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bi-circleton
bi-circleton
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Old 15th March 2018, 07:47 AM   #1
kokoriantz is offline kokoriantz  Lebanon
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Default bi-circleton

Most beautiful sounding amplifier.
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Old 15th March 2018, 09:39 AM   #2
meanman1964 is offline meanman1964  Belgium
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Gonna follow this .
Any layout yet ?
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Old 15th March 2018, 12:44 PM   #3
xrk971 is online now xrk971  United States
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bi-circleton
If you mean bi-circlotron, I don’t think it is a circlotron topology. Circlotron would require the output to be floating with respect to GND. The outputs are tied to GND and so is one terminal the speaker. If I unwrapped this and moved everything to the left, you are left with a SE Class A with a CCS made up of the right side (albeit with a twist) with a depletion mode n-channel MOSFET input stage (mimicking an N-JFET).

I think a true circlotron requires dual isolated power supplies, no fixed GND on speaker.

But, that doesn’t mean this isn’t a good sounding design - it’s nice to see alternative to JFET on input.
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Last edited by xrk971; 15th March 2018 at 12:51 PM.
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Old 15th March 2018, 03:16 PM   #4
Ketje is offline Ketje  Belgium
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Did look familiar, i have seen something like that before
Circlotrom,pootje meer want anders - forum.zelfbouwaudio.nl
Mona
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Old 16th March 2018, 01:00 PM   #5
kokoriantz is offline kokoriantz  Lebanon
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there is no circlotron or Q S C in this amplifier .
It is a new type of its kind
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Old 12th May 2018, 07:18 AM   #6
padamiecki is offline padamiecki  Poland
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Quote:
Originally Posted by kokoriantz View Post
Most beautiful sounding amplifier.
Hi Kokoriantz!
Clever!
Why did you choose DN2540?
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Old 12th May 2018, 09:39 AM   #7
hajj is offline hajj  Lebanon
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Kokoriantz, your profile shows a Lebanese flag, are you in Leb?
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Old 12th May 2018, 11:27 PM   #8
kokoriantz is offline kokoriantz  Lebanon
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Thank you padamiecki for being interested with this amplifier . If you look on page 5 of the datasheet transfer characteristics curves , you see at 100ma bias gets an inflation point . At this point it becomes very low distortion but of odd order . Adjusted by ears compared to 300B amp ,it gives extraordinary resemblance at 75ma to 85ma depending to the heat sink size . I can even say in many aspects the bi-circleton is more pleasant. I am preparing a layout PCB as Meanman1964 requested , I'll post on YouTube a comparative listening with 300B/2A3C in about 2 months .

Hajj ,my greetings from Vietnam.
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Old 15th May 2018, 01:58 AM   #9
Pascal Nguyen is offline Pascal Nguyen  Australia
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Default Another solid triode ?

Quote:
Originally Posted by kokoriantz View Post
. . .If you look on page 5 of the datasheet transfer characteristics curves , you see at 100ma bias gets an inflation point . . .
Thanks for sharing this information.
I haven’t build the whole bicycle yet, just a mono wheel, very impressive performance.

Regards from Pascal
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Old 15th May 2018, 02:55 AM   #10
alexberg is offline alexberg
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It's a push-pull gain stage with I-V conversion in signal path, capacitive coupling and floating PSU.
What's the purpose? Making simple things hard to make.

Last edited by alexberg; 15th May 2018 at 02:56 AM. Reason: Second line added
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