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Discrete opamps.
Discrete opamps.
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Old 18th May 2019, 12:29 AM   #1
georgehifi is offline georgehifi  Australia
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Default 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
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Last edited by georgehifi; 18th May 2019 at 12:31 AM.
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Old 18th May 2019, 04:28 PM   #2
rsavas is offline rsavas  Canada
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It does look professionally done (spice macro-model included), datasheet looks like it was done by TI/BB.
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Old 19th May 2019, 06:39 AM   #3
canvas is offline canvas  Taiwan
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They are advertised as Translinear Current Mode Amplifier. Some of the characteristics are quite impressive.
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Old 19th May 2019, 06:47 AM   #4
dreamth is offline dreamth  Romania
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Quote:
Originally Posted by georgehifi View Post
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!
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Old 19th May 2019, 07:00 AM   #5
georgehifi is offline georgehifi  Australia
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Originally Posted by dreamth View Post
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
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Old 19th May 2019, 07:11 AM   #6
dreamth is offline dreamth  Romania
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just joking...where did you see its datasheet?
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Old 19th May 2019, 09:10 AM   #7
georgehifi is offline georgehifi  Australia
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Quote:
Originally Posted by dreamth View Post
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
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Last edited by georgehifi; 19th May 2019 at 09:13 AM.
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Old 19th May 2019, 09:37 AM   #8
dreamth is offline dreamth  Romania
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Quote:
Originally Posted by rsavas View Post
It does look professionally done (spice macro-model included), datasheet looks like it was done by TI/BB.
Quote:
Originally Posted by canvas View Post
They are advertised as Translinear Current Mode Amplifier. Some of the characteristics are quite impressive.
Quote:
Originally Posted by georgehifi View Post
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.

Last edited by dreamth; 19th May 2019 at 09:43 AM.
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Old 19th May 2019, 09:48 AM   #9
georgehifi is offline georgehifi  Australia
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Quote:
Originally Posted by dreamth View Post
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
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Old 19th May 2019, 09:51 AM   #10
dreamth is offline dreamth  Romania
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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

Last edited by dreamth; 19th May 2019 at 10:14 AM.
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