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so.. i received this in the mail today .
so.. i received this in the mail today .
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Old 7th October 2017, 11:03 PM   #1
Aatto is offline Aatto  United States
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Join Date: Feb 2017
Location: Austin
Default so.. i received this in the mail today .

a few weeks back I came across this on aliexpress, i know it's Chinese board with no schematics and good luck to find and fix all the bugs and everything but i thought it's only 7 bux, what can go wrong ? lol , i had good experience with this seller and so i ordered one and received it today !
it was bigger than i thought 7" x 6-3/4" , and it's way more complex than i expected. has 40+ transistors 3x tl081.
any how, just wanted to share this here and report it as i go, let me know if you guys can figure anything out of this :
GZLOZONE HV-5-TB Headphone amplifier PCB

so.. i received this in the mail today .-img_2201-jpg

so.. i received this in the mail today .-img_2202-jpg

so.. i received this in the mail today .-thumbnail-16-jpg

so.. i received this in the mail today .-thumbnail-17-jpg

Cheers
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File Type: jpg IMG_2201.jpg (1,000.7 KB, 342 views)
File Type: jpg IMG_2202.jpg (835.3 KB, 323 views)
File Type: jpg thumbnail (16).jpg (236.2 KB, 317 views)
File Type: jpg thumbnail (17).jpg (208.1 KB, 318 views)
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Old 7th October 2017, 11:43 PM   #2
CharlieLaub is offline CharlieLaub  United States
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Location: California
so.. i received this in the mail today .
I suggest a first step would be for you to trace out a schematic and then come back and post it here when you are done.
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Old 18th October 2017, 01:14 AM   #3
Aatto is offline Aatto  United States
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Join Date: Feb 2017
Location: Austin
Default schematic !

i asked the seller for schematic and they sent it to me ! such nice people.
what do you think ?
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File Type: pdf HV5-TB-SCH.pdf (68.4 KB, 132 views)
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Old 19th October 2017, 07:44 PM   #4
proid is offline proid
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This is a clone board of the EHHA by Cavalli
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Old 19th October 2017, 11:38 PM   #5
Aatto is offline Aatto  United States
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Join Date: Feb 2017
Location: Austin
huh, nice, good catch , i heard it's an incredible amp.
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