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Old 21st September 2010, 05:11 PM   #991
AndrewT is online now AndrewT  Scotland
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Have you looked at the PCB layout?
What is located where those black mysteries reside?
A pair of To126 transistors.
Does that give you a clue rather than reading.
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Old 21st September 2010, 05:13 PM   #992
housing is offline housing  Hong Kong
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Quote:
Originally Posted by AndrewT View Post
Have you looked at the PCB layout?
What is located where those black mysteries reside?
A pair of To126 transistors.
Does that give you a clue rather than reading.
You better look at the picture more carefully. Are the 2SC3423's that huge?
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Old 21st September 2010, 05:13 PM   #993
zdr is offline zdr  Belgium
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Now, I have to ask a stoopid question: what is the purpose of heatshrinking together a LED and a single transistor?
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Old 21st September 2010, 05:15 PM   #994
AndrewT is online now AndrewT  Scotland
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is there anybody out there that reads the thread and what Roender has to tell us?
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Old 21st September 2010, 05:16 PM   #995
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by housing View Post
Are the 2SC3423's that huge?
look at the datasheet. It tells you that 2sc3423 are To126.
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Old 21st September 2010, 05:18 PM   #996
housing is offline housing  Hong Kong
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Originally Posted by AndrewT View Post
look at the datasheet. It tells you that 2sc3423 are To126.
I have partially populated PCBs, and you don't have to tell me that 2SC3423's are TO126. I'm using those that I bought in the 1990's.
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Old 21st September 2010, 05:23 PM   #997
zdr is offline zdr  Belgium
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Quote:
Originally Posted by housing View Post
No, I mean this black thing circled in red.
It does look like four transistors in a hug with heatsink.
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Old 21st September 2010, 05:30 PM   #998
housing is offline housing  Hong Kong
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Andrew,

Did I only read?
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Old 21st September 2010, 05:45 PM   #999
zdr is offline zdr  Belgium
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Quote:
Originally Posted by AndrewT View Post
is there anybody out there that reads the thread and what Roender has to tell us?
I did read it once few months back, but due to the noise posts like this, it's kinda difficult to trace back what you need
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Old 21st September 2010, 07:03 PM   #1000
Sheldon is offline Sheldon  United States
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Originally Posted by housing View Post
No, I mean this black thing circled in red.
Just there to thermally couple the transistors and the diode. It's a refinement more than a necessity, as they are touching anyway. The thermal time constants are fairly large compared to music signals, so they just keep bias drift lower. You can use heatshrink tubing there, as the total dissipation is low.

Sheldon
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