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Old 4th November 2011, 10:10 PM   #3051
RCruz is offline RCruz  Switzerland
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Do you mean the Buffalo Bill is a buffer... no gain... What is the gain of the power amp that you are using ?

I wonder how CCS might modify your positive first impressions related with this last build.

IMO a good psu with the simplest amp is much better than a complex amp with very good PSRR, powered by an average PSU.

PS:
I too suffer from spectacles disease so I understand perfectly what you mean
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Last edited by RCruz; 4th November 2011 at 10:14 PM.
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Old 4th November 2011, 10:48 PM   #3052
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As i said, the Buffalo Bill is a buffer but that has an elaboration of the circuit here as voltage gain before the volume control when needed.
When the eyes get worse the ears get better i hope (:
Here is how i developed the circuit further. It has now the CCS`s and the Hawksford cascode is clamped with Leds for more stability. Also shown is a Fet version that represents a considerable simplification if you have P-Channels. C1, C2 values come right out of my head. They have to be adjusted for best time ( squarewave ) response.
What can be improved over this ? Cacoding the input too comes to mind but on the other hand the gain of the input stage is very low so not much can be won at the cost of complication. I think i like it as is.
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Old 4th November 2011, 10:56 PM   #3053
RCruz is offline RCruz  Switzerland
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I particularly like the fet version.

PS:
I agree that the ears get much better when you loose a small fraction of your vision. That is why I do not mind anymore... I can hear really good nowadays.
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Old 4th November 2011, 11:01 PM   #3054
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I can even see very good with the right spectacles but i am so busy before Vienna that i did not find the time to go to the doctor.
I like the Fet version too.
Other Fets could be used with small modification to the resistor values.
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Old 4th November 2011, 11:17 PM   #3055
RCruz is offline RCruz  Switzerland
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The fet version is super clean.... might sound powerfull and spacious with a good PSU.

I believe it is DC coupled right ?
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Old 4th November 2011, 11:32 PM   #3056
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For maximum speed and lower distortion :
The Fet-BJT cascode version.

Rien Ne Va Plus
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Old 4th November 2011, 11:33 PM   #3057
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Right, DC coupled without servo. DC stability is very good.
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Old 4th November 2011, 11:38 PM   #3058
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Forgot a wire.
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Old 4th November 2011, 11:44 PM   #3059
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Hi Joachim,

I was just gonna tell you that you may borrow my glasses
Looks GOOD my friend, I like both !

Perhaps I'll give it a try next week on a perf board.

Stop teasing me Joachim

atb,


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Old 4th November 2011, 11:54 PM   #3060
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Yes, try it and give me your impression. It can be setup with conventional global feedback too. It should work with any low level transistors. I used 2SA1015 and 2SC1815. 4 cent a piece at Reichelt.
Looking good and seeing good can be quite different (:
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