Clone Goldmund Amplifier

[hien.t.nguyen]

I like Goldmund Amplifier

I done clone this amplifier

 

[hien.t.nguyen]

Continius

 

[bazouka]

Waw !!
What about the sound ?
I'm not jealous ;-)
What was the full cost of the project, and do you think of providing DIY Kits for us someday ??

 

[hien.t.nguyen]

Waw !!
What about the sound ?
I'm not jealous ;-)
What was the full cost of the project, and do you think of providing DIY Kits for us someday ??

Hi bazouka

I try to use components on the circuit is the best.
The price of this amplifier is not very high

I can not buy MOSFET Goldmund 10N20 and 10P20, but instead I found with 2SK2221 and 2SJ352
Power diode: I use STTH6002, it differs Goldmund
Opam:I used AD 811,AD797,AD706J-SMD,AD586JN,OPA134,OPA2134,...
BJT: 2N5551,2N5565,FZT857,FZT957,...
Capacitor: Philips BC, Vishay BC,Wima,...
Resistor: Dale, SMD-MF(Panasonic).
Mosfet 8 pcs/1 chanel
Power transformer: 1000W
....

😀

 

[hien.t.nguyen]

Schematic
....

 

[AndrewT]

Do q17 & q20 still work?
Why so many opamps?

 

[hien.t.nguyen]

Do q17 & q20 still work?
Why so many opamps?

Q17,Q20, regular of VAS + driver1
Many opam for protect amplifier

😀

 

[tommy1000]

What power diode does Goldmund use?

 

[hien.t.nguyen]

What power diode does Goldmund use?

Goldmund Telos 5000 used power diode is STTH6102TV

I used STTH6002

 

[tommy1000]

Thank you.

Can you post pictures of inside Telos 5000 and circuit diagram/schematic?

 

[hien.t.nguyen]

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]

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]

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]

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

Thank you, pm sent.

 

[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.

 

[hien.t.nguyen]

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]

These are the components I've used for assembly

 

[Benedetto]

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]

Looks like a Telos 250, but prettier.
Nice job.

 

[tommy1000]

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?