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VSSA Lateral MosFet Amplifier
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Old 6th January 2013, 03:40 PM   #281
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by pergo View Post
how better is THD with CCS? Reduced 3rd harmonic?
Didn't measure, but you can get quick impression by comparing these two.

Before and after.
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File Type: jpg VSSA_Square4_CCS.jpg (511.7 KB, 979 views)
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Old 6th January 2013, 03:59 PM   #282
Esperado is offline Esperado  France
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[QUOTE=Lazy Cat;3313485What do you think about loaded VSSA's squares response? [/QUOTE]Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.

Last edited by Esperado; 6th January 2013 at 04:02 PM.
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Old 6th January 2013, 04:18 PM   #283
Lazy Cat is offline Lazy Cat  Slovenia
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Esperado, images-links not working. Can you repeat-repair?
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Old 6th January 2013, 04:41 PM   #284
Esperado is offline Esperado  France
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Quote:
Originally Posted by Lazy Cat View Post
Esperado, images-links not working. Can you repeat-repair?
It is a forum's bug: nothing appears in the editor.
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Old 6th January 2013, 05:19 PM   #285
sonnya is offline sonnya  Denmark
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VSSA Lateral MosFet Amplifier
Quote:
Originally Posted by Lazy Cat View Post
Didn't measure, but you can get quick impression by comparing these two.

Before and after.
And the simplicity with CCS?? I could not resist to ask!
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Old 6th January 2013, 05:46 PM   #286
Lazy Cat is offline Lazy Cat  Slovenia
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The simplest CCS made: one j-fet and resistor. It is lowered from 10 mA, Vgs=0, to 2,4 mA, very small power dissipation, which means low tempco, very good stability and much better PSRR. OK but I have to admit that injection resistor is also performing very close.
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Old 6th January 2013, 07:09 PM   #287
Esperado is offline Esperado  France
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Quote:
Originally Posted by sonnya View Post
And the simplicity with CCS?? I could not resist to ask!
If performance and sound is improved by the add of 2 litle FETs and 2 resistances, not in the signal path, what do you chose ?
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Old 6th January 2013, 07:13 PM   #288
sonnya is offline sonnya  Denmark
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VSSA Lateral MosFet Amplifier
Quote:
Originally Posted by Esperado View Post
If performance and sound is improved by the add of 2 litle FETs and 2 resistances, not in the signal path, what do you chose ?
Agree. I only wrote so because if i have come up with an suggestion i got the message "It has to be simple.. Only 6 transistors, that is what it is going to be..."
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Old 6th January 2013, 07:34 PM   #289
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by sonnya View Post
Agree. I only wrote so because if i have come up with an suggestion i got the message "It has to be simple.. Only 6 transistors, that is what it is going to be..."
Resistors were there already, so two fets added only.

But it is possible to replace 15 k resistors with 1N5307 (2,4 mA CRD), so still six transistors VSSA hehehe.
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Last edited by Lazy Cat; 6th January 2013 at 07:38 PM.
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Old 6th January 2013, 08:05 PM   #290
Idefixes is offline Idefixes  France
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Quote:
Originally Posted by Lazy Cat View Post
Resistors were there already, so two fets added only.

But it is possible to replace 15 k resistors with 1N5307 (2,4 mA CRD), so still six transistors VSSA hehehe.
Seems quite hard to purchase....

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