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Old 21st June 2014, 11:02 PM   #51
AJT is offline AJT  Philippines
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Quote:
Originally Posted by AndrewT View Post
Have you calculated it for me?
Can you show how to calculate the BJT input impedance?
afaik, input impedance is beta times re, but
i do not want to repeat what others have done,
that is what simulators are for,
i would rather build it and then have a listen,
after all that was what the discussion and simulation was all about,
hey this is DIY and people build things, is it not?
i do not value precision for precision's sake, there are
practical side to all these....

i have seen this topology in the TI manuals from the early 80's,
nothing new here except the use of simulators....

topologies come and go....happens all the time...

Quote:
Originally Posted by basi View Post
Hi!!
I build this simple Buffer 2 Years ago and it works fantastic very neutral Sounding.
Greatings From Croatia!!!

Click the image to open in full size.
nice one Basi, if memory serves me right, i have seen this topology in one of Marantz amps, couldn't recall the model number as only the guts and power traffo was given to me to repurpose....
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Old 10th July 2014, 05:53 AM   #52
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Quote:
Originally Posted by dadod View Post
Thanks Elvee for your suggestion.
I put it even father and now distortion at 20kHz is 0.000002%.
I am going to use one of those buffers in my lineamp(no NFB) and I am not sure if the complexity is to much as the gain block is in 1ppm region.
Could be that simpler version of the buffer is good enough.
Damir
Hi, very impressive measurements.
I am a beginner with Spice sims and this circuit is unbelievable ...
Sorry i got lost a little in the replies , but i wonder if your have actually built it.
If i understand well the sim results fix the theoretical max we can obtained from a circuit.
Anyway congratulations again for this result. Impressive.
Never seen something of similar.
Thanks and regards, gino
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Old 10th July 2014, 09:42 AM   #53
dadod is online now dadod  Croatia
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Quote:
Originally Posted by ginetto61 View Post
Hi, very impressive measurements.
I am a beginner with Spice sims and this circuit is unbelievable ...
Sorry i got lost a little in the replies , but i wonder if your have actually built it.
If i understand well the sim results fix the theoretical max we can obtained from a circuit.
Anyway congratulations again for this result. Impressive.
Never seen something of similar.
Thanks and regards, gino
Gino, very similar buffer was used in my GainWire mk2 line&phone preamp, 20 PCB sold.
Damir
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Old 10th July 2014, 11:09 AM   #54
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Quote:
Originally Posted by dadod View Post
Gino, very similar buffer was used in my GainWire mk2 line&phone preamp, 20 PCB sold.
Damir
Hi Damir, i have found the 3d about the amp but not the one about the preamp. I am mostly interested in buffers. No voltage gain needed.
Where i have to look for the pcb ?
Thanks and regards, gino
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Old 10th July 2014, 02:56 PM   #55
dadod is online now dadod  Croatia
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Quote:
Originally Posted by ginetto61 View Post
Hi Damir, i have found the 3d about the amp but not the one about the preamp. I am mostly interested in buffers. No voltage gain needed.
Where i have to look for the pcb ?
Thanks and regards, gino
Gino,goto post #20, there you will find the link, Danir.
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Old 10th July 2014, 05:19 PM   #56
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Quote:
Originally Posted by dadod View Post
Gino,goto post #20, there you will find the link, Danir.
Thanks a lot Damir.
Kind regards, gino
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