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Old 29th December 2018, 03:47 AM   #1721
vdljev is offline vdljev  Argentina
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Thanks, Perfect then! gonna order that set and worry later how to get things connected and adjusted... Probably gonna make my own thread to not post losts of newbie questions here.
Regarding my mother has recently made a ground connection in her house for a ceramic cooking oven i´m gonna make this amp there with help of someone more experienced in electronics so risks are reduced at minnimun. News will be posted!

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Old 29th December 2018, 08:37 AM   #1722
Elvee is offline Elvee  Belgium
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There is also a build thread, with lots of practical information:
Building Elvee's Circlophone: Documentation, Parts, Accessories, & beginner friendly
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Old 22nd June 2019, 07:38 PM   #1723
minek123 is offline minek123  United States
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LV, I'm building Circlophone with cascode transistor in place of D8/D9.
The base of this transistor in referenced to the output of the amp.
Would it make a difference if it was referenced to the ground?

Thanks
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Old 22nd June 2019, 08:00 PM   #1724
Elvee is offline Elvee  Belgium
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The practical difference would be tiny, but the cascode reference should definitely be tied to the output (from a theoretical perspective).

The subject has already been discussed here:
♫♪ My little cheap Circlophoneİ ♫♪

And here:
♫♪ My little cheap Circlophoneİ ♫♪

And probably elsewhere too, but you get the idea
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. .Circlophone your life !!!! . . ♫♪ My little cheap Circlophoneİ ♫♪
Electrify your daily life!!! ....⚡⚡ ELEKTRIA ⚡⚡
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Old 12th July 2019, 01:48 PM   #1725
tnvijay is offline tnvijay  India
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Hi Elvee,
I am now very much convinced that circlophone is one great design and offers musical bliss, very near to my everfavourite JLH69. Recently I did a AB comparison with JLH69 and circlophone ( standard circuit, with TIP3055 output). I would say the Circlophone approaches Jlh sonics almost 95 percent,the small deficit is my perceived lack in the highs.( Noticeable only on AB comparison) Otherwise, as I previously posted, Circlophone Rocks!!.Now, I would like to build another circlophone,this time with powwrflux layout.. I plan to use 2sd1047 as the outputs. Can I expect a better high frequency performance when compared to TIP3055?

Second, Given a lot of positive response for the subjective musical perception by all the builders, can I request a FFT of the circlophone with FFT of a JLH 69? Say at 1khz and 1 watt output? It's just to reaffirm that whether the Extremely pleasing sonics are due to the harmonic spectrum distribution.Apologise if such a comparison has already been done, I read many times thorough the forum and I could not locate a FFT graph...or may be I missed something?
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Old 14th July 2019, 10:50 AM   #1726
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by tnvijay View Post
Can I expect a better high frequency performance when compared to TIP3055?
Yes, it is several times faster than the 3055

Quote:
Second, Given a lot of positive response for the subjective musical perception by all the builders, can I request a FFT of the circlophone with FFT of a JLH 69? Say at 1khz and 1 watt output? It's just to reaffirm that whether the Extremely pleasing sonics are due to the harmonic spectrum distribution.Apologise if such a comparison has already been done, I read many times thorough the forum and I could not locate a FFT graph...or may be I missed something?
Here is the comparison, in sim because I don't have a JLH handy and my means of spectrum analysis are limited at the moment.

Both circuit are the plain vanilla versions, 1W/8ohm
Attached Images
File Type: png SpectrCompar.png (107.1 KB, 216 views)
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. .Circlophone your life !!!! . . ♫♪ My little cheap Circlophoneİ ♫♪
Electrify your daily life!!! ....⚡⚡ ELEKTRIA ⚡⚡
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Old 15th July 2019, 07:28 PM   #1727
tnvijay is offline tnvijay  India
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Thanks Mr.Elvee, No wonder why the circlophone sounds wonderful..I am going to build another circlophone,this time with metal film resistors and 2SD1047
I will keep you updated once when it's done.
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Old 16th July 2019, 11:53 AM   #1728
tnvijay is offline tnvijay  India
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The 2nd 3rd 4th and fifth harmonics are maintained proportionately between both,while the higher harmonics totally vanish in JLH, it still persists in the circlophone, Although, it is well below 120dB.Anyway to tame those too?
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Old 16th July 2019, 08:47 PM   #1729
Elvee is offline Elvee  Belgium
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There are probably a number of things to consider: first, the harmonic profile of the JLH may be more attractive, at least in relative terms, perhaps because the JLH is not symetrical, unlike the C.

The C is probably one of the most symetrical amplifier currently available, despite its superficial look.
Openly symetrical amplifiers like the symasym are in fact less symetrical, because they rely on complementarity, which is never perfect whereas the C uses identical transistors in a "horizontal" symetry rather than a vertical one.
This symetry mostly eliminates certain categories of harmonics, mainly even-ordered ones, and also favors interactions between those remaining.

The result is an overall reduction of THD, and an apparently extended spectrum.
Apparent, because the absolute level of higher order harmonics is completely insignificant, even if you don't believe in masking effects.
The scale of the two graphs is misleading, because the LTspice autorange opted for a 30dB lower floor for the C, which changes the perspective.

We also have to take sims and even measurements with a pinch of salt: when you arrive at -120dB, a tiny detail can change everything: in particular the matching, which determines the symetry.
Even if you match all the transistors of a C, it won't be perfect, and some of the higher harmonics of the sim will vanish, to the expense of lower order ones.
The result will be a slightly higher global THD level, and a more pleasing profile -superficially and visually, at least-.
Remember that you don't hear with your eyes, and that large scale, blind tests show that the general population tends to prefer a completely neutral, distortionless and flat reproduction rather than "engineered" concotions.
This is why I try to adhere to relatively simple, objective principles.
People like tube sound, especially for instruments, digital effects, frequency enhancements but for general reproduction, a completely neutral system is probably optimal: you can always add enhancements and corrections where needed.
If your amplifier already has a character, it cannot be undone.
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Electrify your daily life!!! ....⚡⚡ ELEKTRIA ⚡⚡
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Old 17th July 2019, 02:36 AM   #1730
gannaji is offline gannaji  India
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Dear LV,
Ref to your single supply mod as given in post 901, ♫♪ My little cheap Circlophoneİ ♫♪
Has any body built it and any specific recommendations ?
Anybody developed a pcb layout for that single supply mod ?
--gannaji
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