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Old 22nd February 2006, 08:47 PM   #1
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Post GM120 diy amp

Hi
I found very interesting and professionaly done diy GM120 amplifier .
What do you think about topology of this one ?

Unfortunately there is no PCB layout - maybe someone could make new PCB for that amp ?


Warning ! Forum is in chinesse...

link for GM120

Very sorry for poor english )
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File Type: gif gm120sch.gif (32.7 KB, 1034 views)
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Old 22nd February 2006, 11:03 PM   #2
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link to the schematic of GM120:

http://www.diyzone.net/images2/GM0203SCH-1.pdf

and parts list:

http://www.diyzone.net/images2/GM0129BOM.XLS
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Old 22nd February 2006, 11:49 PM   #3
ilimzn is offline ilimzn  Croatia
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The FET input LTP should REALLY be cascoded to it's tail... otherwise, it's remarkably similar to many amps from the late 70s, (that should actually be a compliment ) except for the MOSFET output
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Old 23rd February 2006, 04:19 AM   #4
SY is offline SY  United States
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The source of this schematic, if indeed it IS their schematic, is a company notorious for ripping off the designs, hard work, and creativity of others. Speaking as a member of this community, not on any official basis, I would encourage people NOT to visit that site or even consider spending a penny of money with them.
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Old 23rd February 2006, 04:36 AM   #5
lineup is offline lineup  Sweden
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Quote:
Originally posted by SY
The source of this schematic, if indeed it IS their schematic,
is a company notorious for ripping off the designs, hard work, and creativity of others.
Speaking as a member of this community, not on any official basis,
I would encourage people NOT to visit that site
or even consider spending a penny of money with them.
What company ??
And I promise I will not spend a penny!

With 'website', do you mean diyzone.net ??
If it is,
then is easy to avoid visiting links going there.
Besides, is too confusing with pages having "??????????" all over.
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Old 23rd February 2006, 04:40 AM   #6
SY is offline SY  United States
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Yes.
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Old 23rd February 2006, 04:45 AM   #7
mtlin12 is offline mtlin12  Taiwan
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Click the image to open in full size.

DIYZONE ( a Taiwan DIY kits supplier) has sold out all GM120 kits.

Click the image to open in full size.

DZ's PCB layout is quite interesting, like this a piggy-bag DC-servo.

If you can read Chinese, more pictures in here:
http://www.diyzone.net/article.php?sid=674
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Old 23rd February 2006, 07:16 AM   #8
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So, how much is it ? Full or not soldered kit I mean. Is there possible to buy only PCB ?

Sorry I don't speak chinesse.
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Old 23rd February 2006, 07:45 AM   #9
mtlin12 is offline mtlin12  Taiwan
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Quote:
Originally posted by bodopriva
So, how much is it ? Full or not soldered kit I mean. Is there possible to buy only PCB ?

Sorry I don't speak chinesse.
Full kit with case at NT9,999, it was about US$300.

But I think they will not sell bare PCBs, maybe you can ask their
boss Mr. Wu . limin_wu@diyzone.net
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Old 23rd February 2006, 10:53 AM   #10
SY is offline SY  United States
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Whom do you think THIS design is stolen from?
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