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Old 26th March 2013, 09:28 PM   #531
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Stefanoo View Post
I am attaching the model. It looks like I can't get a solid result.
Could anybody here look at it and make sure I am not making any gross mistake?
Done
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File Type: png Balanced Paradise Input Output Offset Nulling by FdW Compleat.PNG (80.2 KB, 98 views)
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File Type: asc FULL Balance BJTs.asc (20.7 KB, 8 views)
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Old 26th March 2013, 09:34 PM   #532
Stefanoo is offline Stefanoo  Italy
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Originally Posted by FdW View Post
Done
great! Do you guys feel confident and you want me to sztart prototyping this?
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Old 26th March 2013, 09:36 PM   #533
Joachim Gerhard is offline Joachim Gerhard  Germany
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Old 26th March 2013, 09:38 PM   #534
MiiB is offline MiiB  Denmark
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Stefanoo do you feel confident..??
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Old 26th March 2013, 09:41 PM   #535
Stefanoo is offline Stefanoo  Italy
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just a question:

on the servo that feeds the input, isn't this going to affect loading on the cartridge?


Let's say, ideal loading on the cartridge is 100ohm, then each side should have 200ohm.
Now with the resistor in series aren't we creating asymmetric condition for the cartridge to work off from?
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Old 26th March 2013, 09:42 PM   #536
Stefanoo is offline Stefanoo  Italy
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Originally Posted by MiiB View Post
Stefanoo do you feel confident..??
I actually do really like this I am just wondering if we would like to work on the current mirrors and output buffer eventually.
I feel like ouput stage could be selected better.

I will do some listening tests with the Kelvin's buffer and see if it sounds any better than the simple one and eventually include it on the common schematic.
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Old 26th March 2013, 09:43 PM   #537
FdW is offline FdW  Netherlands
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Old 26th March 2013, 09:46 PM   #538
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Stefanoo View Post
just a question:

on the servo that feeds the input, isn't this going to affect loading on the cartridge?


Let's say, ideal loading on the cartridge is 100ohm, then each side should have 200ohm.
Now with the resistor in series aren't we creating asymmetric condition for the cartridge to work off from?
There is 100 Ohm both sides, as that was in your original drawing, there is no problem if you halve the resistor values (3 x 50 and 2 x 100 Ohm) the servo will still work, and the servo output filter will go from 1.5 to 3 Hz (and that is fine too).
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Old 26th March 2013, 09:58 PM   #539
FdW is offline FdW  Netherlands
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But why not leave the 200 Ohm 'standard' loading, and add a resistor of 200 Ohm in parallel to the cartridge to get 100 Ohm loading, by providing a place to add this loading resistor it is easy to change to loading by changing just one resistor, and you can go from 200 Ohm to (almost) zero (we must allow for trace and wiring resistance).
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Old 26th March 2013, 09:59 PM   #540
jacco vermeulen is offline jacco vermeulen  Netherlands
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Think I need pants with flared legs for that one, polyester and in ugly brown with thin white stripes.
Ooh, and lacquered ankle boots with a zipper.

http://www.youtube.com/watch?v=kzw1_2b-I7A

Last edited by jacco vermeulen; 26th March 2013 at 10:02 PM.
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