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Old 17th March 2012, 12:25 PM   #1
nickds1 is offline nickds1  England
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Default New Doug Self pre-amp design...

Just a heads-up...

This month's (UK) Elektor (April 2012, dropped on the mat this morning...) has a long article by Doug Self with, what he says is, his first published new pre-amp design since 1996. Side notes on Peter Baxandall, references to "Baxandall and Self on Audio Power" - all sorts of stuff. Pt. 1 is about design methodology and his pet subjects of sources of noise & distortion - does include the schematic though.

Kind of fun... (if you are a Self-devotee)

Specifications
Test conditions: supply voltage 17.6 V; all measurements symmetrical; tone control defeat disabled.
Test equipment: Audio Precision Two Cascade Plus 2722 Dual Domain (@Elektor Labs)
THD+N (200 mV in, 1 V out) 0.0015% (1 kHz, B = 22 Hz – 22 kHz)
0.0028% (20 kHz, B = 22 Hz – 80 kHz)
THD+N (2 V in, 1 V out) 0.0003% (1 kHz, B = 22 Hz – 22 kHz)
0.0009% (20 kHz, B = 22 Hz – 80 kHz)
S/N (200 mV in) 96 dB (B = 22 Hz – 22 kHz)
98.7 dBA
Bandwidth 0.2 Hz – 300 kHz
Max. output voltage (200 mV in) 1.3 V
Balance +3.6 dB to –6.3 dB
Tone control 8 dB (100 Hz)
8.5 dB (10 kHz)
Crosstalk R to L –98 dB (1 kHz)
–74 dB (20 kHz)
L to R –102 dB (1 kHz)
–80 dB (20 kHz)
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Last edited by nickds1; 17th March 2012 at 12:32 PM.
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Old 17th March 2012, 01:34 PM   #2
Mooly is offline Mooly  United Kingdom
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Can we ask what the main active devices are... I'm guessing maybe LM4562's
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Old 17th March 2012, 01:55 PM   #3
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According to Elektor's web page, the following ICs are used:

IC1,IC3,IC5-IC10,IC12,IC14-IC18 = NE5532, e.g. ON Semiconductor type NE5532ANG

IC2,IC4,IC11,IC13 = LM4562, e.g. National Semiconductor type LM4562NA/NOPB
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Old 17th March 2012, 02:02 PM   #4
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Quote:
Originally Posted by currentflow View Post
According to Elektor's web page, the following ICs are used:

IC1,IC3,IC5-IC10,IC12,IC14-IC18 = NE5532, e.g. ON Semiconductor type NE5532ANG

IC2,IC4,IC11,IC13 = LM4562, e.g. National Semiconductor type LM4562NA/NOPB
Oh, you're kidding... There are better chips than these out there. What ever
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Old 17th March 2012, 02:05 PM   #5
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Originally Posted by dirkwright View Post
Oh, you're kidding... There are better chips than these out there. What ever
I'm sure Douglas Self is aware of the alternatives (and "aware" is an understatement in this context).
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Old 17th March 2012, 02:07 PM   #6
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If the primary metric is THD+N (and I believe we can safely assume that it is, with this design) then those devices are pretty much on the sweet spot.
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Old 17th March 2012, 02:09 PM   #7
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Originally Posted by abraxalito View Post
If the primary metric is THD+N (and I believe we can safely assume that it is, with this design) then those devices are pretty much on the sweet spot.
There are many chips that have lower noise than the ones he has chosen.

Maybe he expects hobbyists to go ripping into old consoles and sound equipment to get at the NE5532 chips...
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Old 17th March 2012, 02:10 PM   #8
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Yes but not at the prices of NE5532 - which was what I was hinting at in speaking of the 'sweet spot'. Unless you can enlighten us?
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Old 17th March 2012, 02:13 PM   #9
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by currentflow View Post
According to Elektor's web page, the following ICs are used:

IC1,IC3,IC5-IC10,IC12,IC14-IC18 = NE5532, e.g. ON Semiconductor type NE5532ANG

IC2,IC4,IC11,IC13 = LM4562, e.g. National Semiconductor type LM4562NA/NOPB
Thanks

I've great respect for Doug's offerings but I do feel he overlooks or rather dismisses listening tests as part of the design procedure. I'm not surprised to see the 5532 tbh

Interesting...
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Old 17th March 2012, 02:20 PM   #10
brianco is offline brianco  Ireland
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Originally Posted by dirkwright View Post
There are many chips that have lower noise than the ones he has chosen.

Maybe he expects hobbyists to go ripping into old consoles and sound equipment to get at the NE5532 chips...
You seem to forget that the end purpose is to play music etc....not to drive test instrumentation.

They are available in bulk or singly virtually everywhere for very low cost.....except, I expect, at audio component 'boutiques' which delight in making far larger profits per $ than do the big players such as digikey etc.

Last edited by brianco; 17th March 2012 at 02:24 PM.
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