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Old 8th May 2010, 02:24 AM   #1
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Default Pioneer Japanese Schematic

Hi, I found this on the web.

A Pioneer Non Feedback Amplifier, I upload the block schematic.

From whats amplifier is this Diagram?
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File Type: jpg pioneer_nonfb.jpg (11.8 KB, 549 views)
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Old 8th May 2010, 02:37 AM   #2
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What are the mystery black boxen? 3way current mirror???

It would make sense both emitters of the diamond buffer
to operate at same current? And then also couple this same
current into the output... But thats just me thinking, I am no
translator. The middle leg would be the master and the other
two the copies...

I suspect the other black boxen are +4 and -4V regulators,
with a feature to be disabled (open circuit) to shut down
the entire amplifier.
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Old 8th May 2010, 02:47 AM   #3
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Quote:
Originally Posted by kenpeter View Post
What are the mystery black boxen? 3way current mirror???
Not a mystery, just I want to know from what amplifier is this schematics.
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Old 8th May 2010, 08:36 AM   #4
Nrik is offline Nrik  Denmark
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Where did you find it? If it's in japaneese you could google-translate is wich usually gives an understandable english from japaneese.

Anyway - i studied quite some Pioneer schematics during the years, and with input fets I would think we are in the high-end category. It could one from the "Exclusive" series, or the integrated A09, A07.

Two links to get you closer:
TVK °7 : Pioneer
HiFi Engine | Download Free User/ Service Manuals, Amplifier, Receiver, CD, Tape, Tuner, Video (requires login, but its free and there are many schematics)
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Old 8th May 2010, 06:48 PM   #5
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Nrik, thanks for the links.
Very interesting
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Old 8th May 2010, 07:15 PM   #6
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Some Information
"http://www.geocities.jp/bluegourdscastle/audio/amp-011.html"
Above site have the current mirror circuit informaton (fig).

And more explanation (fig) of the current mirror circuit is bellow
"http://www.geocities.jp/mason_ishiatama/kaiseki/kaiseki1/Kaiseki1-5.htm"

Regards.
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Old 8th May 2010, 07:21 PM   #7
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The circuit is of Pioneer CZ-1(a). The mysterious boxes are covered here:
Low-distortion Super-pair Buffer simulation schematics
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Old 9th May 2010, 07:11 AM   #8
jony is offline jony  Poland
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Very similar schematics you can find in Pioneer M5
And this type of topology is called Super Linear Circuit

the Headphone amplifier
AES E-Library: Super Linear Circuit by Ozawa, Okio; Ishikawa, Kikuo
Pioneer M5
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Old 10th May 2010, 07:57 AM   #9
SkyChu is offline SkyChu  Taiwan
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The Pioneer Exclusive M5 service maunal:

Pioneer M5 Exclusive Service Manual free download,schematics,datasheets,eeprom bins,pcb,repair info for test equipment and electronics
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Last edited by SkyChu; 10th May 2010 at 08:06 AM.
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Old 14th May 2010, 01:33 AM   #10
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Somebody build an amplifier with SLC topology? Experiences?

A few months ago I build an Andrea´s amplifier for low power amp (<20W) with very good results but no measures.
the Headphone amplifier
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