Opinions on Panther amplifier design

olev · 4th April 2009, 08:49 PM

No fuss and easy talk, here is the schematic, what do you think?

kaos · 4th April 2009, 09:24 PM

I think the schematics too small (hard to see).

Why an input buffer with an input impedance of 50K driving a differential with an input impedance of 100K? What good does the buffer do in that scenario?

Mr Evil · 4th April 2009, 10:01 PM

It seems like folded-cascode amps are popping up a lot recently.

I wanted to ask the same question as kaos about the input buffer, and also:

Why load the output of the folded-cascode with a resistor to ground? Isn't that just a waste of gain? If the gain is too high, wouldn't it be better to send some local feedback back to the LTP?
The driver transistors are cascoded. Is this just to keep them within their SOA, or is it for reducing distortion?

olev · 4th April 2009, 10:23 PM

I am not the designer of that amplifier, since it is not a big manufacturer who makes it there are no reviews or comparisons - so if one cannot compare it sound wise and the manufacturer has the full schematic available I asked about the design (not some is this Brand XXX amplifier good based on the casing looks).

4th April 2009, 08:49 PM	#1
olev diyAudio Member Join Date: May 2007	Opinions on Panther amplifier design No fuss and easy talk, here is the schematic, what do you think?

4th April 2009, 10:01 PM	#3
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	It seems like folded-cascode amps are popping up a lot recently. I wanted to ask the same question as kaos about the input buffer, and also: Why load the output of the folded-cascode with a resistor to ground? Isn't that just a waste of gain? If the gain is too high, wouldn't it be better to send some local feedback back to the LTP? The driver transistors are cascoded. Is this just to keep them within their SOA, or is it for reducing distortion? __________________ https://mrevil.asvachin.eu/

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4th April 2009, 09:24 PM	#2
kaos diyAudio Member Join Date: Dec 2005 Location: Los Angeles	I think the schematics too small (hard to see). Why an input buffer with an input impedance of 50K driving a differential with an input impedance of 100K? What good does the buffer do in that scenario?

4th April 2009, 10:23 PM	#4
olev diyAudio Member Join Date: May 2007	I am not the designer of that amplifier, since it is not a big manufacturer who makes it there are no reviews or comparisons - so if one cannot compare it sound wise and the manufacturer has the full schematic available I asked about the design (not some is this Brand XXX amplifier good based on the casing looks).

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