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19th December 2012, 11:45 AM
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#8151 |
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diyAudio Member
Join Date: Mar 2009
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Here is the buffer...
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19th December 2012, 12:13 PM
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#8152 |
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diyAudio Member
Join Date: May 2005
Location: Denmark
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I like the buffer...... wonder what input impedance is... could have influence on the RiAA circuit.
We can mirror in the current for the input . This way we have a good injection possibility for the servo |
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19th December 2012, 12:33 PM
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#8153 |
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diyAudio Member
Join Date: Mar 2009
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That depends on how high the idle current is in the input stage. Other then that the input BJTs are bootstrapped on CCSs so input impedance should be high.
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19th December 2012, 12:34 PM
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#8154 |
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diyAudio Member
Join Date: Mar 2009
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Yes, of cause the CCSs on the input trannies can be a mirror.
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19th December 2012, 12:36 PM
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#8155 |
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diyAudio Member
Join Date: May 2005
Location: Denmark
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Ok... I'll draw something up....
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19th December 2012, 12:36 PM
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#8156 |
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diyAudio Member
Join Date: Mar 2009
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fine
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19th December 2012, 05:26 PM
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#8157 | |
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diyAudio Member
Join Date: Feb 2009
Location: Both feet on the ground (near Gouda)
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Quote:
 just exercising some idea's
__________________
Signature Transresistance Current-Feedback BIGBT Amplifier; Push -->>{{ }}<<-- there.
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19th December 2012, 05:39 PM
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#8158 |
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diyAudio Member
Join Date: Nov 2007
Location: Knifetown-Germoney
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Hi Frans,
Thd looks nice ! Btw, what are you guys trying to invent now ? |
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19th December 2012, 07:28 PM
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#8159 |
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diyAudio Member
Join Date: Mar 2009
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A one stage phono that is also a power amp.
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19th December 2012, 08:47 PM
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#8160 |
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diyAudio Member
Join Date: Mar 2009
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For example high power output transistors could be added this way....
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