Clone Goldmund Amplifier - Page 2

hien.t.nguyen · 14th March 2011, 12:55 AM

Quote:

Originally Posted by tommy1000

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

tommy1000 · 14th March 2011, 12:49 PM

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?

hien.t.nguyen · 14th March 2011, 01:34 PM

Quote:

Originally Posted by tommy1000

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.

tommy1000 · 14th March 2011, 02:29 PM

Quote:

Originally Posted by hien.t.nguyen

You can sent a pm for me,if you want.

Thank you, pm sent.

AndrewT · 14th March 2011, 06:15 PM

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.

hien.t.nguyen · 14th March 2011, 06:34 PM

Quote:

Originally Posted by AndrewT

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)

hien.t.nguyen · 14th March 2011, 06:49 PM

These are the components I've used for assembly

Benedetto · 14th March 2011, 07:14 PM

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 ?

jacco vermeulen · 14th March 2011, 07:59 PM

Looks like a Telos 250, but prettier.

Nice job.

tommy1000 · 14th March 2011, 08:41 PM

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?

14th March 2011, 07:59 PM	#19
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	Looks like a Telos 250, but prettier. Nice job. __________________ Not so much,.......if it says "ZM" in the corner.

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14th March 2011, 06:15 PM	#15
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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.

14th March 2011, 07:14 PM	#18
Benedetto diyAudio Member Join Date: Nov 2007 Location: Knifetown-Germoney	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 ?

14th March 2011, 08:41 PM	#20
tommy1000 diyAudio Member Join Date: Mar 2008	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?