating bridge amp. Even the follower versions would have problems without actually having some Gnd refrence for the inputs and your "first version" has none. I think any of the unmatched components will then cause an unbalanced condition to average. The average is not the center so less canceling wil take place. You probably could do soemthing similar to what the follower types do and that would be to put resistors from the Drains to Gnd. Maybe 50-100 ohms.
But, in the second version what are you actually driving the amp with? There is no Gnd at all. 2 transformer outputs? How do you actually have 2 floating balanced outputs from a source. I think you need those 2 resistors in that version too
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Old 25th October 2009, 08:45 PM   #3
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The drawings are only conceptual.

I had the resistors to ground in my "real" version of the first circuit. There's no voltage gain.

I think a transformer might be one way to go, if you're looking for a single-stage with voltage and current gain.

Has anyone tried it?

Thanks

Mike
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Old 26th October 2009, 12:11 AM   #4
mos57 is offline mos57  Italy
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Quote:
Originally Posted by mrothacher View Post
The drawings are only conceptual.

I had the resistors to ground in my "real" version of the first circuit. There's no voltage gain.

I think a transformer might be one way to go, if you're looking for a single-stage with voltage and current gain.

Has anyone tried it?

Thanks

Mike
Hi Mike i have patented a similar circuit in the 2005.
It is a single stage push-pull circlotron power amplifier.
Overall, this circuit can be employed also with one single unbalanced input (RCA).
Most balanced amplifier circuit need also a balanced input pair, so its left to other the big problem to realize a unbalanced/balanced circuit. But much sound quality depend on a way in which this circuit is realized, so circuit that need only balanced input are simply "incomplete circuit", in my mind.

Further information you can find in my site:

AMPLIMOS one stage amplifiers, amplificatori audio monostadio

Francesco.
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Old 26th October 2009, 12:38 AM   #5
Ejam is offline Ejam  Australia
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Default Inverted Circlotron

Mark

Was thinking about the same thing last week of getting the output stage to provide both gain and power. I came across John Broskie's "Inverted Circlotron" which if you substitute
n-channel mosfets for the tubes shown you have your proposed circuit. I was thinking of doing this with IXYS new IXTH20N50D depletion mosfet which will get around the problem of ground referencing the input with your bias scheme. Attached is the tube CONCEPTUAL version.

Regards

Ejam
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File Type: png inverted circlotron.png (7.7 KB, 896 views)
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Old 26th October 2009, 02:10 AM   #6
ra7 is offline ra7  United States
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Using the said IXYS device:
Two simple Current Amplifiers for low impedance loads

Circlotron from the same page:
http://i700.photobucket.com/albums/w...ynes/CIRC1.jpg
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Old 26th October 2009, 07:11 AM   #7
Ejam is offline Ejam  Australia
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Default Paul's CIR1 Amp

Ra7

Paul Hynes's amp is configured as a follower with the output taken from the sources. Thus the amplifier has only current gain but no voltage gain. Paul gets away with this by using very low impedance speakers (0.75 ohm) that require lots of current and little voltage gain. Voltage gain is provided by a preceding high gain preamp. His amp while very simple and elegant is specifically designed for a very limited application i.e. his speakers, whereas Mark's is better suited to a variety of speakers.

Regards

Ejam
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Old 26th October 2009, 07:52 AM   #8
Ejam is offline Ejam  Australia
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Default MOS57 Your Patent Number?

Francesco

Did a search for your patent and no luck? Care to post the patent or patent pending number.

Regards

Ejam
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Old 26th October 2009, 05:52 PM   #9
mos57 is offline mos57  Italy
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Quote:
Originally Posted by Ejam View Post
Francesco

Did a search for your patent and no luck? Care to post the patent or patent pending number.

Regards

Ejam

The patent was presented in date 28 april 2005 ( publication number ITCZ20050009; publication date 28 july 2005)

Finally the patent was released in date 20 july 2009 with this number: "0001363976"

Its name is "Circuito amplificatore monostadio bilanciato" (description is in italian, sorry).


search link:http://www.uibm.gov.it

or: esp@cenet — results view

Francesco.

Last edited by mos57; 26th October 2009 at 05:59 PM.
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Old 26th October 2009, 10:31 PM   #10
Ejam is offline Ejam  Australia
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Mos57

Well the first web address is in Italian and after 2 hours of guessing at various searchs, I could not find it and the second address merely gives the patent number and the inventor. If it is not too much trouble, could you provide a direct link to the patent.

Ejam
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