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Old 19th June 2013, 06:58 PM   #4651
generg is offline generg  Germany
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My wife has given up smacking me...no good sign!

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Old 19th June 2013, 07:01 PM   #4652
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Quote:
Originally Posted by lhquam View Post
I am sure it will sound different, but:
  • The resistors from the source of the output FETs to the gates of the JFETs create global negative feedback.
  • The all of the feedback currents will be sensitive to the rail voltages thus degrade the PSRR.
Thanks lhquam for your analyses. Will this global NF lower output impedance like that in diyF5?
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Old 19th June 2013, 07:47 PM   #4653
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Old 19th June 2013, 08:58 PM   #4654
lhquam is offline lhquam  United States
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Quote:
Originally Posted by Antoinel View Post
Thanks lhquam for your analyses. Will this global NF lower output impedance like that in diyF5?
I would think so. You should run a simulation and see.
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Old 19th June 2013, 09:05 PM   #4655
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Originally Posted by lhquam View Post
I would think so. You should run a simulation and see.
Thanks lhquam.
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Old 20th June 2013, 03:39 AM   #4656
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Quote:
Originally Posted by lhquam View Post
The all of the feedback currents will be sensitive to the rail voltages thus degrade the PSRR.
Yes, I think a regulated supply might come in handy.

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Old 20th June 2013, 11:54 AM   #4657
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Yes, I think a regulated supply might come in handy.

An added complexity which is absent in diyF5.
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Old 21st June 2013, 02:26 AM   #4658
lhquam is offline lhquam  United States
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I received my F6CC Teaser boards and parts. Here is a picture of the build so far. Obviously the MOSFETs have not been yet attached with mica and grease. I am about ready for a smoke test.

This is a bench-test setup where the MOSFETs are attached using MOLEX connectors and elevated by a 1/4" aluminum plate which is attached to the heatsink with thermal grease and screws. This makes it easy to experiment with different MOSFETs be unscrewing them and readjusting the bias voltages. Also, using hex standoffs for power and output connections makes board removal easy in order to make component changes.
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File Type: jpg F6CC-build1-1.jpg (108.6 KB, 286 views)

Last edited by lhquam; 21st June 2013 at 02:32 AM.
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Old 21st June 2013, 09:15 AM   #4659
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Looking good. Did you ever have any luck with dropping Rs. Using this technique. If so, I may try it with preamp I am playing with..
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Old 21st June 2013, 09:20 AM   #4660
generg is offline generg  Germany
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a clever solution to change the components....!
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