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Old 7th February 2013, 02:39 AM   #111
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Quote:
Originally Posted by oiphy View Post
hello.
I'm building telos. and wonder what value the inductor 18 t 1,5 cm?
value in mH? maybe I use foil inductor...
Hi!

Please do not say Gm or telos, it is not good for us, That's the rules of the forum.This is 637 amplifier.Thanks and best regards.

And please see it:
wrap 15 round, diameter: 1.5cm to 2cm
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Old 10th April 2013, 10:41 AM   #112
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after I copy Goldmun Telos 2500 Amplifier, I was successful and not only that, on the basis of development, diy, and little understanding, learning and experience inherited their predecessors,
Quanghao also to design an amplifier with circuit diagram here. Please see

Thanks all
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Old 11th April 2013, 03:38 AM   #113
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Default Layout of HQ-Amplifier

and here is the layout of the HQ-Amplifier, and parameters measured frequency response measurements using Tektronix AM 700, invite you to see, thank you very much!
quanghao
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Old 11th April 2013, 03:52 AM   #114
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Hi Quanghao,

I'm really interested in that amp PCB but would like you to do them in thicker

Board thickness = 2mm, Copper thickness = 70um and possibly gold plating on solder pads

The previous PCBs were too thin for my taste. I don't mind paying a little extra for better PCB.

Thanks
Do
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Old 11th April 2013, 03:59 AM   #115
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[QUOTE=pinnocchio;3449443]Hi Quanghao,

I'm really interested in that amp PCB but would like you to do them in thicker

Board thickness = 2mm, Copper thickness = 70um
yes 2mm

and possibly gold plating on solder pads

i can not do that,
Thanks
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Old 11th April 2013, 04:02 AM   #116
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[QUOTE=quanghao;3449451]
Quote:
Originally Posted by pinnocchio View Post
Hi Quanghao,

I'm really interested in that amp PCB but would like you to do them in thicker

Board thickness = 2mm, Copper thickness = 70um
yes 2mm

and possibly gold plating on solder pads

i can not do that,
Thanks
Why not? Is it a cost issue or your PCB provider does not do it?

What about 70um copper thickness?

Thanks
Do
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Old 11th April 2013, 04:03 AM   #117
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[QUOTE=pinnocchio;3449454]

Why not? Is it a cost issue or your PCB provider does not do it?

What about 70um copper thickness?
It is may be!

Thanks
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Old 11th April 2013, 04:05 AM   #118
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[QUOTE=quanghao;3449459]
Quote:
Originally Posted by pinnocchio View Post

Why not? Is it a cost issue or your PCB provider does not do it?

What about 70um copper thickness?
It is may be!

Thanks
OK, I'm interested, please let us know the price per PCB.

Thanks
Do
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Old 11th April 2013, 04:08 AM   #119
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In this Amplifier you can use some Jfet N in put EX: 2sk170, 2sk30
or use LM394 in put!

thanks
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Old 11th April 2013, 05:43 AM   #120
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The feedback connection to D3 and D4 makes the stability under clipping very complex and conditional. I can't predict what will set it off but it seems dangerous.

Also, if the Cj of the zeners is significant compared to the 4148's, then you will probably have charge pumping through the 4148's causing some strange dynamic frequency-dependent distortion. Whether this is is perceived as distortion or as some "special sound quality" is another matter. If you flip the D+Z around, it'll be the 4148 that's reverse-biased rather than the Zener, so its small capacitance will be more guaranteed and charge-pumping reduced. The original Goldmund actually does this IIRC, and although it doesn't look right it still works. If you choose to switch the protection back to the output I suggest to put 2 diodes in series with R19 so it's value can be decreased - because with the Goldmund protection scheme the gate voltage at clipping is Vz+Vd+(Ivasmax*R19).
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