Otopia Project - new idea amp

[lineup]

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Otopia Project - new idea amp



so how give a short intro ... i wonder
when i say
'new idea amp' this means
the concept as a whole is new

most every detail can be found everywhere
but isnt this typical for amplifier designing:
most 90% has been used before
it goes like this for Carlos destroyer X
as well as for Nelson Pass & Grham Maynard or BoraOmega

it is your special mixture, blend
that can make & bring something new & unique
... if you are lucky


let me give a few basic information:
------------------------------------------------------------------------------
- bjt & jfet transistors
- some precisision current sources, jfet based
- diff pair input, a la other lineup posted designs last 12 months
- something different from normal Op-Amp style with FB
- means no global feedback from output to input pair
- application, in this case, pre amps, headphone amps
- +/- 15 VDC supply for this first version
------------------------------------------------------------------------------

why i wanted to share
was the attached FFT fast fourier analys
===>> what we want, isnt it
... i just had to show you


.................................................. ..
of course i be back with more
but no hurry - i just got this idea to this circuit a few hours ago
lets see where we are at end of summer
in about 4 months from here


lineup

[destroyer X]

Back to the past...as we did too much confusion and we lost happyness because of that.

regards,

Carlos

[peranders]

Mr. Lycksele how about do something about your secret amp?

http://lineup.awardspace.com/project02.html

I think it's much better to draw a schematic with the idea. The possible pros and cons of your new concept?

[Nelson Pass]

My dog needs new ears....

"Utopia" by Goldfrapp

[lineup]

Originally posted by lineup

Otopia Project - new idea amp
short intro ...
------------------------------------------------------------------------------
- bjt & jfet transistors
- some precisision current sources, jfet based
- diff pair input, a la other lineup posted designs last 12 months
- something different from normal Op-Amp style with FB
- means no global feedback from output to input pair
- application, in this case, pre amps, headphone amps
- +/- 15 VDC supply for this first version
------------------------------------------------------------------------------
lineup

i decided to give http://lineup.awardspace.com/ a face-lift
thanks for your inspirations Nelson & peranders
( I actually had to torrent downloaded goldfrapp special edition .. it is Not Bad music! )

New Lineup Audio style will include:
1. new colours in a soulful shade of blue ..a song title
2. a new Otopia Wallpaper, to match this new-amp-idea
3. detailed description of thinkings behind - along with outcome, result of the same
4. Dated 2007-06-xx, update versions, as eventual improvements are made
5. But dont you worry. Most of my stuff will be faithfully posted here, too.

See attachment for the new look of my website.

The Otopia Wallpaper 1024x768 is a photo I took this winter April 2007
when I visited my old & crippled mother(85) in the high mountains
in beautiful swedish ..11. Highlands ..songtitle from Bob Dylan album-97: Time Out of Mind


Enjoy!
lineup - you man in sweden

[destroyer X]

I have an important message in audio MP3...size is 3.5 Megabytes and the one is returning into your Opera mail.

Please, goto:

panzertoo@yahoo.com

informing another E mail adress that can hold this data size.

regards,

Carlos

[peranders]

Mr X, you can use http://us.filesfrom.com/

[destroyer X]

The one that returned, the message i have already tried to send, and have returned, was to Opera mail i think.

I will wait him to send me an optional mail adress, or his old and good ftp adress.

The message is important, urgent, and will be something that will be important to Line up.

Unfortunately, seems to me that he is sleeping whole day... alike a bear.

His place is cold, and maybe dark in this period of the year i suppose....hummmm, very good to sleep.

regards,

Carlos

[lineup]

Originally posted by lineup
.
let me give a few basic information:
------------------------------------------------------------------------------
- bjt & jfet transistors
- some precisision current sources, jfet based
- diff pair input, a la other lineup posted designs last 12 months
- something different from normal Op-Amp style with FB
- means no global feedback from output to input pair
- application, in this case, pre amps, headphone amps
- +/- 15 VDC supply for this first version
------------------------------------------------------------------------------

/snip/
.................................................. ..
of course i be back with more
but no hurry - i just got this idea to this circuit a few hours ago
lets see where we are at end of summer
in about 4 months from here

lineup

Hello.
Finally got some time to take this idea a bit further.

I will now post the results of current version.
Whether I will reveal all details of my unique circuit, at this place,
or somewhere else
is very much dependent of the diyaudio forum members themselves.
If there is any call for it.
Some little demand for me, my Amplifier stuff and my findings

=============================================


This project [b]OTOPIA[b] is based on several circuits I have published here at www.diyaudio.com in other topics wit my schematics.
The name is losely chosen because there are some OTA functions done.
( Operational Transconductance Amplifier )
I like these OTAs very much and have studied CA3080 in detail.

Other topologies, ideas, designers
that has influenced Otopia is:
- AD767
- My own version of AD767, 'New JFET input Hifi Amplifier'
- Walt Jung articles, for example Diamond Buffer
- My own work on high quality Class A Follower Output stage,
... with fellow member Jerluwoo


This is what current version Otopia HEX Power,
will produce in a Fourier Analyse of harmonics 1-9.

Power output is 1 Watt into 5 Ohm
Gain is as told, +20 dB

This version is a stripped down version,
with AS LOW NUMBER of transistors as possible.
I expect the harmonics spectra to stay as is
but at a much lower level, once I have optimized my circuit.

The important with this amplifier, is NOT the actual THD level,
but the relationship between the 9 harmonics.
Most 2nd and less of the other!


Regards
halojoy

[lineup]

Here is a
BLOCK-DIAGRAM overview of the concept of this amplifier.

It should be noted,
almost all distortion comes from the first Input stage.

And so the FFT Harmonics shown in previous post
are the Harmonics of the
Symmetrical N-JFET + P-JFET input Voltage Amplifier,
with its local Emitter FB.

If there are any questions, I may give away a few details more.
But this amplifier project is far from done.

In the End when things looks 99% right
it is time to publish.

Here or Where Ever else.



Regards
lineup