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Old 14th March 2011, 12:55 AM   #11
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Quote:
Originally Posted by tommy1000 View Post
Thank you.

Can you post pictures of inside Telos 5000 and circuit diagram/schematic?
Sorry,I can't.

It is not my. It is Goldmund's
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Old 14th March 2011, 12:49 PM   #12
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I understand.

I have an other question. In your own schematic of the input stage what is the function of the components I have put circles around and what type/valu do they have?
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Old 14th March 2011, 01:34 PM   #13
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Quote:
Originally Posted by tommy1000 View Post
I understand.

I have an other question. In your own schematic of the input stage what is the function of the components I have put circles around and what type/valu do they have?
You can sent a pm for me,if you want.
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Old 14th March 2011, 02:29 PM   #14
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Quote:
Originally Posted by hien.t.nguyen View Post
You can sent a pm for me,if you want.
Thank you, pm sent.
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Old 14th March 2011, 06:15 PM   #15
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the opamp replaces the second transistor of a two transistor CCS.
The chip before the opamp is monitoring other signals and using those to control the output of the opamp.
The chip could be monitoring,
start up,
output offset,
internal temperature,
heatsink temperature,
input offset,
oscillation,
excessive current,
loss of AC power, etc.

If any of these showed as a potential failure mode the opamp would starve the CCS and effectively switch OFF the input pair.
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Old 14th March 2011, 06:34 PM   #16
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Quote:
Originally Posted by AndrewT View Post
the opamp replaces the second transistor of a two transistor CCS.
The chip before the opamp is monitoring other signals and using those to control the output of the opamp.
The chip could be monitoring,
start up,
output offset,
internal temperature,
heatsink temperature,
input offset,
oscillation,
excessive current,
loss of AC power, etc.

If any of these showed as a potential failure mode the opamp would starve the CCS and effectively switch OFF the input pair.
CCS of Goldmund Telos 5000: ADR455BRZ + OPA134UA + 2N5551(x2 pcs)
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Old 14th March 2011, 06:49 PM   #17
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These are the components I've used for assembly
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File Type: jpg lk.JPG (127.3 KB, 1908 views)
File Type: jpg 1.jpg (150.3 KB, 1803 views)
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Old 14th March 2011, 07:14 PM   #18
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Hi hien,
is there a slight chance to get some Boards, BOM etc ?
Is this thingie finished yet ?
Btw: nice job done,
how does it sound like ?
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Old 14th March 2011, 07:59 PM   #19
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Looks like a Telos 250, but prettier.
Nice job.
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Old 14th March 2011, 08:41 PM   #20
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Thank you for the explanations!

I agree it looks similar to Telos 250. Why did you not use the cascoded output stage from the Telos 5000, it suppose to produce less distortion?
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