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Old 19th December 2012, 12:45 PM   #8151
Joachim Gerhard is offline Joachim Gerhard  Germany
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Here is the buffer...
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Old 19th December 2012, 01:13 PM   #8152
MiiB is offline MiiB  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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Old 19th December 2012, 01:33 PM   #8153
Joachim Gerhard is offline Joachim Gerhard  Germany
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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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Old 19th December 2012, 01:34 PM   #8154
Joachim Gerhard is offline Joachim Gerhard  Germany
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Yes, of cause the CCSs on the input trannies can be a mirror.
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Old 19th December 2012, 01:36 PM   #8155
MiiB is offline MiiB  Denmark
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Ok... I'll draw something up....
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Old 19th December 2012, 01:36 PM   #8156
Joachim Gerhard is offline Joachim Gerhard  Germany
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fine
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Old 19th December 2012, 06:26 PM   #8157
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
Here is the buffer...
Something like this just exercising some idea's
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Old 19th December 2012, 06:39 PM   #8158
Benedetto is offline Benedetto  Germany
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Hi Frans,
Thd looks nice !
Btw,
what are you guys trying to invent now ?
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Old 19th December 2012, 08:28 PM   #8159
Joachim Gerhard is offline Joachim Gerhard  Germany
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A one stage phono that is also a power amp.
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Old 19th December 2012, 09:47 PM   #8160
Joachim Gerhard is offline Joachim Gerhard  Germany
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For example high power output transistors could be added this way....
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