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Old 2nd June 2009, 03:17 AM   #1
lineup is offline lineup  Sweden
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Cool CHOKE Loaded MOSFET, easy to build

.
Some analyses
of Tyimo Choke Loaded Class A
Single IRFP240 MOSFET amplifier

Fourier Analysis, Harmonics spectrum
at 1 Watt RMS into 8 Ohm

Looks nice.

The power consumption for this first is:
755 mV / 0.54 Ohm
which gives like 1.5 Ampere


when using one PSU 14.5 VDC
(Power supply Transformer is one Big 9 VAC or one Smaller 12 VAC ???)
What is it Tyimo

Shows very nice falling hramonics.
THD is below 0.09 % not bad!
Gain is low .. below x1

/lineup - Investigations In Audio
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Old 2nd June 2009, 07:39 AM   #2
Tyimo is offline Tyimo  Hungary
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Hi Lineup!

Quote:
Looks nice.
Yes!

Quote:
when using one PSU 14.5 VDC
(Power supply Transformer is one Big 9 VAC or one Smaller 12 VAC ???)
What is it Tyimo
200VA 12Vdc

Quote:
Shows very nice falling hramonics.
THD is below 0.09 % not bad!
Oh yeah!

Quote:
Gain is low .. below x1
It needs a good and high gain tube preamp as you know...

Why we aren't in the Pass forum?!?

Greets:
Tyimo
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Old 2nd June 2009, 08:15 AM   #3
lineup is offline lineup  Sweden
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I have already been too much in Pass Labs.
I am only guest occational there. There are other that are more welcome ...... ... ...
One country can only have 1 King.
Two Kings are too much for any regime

SEWA = pass
pass = OTA also by Mads_K
F5 = mosfet in pass labs
B1 = in pass labs
... now is the time Solid State transistor forum
learns how to use HEXFET!

Not only Bob Cordell and the big guys ... should learn this.
Nelson Pass is good with HEXFET from IRF

But think if they learn in here in Solid State.
If they will be thought how to use MOSFETs/HEXAGONAL Structures Die
And so we will make better amps than Nelson Pass
at about year 2015.
This is my hope. We can do it!

When Nelson Pass and Me and John 'jfet' Curl are dead 58, 68 years old already)
we need a few to be able to take over the inheritaged knowledge.
Two very promising for future are: Tyimo & Keantoken(16)
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Old 2nd June 2009, 08:38 AM   #4
lineup is offline lineup  Sweden
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Default IRFP240 choke loaded AC Analysis

.

Here is AC analysis.
Impressive
As my first setup of your Real Circuit shows:

2.2 MHz has rolloff -3 dB
2.3 MHz something for -45degrees Phase .. almost the same.
.. I could have a guess it has been trimmed, for this?

One reason this amplifier can be so fast,
is because the Voltage gain is low. Below 1.
This is one benefit from avoid un-necessary high gains
.. that the bandwidth can stay high.

In short, very good ac behavior and phase.
Superior to many other power amplifiers, I would say.
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Old 2nd June 2009, 05:40 PM   #5
Tyimo is offline Tyimo  Hungary
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Hi Lineup!
Quote:
Two very promising for future are: Tyimo & Keantoken(16)
Oh no. I am under educated and shy..

Quote:
.. I could have a guess it has been trimmed, for this?
No, It is only tuned for musicality.

Quote:
One reason this amplifier can be so fast, is because the Voltage gain is low. Below 1.
Yes, and it has ZERO NFB.

Quote:
In short, very good ac behavior and phase.
Superior to many other power amplifiers, I would say.
Yes and thanks!
I am waiting meanman64's listening impressions. He is also biulding my amp.

Greets:
Tyimo
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Old 2nd June 2009, 06:11 PM   #6
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Did you have a particular part in mind for L2? The reason I
ask is I saw a little discussion on Tubecad about the fact
that most chokes unless made for audio use distort AC a lot.
Then the author recommends adding a air core in series with
the iron core choke. The author compared this to adding
a film bypass cap for an electrolytic cap. Here is one example
of someone doing this.
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Old 2nd June 2009, 06:20 PM   #7
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Ummm... aaaaa... Nelson Pass published this idea with Mosfets I think like 20 years ago now... then he did the Zen... I did my DC coupled SE Mosfet, then Nelson did a ton more, and I didn't...



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Old 2nd June 2009, 06:23 PM   #8
wg_ski is offline wg_ski  United States
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I think it's just going to take a big gapped core. 120mH at an amp and a half is a tall order. Probably not impossibe, but beware of sticker shock.
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Old 2nd June 2009, 06:25 PM   #9
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Default This is a real clever schematic...congratulations if you did it Lineup


of course, we cannot be original as we are in this world of fast coomunications... this idea, the choque coupling, remembers the amplifiers from the fifties (great times).

Into the fifties they used a transformer primary as the transistor or tube load, and the secondary was to the speaker.

this one is nice...only 1.5 amperes.... low voltage....low power consumption and around 25 percent efficiency.... good idea..this one is very interesting.... post the complete schematic please.

I know it is impossible to be the first to have ideas...now a days we can only produce Frankensteins products..as even if we create something, it belongs to mankind...someone had the same idea..or something alike, years or decades before.... hard to discover things now a days.

Congratulations...lovely one.

Carlos
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Old 2nd June 2009, 06:26 PM   #10
Tyimo is offline Tyimo  Hungary
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Quote:
Did you have a particular part in mind for L2? The reason I
ask is I saw a little discussion on Tubecad about the fact
that most chokes unless made for audio use distort AC a lot.
Then the author recommends adding a air core in series with
the iron core choke.
L2 is a gaped iron core.
Yes, the air core measures better on paper, but in the reality you would lose the power efficiency because of the very high Rdc of the air core. You don't need to care about the distorsion of a good gaped iron core.

Tyimo
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