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Graham Slee View Drop Down
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Joined: 11 Jan 2008
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Points: 16314 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 01 Dec 2009 at 1:11am
Originally posted by mrarroyo mrarroyo wrote:

Sorry about that, I have removed the pictures. I will post lower resolution ones next time. Embarrassed


It seems a shame to remove them fully - perhaps shrink them a bit? Or monochrome them?
That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps
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Points: 1401 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mrarroyo Quote  Post ReplyReply Direct Link To This Post Posted: 03 Dec 2009 at 2:04am
I have resized the image!
 
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Points: 24 		Post Options Post Options   Thanks (0) Thanks(0)   Quote RobW Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jan 2010 at 5:23am
Hmmm ... that circuit looks oddly familiar
I'm curious about something. There are a couple of unlabeled circuit points (holes in the board with corresponding termination points on the bottom side) right above each of the thermally couple transistor pairs. What are/were these intended for?
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Points: 16314 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jan 2010 at 8:49am
On the "rev 1" PCB they were used for a stabilization capacitor in the current source, but I didn't like that solution - it seemed untidy, a bit of a cheat from an engineering point of view. Stabilization is used in all amplifier circuits to prevent oscillation. The "rev 2" PCB uses a different regime. Stabilization is a topic I will cover to a degree in the mag. The Art of Electronics goes into quite a bit of detail on this subject, and tons more of detail is available from other sources - I have several hundred pages on this very important (for audio) subject. 
That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps
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