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PCB for the HAWK A18 amplifier (+ fets if required)
PCB for the HAWK A18 amplifier (+ fets if required)
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Old 21st May 2019, 08:04 PM   #1
Tarasque is offline Tarasque  Netherlands
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Default PCB for the HAWK A18 amplifier (+ fets if required)

I came across an old A18 amplifier with one defectice channel. After repairing the amp I found that the sound was open and transparent as well as the sound stage wide and in 3D.
As this was with my nearfields I use in the studio I wanted to go on a n adventure to use these for my Orion and designed a PCB so I can build 8 channels.
The beauty of these amp is a high quiescent current and about 30W output without feedback.
You can find the schematic idea on the web.

As I'm planning to build 8 channels and 2 reserve I could order some more if there is interest. The price would be around 7 euro's per channel for the PCB.
2mm FR4 and 2Oz copper.


Do not worry about the 2SJ162 and 2SK1058 as I have plenty NOS parts I only want to sell with the PCB's.
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Old 29th May 2019, 12:47 PM   #2
Tarasque is offline Tarasque  Netherlands
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Looks like there is not too much interest. Will order boards June 10.
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Old 29th May 2019, 03:20 PM   #3
jan.didden is offline jan.didden  Europe
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This often happens when you say 'the schematic is somewhere on the web'. Who has ever heard about Hawk?

If you want interest, post a schematic with parts numbers so people can see what they are getting into.

Jan
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Old 29th May 2019, 04:04 PM   #4
Tarasque is offline Tarasque  Netherlands
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Hi Jan,

You have a point. I have obtained the full design details of the designer and agreed not to disclose the component values.
This is the schematic
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File Type: gif a18a (1).gif (28.5 KB, 288 views)
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Old 29th May 2019, 04:40 PM   #5
ubergeeknz is offline ubergeeknz  New Zealand
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Quote:
Originally Posted by Tarasque View Post
about 30W output without feedback.
Forgive me if I'm wrong, but aren't R19/R20 providing global negative feedback via U3?
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Old 29th May 2019, 04:41 PM   #6
Tarasque is offline Tarasque  Netherlands
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Hi,

The opamp is a servo to keep the output at 0V
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Old 29th May 2019, 04:48 PM   #7
ubergeeknz is offline ubergeeknz  New Zealand
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Ah yes I see it. Thanks.
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Old 29th May 2019, 08:36 PM   #8
jan.didden is offline jan.didden  Europe
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So you offer boards for an amp with no parts lists? Really?

BTW Link delftaudio.com is dead.

Jan
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Old 29th May 2019, 09:49 PM   #9
Tarasque is offline Tarasque  Netherlands
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Partslist come with the boards
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Old 29th May 2019, 10:04 PM   #10
jacco vermeulen is offline jacco vermeulen  Netherlands
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Looks vastly different from the A15 from 1991 (apart from doubling the Lateral MOSFETS pair and the high-low bias switch)
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Last edited by jacco vermeulen; 29th May 2019 at 10:18 PM.
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