Topology Federmann, HQQF-55 ... - Page 2

Federmann · 30th October 2009, 06:34 PM

Characteristics of my drivers HQQF-55-502D, amplification without feedback. I set up to focus on flat transmission characteristics. Warning phase characteristics of the different scale

stinius · 30th October 2009, 06:36 PM

Quote:

Originally Posted by tiefbassuebertr

But the input circuit looks very interesting

The input circuit is pretty conventional isn’t it?

What about gate stoppers?

Cheers

Federmann · 30th October 2009, 06:39 PM

Characteristics of drivers HQQF-55-502D feedback and intensifying 26dB, is worth noting a very small phase angle in the acoustic band, watch a different phase characteristic scale

tiefbassuebertr · 30th October 2009, 06:42 PM

Quote:

Originally Posted by stinius

The input circuit is pretty conventional isn’t it?

What about gate stoppers?

Cheers

you are right. the kind of schematic drawing got me confused - it is a mirror symmetric differential amp for high open loop gain, that is find in some amps.

Federmann · 30th October 2009, 06:52 PM

Input circuit drivers HQQF-55-502D is in no way exceptional, but the currents are unusually large, the result is:

• Increased gain
• Flat Specifications
• Small Udif (differential voltage input)

Stages Ufif

PMA · 31st October 2009, 11:15 AM

I know that we shall see no distortion measurements. Only a sort of nothing saying simulations. Maybe a photo of a finished amp, and oscilloscope screenshots as well??

Federmann · 02:47 PM

PMA is certainly right, but the simulations SPICE_kompatibile usually very not different.

Preparation for construction.

Federmann · 31st October 2009, 02:44 PM

Current form, the assessment and fitting end transistors. He will be measured.

Upupa Epops · 31st October 2009, 07:08 PM

Oh, I see...at this point your PCB make fuse effect, trace is correctly wide - very clever... :-)
Not wash yet ? And what are these disgusting spots on the left side ? Perspiratory relicts of intensive soldering ? :-)

Upupa Epops · 31st October 2009, 09:20 PM

I am not talking about lines commonly, but only about one - between Boucherot devices...there I see only c. 0,3 mm, which is little bit thick...but maybe after some drinks I will see something different like you... :-)

31st October 2009, 11:15 AM	#16
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	I know that we shall see no distortion measurements. Only a sort of nothing saying simulations. Maybe a photo of a finished amp, and oscilloscope screenshots as well?? __________________ Pavel Macura, consultant http://cz.linkedin.com/pub/pavel-macura/4/783/637

31st October 2009, 02:41 PM	#17
Federmann diyAudio Member Join Date: Oct 2009	PMA is certainly right, but the simulations SPICE_kompatibile usually very not different. Preparation for construction. Last edited by Federmann; 31st October 2009 at 02:47 PM.

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30th October 2009, 06:34 PM	#11
Federmann diyAudio Member Join Date: Oct 2009	Characteristics of my drivers HQQF-55-502D, amplification without feedback. I set up to focus on flat transmission characteristics. Warning phase characteristics of the different scale

30th October 2009, 06:39 PM	#13
Federmann diyAudio Member Join Date: Oct 2009	Characteristics of drivers HQQF-55-502D feedback and intensifying 26dB, is worth noting a very small phase angle in the acoustic band, watch a different phase characteristic scale

30th October 2009, 06:52 PM	#15
Federmann diyAudio Member Join Date: Oct 2009	Input circuit drivers HQQF-55-502D is in no way exceptional, but the currents are unusually large, the result is: • Increased gain • Flat Specifications • Small Udif (differential voltage input) Stages Ufif

31st October 2009, 02:44 PM	#18
Federmann diyAudio Member Join Date: Oct 2009	Current form, the assessment and fitting end transistors. He will be measured.

31st October 2009, 07:08 PM	#19
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Oh, I see...at this point your PCB make fuse effect, trace is correctly wide - very clever... :-) Not wash yet ? And what are these disgusting spots on the left side ? Perspiratory relicts of intensive soldering ? :-)

31st October 2009, 09:20 PM	#20
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	I am not talking about lines commonly, but only about one - between Boucherot devices...there I see only c. 0,3 mm, which is little bit thick...but maybe after some drinks I will see something different like you... :-)

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