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Old 20th March 2007, 05:36 AM   #1
Tyimo is offline Tyimo  Hungary
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Default X0 preamp question

Hi!

I have a question about the X0 circuit.
I attached the X0's inside picture. There is a section (marked with red line) what is not included in the sevicemanual's schematic but it is on the parts layout!
It has one 2sk389, one IRF9610, one 3.32K-5W resistor, one 100uF25V cap and a dozen of small resistors.
Could somebody tell me what is the function of that part of the circuit?

Thanks and greets:

Tyimo
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Old 22nd March 2007, 04:40 AM   #2
Tyimo is offline Tyimo  Hungary
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Nobody??
Mr. Pass??
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Old 23rd March 2007, 07:47 PM   #3
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From the description it maybe SE (a single ended output stage.)

Normally you would use the balanced outputs but the SE stage allows SE connection to your power amps.

If you go to passlabs.com diy pages there is a great article on discrete opamps.
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Old 24th March 2007, 08:53 AM   #4
rsbay is offline rsbay  Germany
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It is a balanced to single ended stage build with a discrete operational amplifier with a single ended class a output stage.

Regards

Ralph
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Old 24th March 2007, 12:00 PM   #5
Tyimo is offline Tyimo  Hungary
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Thanks Macka and Ralph!

I thought it is easyer way to make Balanced to SE like in the BOSOZ....
Is this Opamp something like in the Opamp article?

Greets:

Tyimo
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Old 25th March 2007, 08:32 AM   #6
rsbay is offline rsbay  Germany
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I think the discrete opamp consist of an input stage with a 2SK389 and a current source. The output driver is single ended build with a IRF9610.

Ralph
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