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Amp Furious VaBAnk  70W
Amp Furious VaBAnk  70W
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Old 20th June 2018, 04:55 PM   #1
Hennady Kovalsky is offline Hennady Kovalsky  Ukraine
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Default Amp Furious VaBAnk 70W

good afternoon,
introduce my amplifier see attachment
Uin max RMS 2.8V
Pmax 70W (4R)
Ku 15dB
K (TND) 0.01%

circuitry in the form of vintage, sounding very good, who are interested in asking questions, who sees errors in topology - write ...
On the forum I happen rarely, I apologize in advance for the slow answers.
with respect
HenK
Attached Images
File Type: jpg Фурия параллел .jpg (99.5 KB, 235 views)
File Type: jpg IMG_20180606_070413.jpg (369.8 KB, 223 views)
File Type: jpg IMG_20180606_204300.jpg (449.9 KB, 192 views)
File Type: jpg IMG_20180613_194255.jpg (152.4 KB, 187 views)
File Type: jpg IMG_20180613_202227.jpg (55.5 KB, 193 views)

Last edited by Hennady Kovalsky; 20th June 2018 at 06:23 PM.
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Old 20th June 2018, 07:07 PM   #2
prasi is offline prasi  India
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Amp Furious VaBAnk  70W
Thanks for posting your work. A fresh and different design. Congratulations!
regards
Prasi
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Old 20th June 2018, 07:51 PM   #3
Hennady Kovalsky is offline Hennady Kovalsky  Ukraine
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Thank you.
The scheme is sufficiently technological, it works immediately after switching on.
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Old 20th June 2018, 08:03 PM   #4
__BriKs__ is offline __BriKs__  France
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It looks like you sucessfull avoid ac input coupling cap, very interesting!
I'm trying to supress input cap in an amp design (single supply, input diff pair polarized about vcc/2) with jfet also, then your design is very interesting for me.

Regards,
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Old 20th June 2018, 09:30 PM   #5
thimios is offline thimios  Greece
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Quote:
Originally Posted by prasi View Post
Thanks for posting your work. A fresh and different design. Congratulations!
regards
Prasi
Ha Prasi ...new troubles on the road!
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Old 21st June 2018, 04:49 AM   #6
prasi is offline prasi  India
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Amp Furious VaBAnk  70W
, want to build this one as well?
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Old 21st June 2018, 05:33 AM   #7
Hennady Kovalsky is offline Hennady Kovalsky  Ukraine
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I will add frequency response and the spectrum of distortions on the first Watt
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File Type: jpg АЧХ FURY VABANK.jpg (195.5 KB, 70 views)
File Type: jpg IND FURY VABANK.jpg (155.2 KB, 65 views)
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Old 21st June 2018, 10:30 AM   #8
prasi is offline prasi  India
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Amp Furious VaBAnk  70W
Hello Hennady,
Could you kindly take a look at my drawing of your schematic and advise about
1. Grounding scheme
2. Resistor wattages of R9/R11. Except specifically mentioned wattages, I have used 0.5W package for resistors (10mm pitch).

regards
Prasi
Attached Images
File Type: png sch.png (15.3 KB, 58 views)
File Type: png packages.png (51.1 KB, 53 views)
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Old 21st June 2018, 04:10 PM   #9
Hennady Kovalsky is offline Hennady Kovalsky  Ukraine
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Quote:
Originally Posted by prasi View Post
Hello Hennady,
Could you kindly take a look at my drawing of your schematic and advise about
Hello Prasi.
Wow, good work. I have some tips:
1) the arrangement of the elements D2,R5,J4,Q6,J1 end D1,R4,J2,Q5,J3,R16 according must be the same on the Plate
2) Cap C1,C2 should be near
3) with the help of R5 half of the power is adjusted, it can be either a resistance of 91Ω or 110Ω ohms so it is desirable to make it out of two for example 75Ω and 25Ω ohms, for tuning or 75ohm constant and 50 ohm treemer.
Quote:
Originally Posted by prasi View Post
1. Grounding scheme
See attachment, I corrected.
Quote:
Originally Posted by prasi View Post
2. Resistor wattages of R9/R11. Except specifically mentioned wattages, I have used 0.5W package for resistors (10mm pitch).
regards
Prasi
ok, 0.5W normaly.
these resistors determine the initial current of the output transistors, the higher they are the higher the current the higher.

see attachment:
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File Type: png sch.png (38.2 KB, 45 views)
File Type: jpg ВАБАНК.JPG (483.6 KB, 47 views)
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Old 21st June 2018, 04:16 PM   #10
Hennady Kovalsky is offline Hennady Kovalsky  Ukraine
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D1 end D2 need to use Phillips 1.5W (BZV85C15)
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