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-   -   Discrete opamps. (https://www.diyaudio.com/forums/analog-line-level/338057-discrete-opamps.html)

georgehifi 18th May 2019 12:29 AM

Discrete opamps.
 
Anyone know about these, he makes a few different ones.

SX22B Discrete Dual Op Amp HiFi Preamp Board Integrated Module Replace 4558d


Nobsound-Make Hi-Fi Popular

Cheers George

rsavas 18th May 2019 04:28 PM

It does look professionally done (spice macro-model included), datasheet looks like it was done by TI/BB.

canvas 19th May 2019 06:39 AM

They are advertised as Translinear Current Mode Amplifier. Some of the characteristics are quite impressive.

dreamth 19th May 2019 06:47 AM

Quote:

Originally Posted by georgehifi (https://www.diyaudio.com/forums/analog-line-level/338057-discrete-opamps-post5794704.html#post5794704)
Anyone know about these, he makes a few different ones.

SX22B Discrete Dual Op Amp HiFi Preamp Board Integrated Module Replace 4558d


Nobsound-Make Hi-Fi Popular

Cheers George

they are definitely a replacement for 4558... only!

georgehifi 19th May 2019 07:00 AM

Quote:

Originally Posted by dreamth (https://www.diyaudio.com/forums/analog-line-level/338057-discrete-opamps-post5795807.html#post5795807)
they are definitely a replacement for 4558... only!

How is this? do you have his circuit diagrams of his discrete opamps, love to see them if you have.

Cheers George

dreamth 19th May 2019 07:11 AM

just joking...where did you see its datasheet?

georgehifi 19th May 2019 09:10 AM

Quote:

Originally Posted by dreamth (https://www.diyaudio.com/forums/analog-line-level/338057-discrete-opamps-post5795823.html#post5795823)
just joking...where did you see its datasheet?

Haven't seen any full data sheets, but there are partial spec sheets on some if you have a look.

Cheers George

dreamth 19th May 2019 09:37 AM

Quote:

Originally Posted by rsavas (https://www.diyaudio.com/forums/analog-line-level/338057-discrete-opamps-post5795271.html#post5795271)
It does look professionally done (spice macro-model included), datasheet looks like it was done by TI/BB.

Quote:

Originally Posted by canvas (https://www.diyaudio.com/forums/analog-line-level/338057-discrete-opamps-post5795804.html#post5795804)
They are advertised as Translinear Current Mode Amplifier. Some of the characteristics are quite impressive.

Quote:

Originally Posted by georgehifi (https://www.diyaudio.com/forums/analog-line-level/338057-discrete-opamps-post5795888.html#post5795888)
Haven't seen any full data sheets, but there are partial spec sheets on some if you have a look.
Cheers George

professionally done by... some of the ...what characteristics?
Honestly...i think people must start reading some real books on op-amps!
Let's just debunk this new myth:
4.5 nv today is just a shame.Nothing on current noise as they needed to run the input transistor at large currents.

On the other hand i bet they measured its noise with a ne5532/34 based sound card or analyzer as they couldn't get lower than the ne532/34 noise itself.
270db open loop gain to get just 0.0001thd in closed loop...I can understand thus the source of its big but not huge slew rate...
What phase inversion in common bjt op-amps?
18v max supply with discrete transistors? WTF!!!


Well let me quote Jodie Foster on Contact(i never read the book, the movie was awesome enough) : If it's only us then the Universe is an awful waste of space.

georgehifi 19th May 2019 09:48 AM

Quote:

Originally Posted by dreamth (https://www.diyaudio.com/forums/analog-line-level/338057-discrete-opamps-post5795901.html#post5795901)
professionally done by... some of the ...what characteristics?
Honestly...i think people must start reading some real books on op-amps!
Let's just debunk this new myth:
4.5 nv today is just a shame.Nothing on current noise as they needed to run the input transistor at large currents.

On the other hand i bet they measured its noise with a ne5532/34 based sound card or analyzer as they couldn't get lower than the ne532/34 noise itself.
270db open loop gain to get just 0.0001thd in closed loop...I can understand thus the source of its big but not huge slew rate...
What phase inversion in common bjt op-amps?
18v max supply with discrete transistors? WTF!!!

dreamth

Your previous forum name wasn't "Jocko Homo" by any chance was it??

Cheers George

dreamth 19th May 2019 09:51 AM

Unfortunately not!He's probably making big money by just being a "proffessional outcast" ! I thought of trying his i/v discrete circuit then i found much better ways combining real IC op-amps and transistors.
Looking at his former account it looks like he's from the USA...The only other country i ever lived in apart from mine was the UK...and i've heard that the Americans need a VISA to get to Romania :)


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