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Old 26th May 2013, 12:55 AM   #1011
Stefanoo is offline Stefanoo  Italy
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Joachim...I am going to start entering into layout.
Would you like to quick review the schematic for the main board to see if I missed anything?
Just a mini review 2 sets of eyes is better than one
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Old 26th May 2013, 01:13 AM   #1012
buzzforb is offline buzzforb  United States
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stefanoo,
Did you spend any time testing BCP53/56 for ideal operating conditions? I will be using them in a preamp soon, as they seem like very nice complimentary pairs.
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Old 26th May 2013, 01:16 AM   #1013
Stefanoo is offline Stefanoo  Italy
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I think they sound pretty good and I keep using them in my implementation.
For me it's one of the most pleasing/more neutral sounding medium power BJT I have tried so dfar.
The sound pretty good at about 10-15mA.
I wouldn't use them as input devices though.
Very good for cascoding or as current mirrors such as in this applucation.
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Old 26th May 2013, 01:21 AM   #1014
buzzforb is offline buzzforb  United States
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I was thinking cascode, leaving the CM dities up to zvn/p 4424gta
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Old 26th May 2013, 01:30 AM   #1015
Stefanoo is offline Stefanoo  Italy
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It seems to be a good choice.
I also encourage you to try BCP for CM like I do here.
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Old 26th May 2013, 01:37 AM   #1016
buzzforb is offline buzzforb  United States
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Will do, although the zvp will have a little more grunt. Gonna try CM and folded cascode output.
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Old 26th May 2013, 02:14 AM   #1017
Stefanoo is offline Stefanoo  Italy
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yes ZVP is a very good powerful part. BCP is got less byte than that one but it is a bit more neutral.
If you get to compare them direcly I would be interested to know your opinion.
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Old 26th May 2013, 03:05 AM   #1018
Joachim Gerhard is offline Joachim Gerhard  Germany
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Schematic looks good but where is the servo ?
I think you left it out because there is also no buffer.
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Old 26th May 2013, 03:08 AM   #1019
Stefanoo is offline Stefanoo  Italy
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Quote:
Originally Posted by Joachim Gerhard View Post
Schematic looks good but where is the servo ?
I think you left it out because there is also no buffer.
Yes servo is on a little separate board as well for testing purpose.
However at the end the PSU and servo will be pluggable modules on the final product.
It will be built dual mono with batteries and control circuitry for the battery on one chassis....but control for the battery will come later...
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Old 26th May 2013, 03:21 AM   #1020
Stefanoo is offline Stefanoo  Italy
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BTW just out of curiosity....who rated this post with a lame one star??

Can we start giving a good rate to this thread?! Ahahahahaha...
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