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Old 30th May 2009, 03:32 AM   #31
lineup is offline lineup  Sweden
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Lumba Ogir
Just dont tell me what to do.
tank u

Just because you are not lucky to have a good sim
does not mean we all, that like to use them, should do like you

If you prefer your imagination, which is much more virtual than a good simulator of reality,
then this is your own decision

horrible if we edcuated out pilots for passenger airplanes
in imagnary & hypotetic models, just out of human subjective thinking.
I would not want to ride in such a plane.
I prefer those that has excercised emergency situations baed on matemaical virtual softwares.
Modelas of reality.

I get you do not even use roadmaps .. but does this make easier for you to find your way.
And you do not look at local weather forecast, cretaed by simulations of real data from stations
.

A roadmap is a virtual representation of reality.
And it works well. Do you have a car?


Same with the precision tools we use to represent electronical circuits.
They are based on real data, often a good average of the qualities of real components.

Imagniation & unprofeed hypotesis can be fun for you
but let's separate facts & figures from subjective an not validated thinking about real circuits.
They are often much less valid than the models I use here.

I end here with my weather forecast in first post.
It tuns out it came true. Not dificult to know this in advance.
It was based on empirical observations od www.diyaudio.com reality
Quote:
Be back with schematics, AC-analyses and Fourier for discussion/evaluation.
All is properly tested in virtual circuit with some of the best instruments we can find.
On the commercial ground my simulator costs way too much.
---

From this we can forsee, that this topic will not discuss my circuit.
But people will do more postings of the usual debate on using sims, paper or calculator
or design by listening to transistors output through headphones of different qualities
after throwing it quickly together with solder.
thanks
linie - lineup
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Old 30th May 2009, 03:53 AM   #32
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lineup,
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On the commercial ground my simulator costs way too much.
Wasted money.
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Old 30th May 2009, 04:35 AM   #33
lineup is offline lineup  Sweden
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If you want to discuss my circuit
and the testings of it .. then welcome, Lumba.
I wont feed the trolls here.
I let others do that

much regards to you for being intesrested
and read and learn some real things

yours linie
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Old 30th May 2009, 01:05 PM   #34
lineup is offline lineup  Sweden
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.


AC Analysis of Version 7b (with diode optimized output).

The GBW (voltage gain x upper bandwidth limit)
of this version is = 29 MHz
Closed loop Gain = 6.50
Closed loop max stable Bandwidth = 4.50 MHz

I decided to use 33p Miller to get the upper freq to rolloff at 1.2 MHz.
By doing this I do not need so heavey a filter at input of JFET
and so risc some corruptions of frequency curve, because of how I adjust My volume pot.

After all I am not designing ShortWave radio circuit here,
but a real Hifi Headphones amplifier
conerning with good reproduction of audioband: Max 20.000 Hertz (=0.020 MHz).

Not much to comment else. But if you have any questions I may consider answer you.
Trolls like Lumba can be at times
and other destroyers of my good threads .. dont bother, please

I will try to ignore stupid comments as much as my mind allows me.


/lineup the cool guy .. at least this morning
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Old 30th May 2009, 01:32 PM   #35
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Thank you lineup, for your informations ... i'll check the links you mentioned.
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Old 30th May 2009, 01:42 PM   #36
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lineup,
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I decided to use 33p Miller
A woeful decision.
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Old 31st May 2009, 07:12 PM   #37
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Hi Lineup,

I just soldered the following amp for my cans ... since i had all parts available here it was a short run ... very impressive how powerfull it is ... Driving 40 Ohms (Sony), 62 Ohms (AKG), as well as Senns @ 600 Ohms ... i very content with it ... son now the finish of the enclosure and all will need about a ten or twenty times more time then the soldering ... pah ...

Have a peak :
Schematic

Source

I found the link from a post from you here in the forum ...
So thanx for the hint.

EDIT:
BTW i forgot to say ... this amp can make'em sound really loud !

regards
artQuake
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Old 5th June 2009, 08:05 AM   #38
lineup is offline lineup  Sweden
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Default 12 Volt operation

For 12 volt operation
we can start thinking 2SK170BL or 2SK170GR
.. in fact in my 12 volt version I used 2SK170BL
running at like 0.5mA for input.

For 24 V .. the 2SK170 might give a little too high voltage gain
.. especially for 16/32 Ohms phones.

For 12 Volt and 32 Ohms .. 2SK170 input like in my design here
will work very well.

/line 'linie' lineup one designer
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Old 8th June 2009, 12:36 AM   #39
lineup is offline lineup  Sweden
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Cool 2SK170BL JFET Headphone for 12 Volt DC

.

My recommended circuit for 12 VDC.
Phreaking low distortion !!!!
if you can find one optimal resistor: R4=96.5 Ohm
Because this base stopper removes a lot of 2nd harmonics dist
in output stage.

Changes:
1. JFET 2SK170BL (IDSS=8mA) set at 0.5mA operation
2. ZVP3306 ZETEX great TO-92 P-MOS, set at 10 mA operation
3. BD140-16 as output for 120 mA bjt Class A operation,
into 33 Ohm power resistor


Enjoy !!!
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Old 4th July 2009, 08:28 PM   #40
Bigun is online now Bigun  Canada
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Now this looks very interesting ! -- I like the FET driving the BJT.

I wish I had some headphones now
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