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#741 | |
diyAudio Member
Join Date: Apr 2006
Location: italia - ora USA -WI
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Quote:
Let me correct it then!
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Stefano |
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#742 |
diyAudio Member
Join Date: Apr 2006
Location: italia - ora USA -WI
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I was thinking why it was working on my prototype with the servo before the buffer.
Here is the updated schematic, this should work just fine. Thanks for the input.
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Stefano |
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#743 | |
diyAudio Member
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Quote:
![]() Last edited by FdW; 23rd April 2013 at 09:08 PM. |
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#744 | |
diyAudio Member
Join Date: Apr 2006
Location: italia - ora USA -WI
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Quote:
Servo will push 0V at the gate, Source of the Jfet will go roughly down to -0.2V and then other side of the resuistor will cancel the offset restoring it to 0V. Can you tell me where this reasoning fails?? ![]() EDIT: I have the prototype running that way and output offset is about 1mV!
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Stefano Last edited by Stefanoo; 23rd April 2013 at 09:20 PM. |
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#745 |
diyAudio Member
Join Date: Mar 2009
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I would include the Calvin buffer on the test PCB.
The InterFet type can then be build external. However good the InterFet sounds i think that the Calvin buffer has better technical data. The InterFets could also being used in a Calvin arrangement. |
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#746 | |
diyAudio Member
Join Date: Apr 2006
Location: italia - ora USA -WI
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Quote:
It is easier to build that buffer vs Calvin so having it on a PCB will help development. Good point! True instead of the K389 we can use the IF3602 since it proved to have a superior sound.
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Stefano |
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#747 |
diyAudio Member
Join Date: Mar 2009
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Yes, we can try that.
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#748 |
diyAudio Member
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It (probably) fails nowhere, but connecting to the low impedance output will be better than to the high impedance input, also it will remove the 1mV, and there is no chance that component tolerances, input voltage differences (vgs), aging, temp, and more factors will ever result in (any form of) output offset.
Last edited by FdW; 23rd April 2013 at 09:52 PM. |
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#749 | |
diyAudio Member
Join Date: Apr 2006
Location: italia - ora USA -WI
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Quote:
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Stefano |
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#750 |
diyAudio Member
Join Date: Apr 2006
Location: italia - ora USA -WI
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ok sounds good. I will update the schematic with Calvin buffer using IF3602 on driver.
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Stefano |
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