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The Pioneer Super Linear Circuit
The Pioneer Super Linear Circuit
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Old 7th October 2017, 04:11 AM   #1
EUVL is offline EUVL  Europe
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Default The Pioneer Super Linear Circuit

Every now and then, we do something totally different, for fun but also for bench-marking.

This is almost 180 to what we normally do.
No FETs, no NOS parts, no 0.3% matching (although hfe matching does improve performance significantly).
All parts are in active production; you can get them from Digikey or Mouser for very little money.

It is Class A, has no global feedback, can deliver +/-10V into 30R before clipping.
It delivers 1Vrms into 30R at an amazing -97dB THD, and has a -3dB bandwidth of 2MHz.

You can read about it here :
http://xen-audio.com/documents/SLHPA...c%20171005.pdf


Patrick

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Attached Images
File Type: jpg 170928 SL HPA Proto 1 Top.JPG (298.7 KB, 1670 views)
File Type: jpg 170928 SL HPA Proto 1 Btm.JPG (309.4 KB, 1641 views)
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Old 7th October 2017, 04:23 AM   #3
EUVL is offline EUVL  Europe
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Some more measurements
(Green is input, cyan is output.)


Patrick

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Attached Images
File Type: png 170923 SL HPA Proto1 10kHz Sine.png (63.8 KB, 1593 views)
File Type: png 170923 SL HPA Proto1 10kHz Sq.png (61.5 KB, 1555 views)
File Type: png 170923 SL HPA Proto1 10kHz Tri.png (63.6 KB, 1529 views)
File Type: png 170928 SL HPA Proto1 Freq No Load.png (58.2 KB, 190 views)
File Type: png 170928 SL HPA Proto2 Freq 27R.png (57.5 KB, 187 views)
File Type: png 170928 SL HPA Proto2 Clipping 27R.png (66.9 KB, 199 views)
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Old 7th October 2017, 05:24 AM   #4
EUVL is offline EUVL  Europe
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Some Spice files to play with.


Patrick

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Attached Files
File Type: asc SL HPA V1b Buf_Serv THD.asc (11.4 KB, 103 views)
File Type: asc SL HPA V1b Buf_Serv Freq.asc (11.4 KB, 67 views)
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Old 7th October 2017, 06:01 AM   #5
ammel68 is offline ammel68  United States
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The Pioneer Super Linear Circuit
Thanks for sharing such a cool design Patrick.
The choice and use of mostly SMD devices just plain sucks and will unfortunately be a major deterrent to many who may want to try this super-duper Pioneer Japo design.

Keep up the great work and Merry Christmas.
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Old 7th October 2017, 06:15 AM   #6
EUVL is offline EUVL  Europe
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Many people said that before, until they tried.
Now they are all hooked on SMD.

You can of course build the same thing with TO92 devices.
Here is such an example built by another DIYer.
The problem is, he has plenty of matched 2SA970 / 2SC2240 on hand.
You will only find their SOT23 equivalent (2SA1312 / 2SC3324) in active production now.

So for me, performance comes first.
I have no problems with SMD.
And they are also pin-compatible with the likes of BC807/817, which is a big advantage.


Patrick

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File Type: jpg TC SLHPA Proto.jpg (221.2 KB, 679 views)
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Old 7th October 2017, 06:31 AM   #7
ammel68 is offline ammel68  United States
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The Pioneer Super Linear Circuit
Yeah, I guess it's what you get used to or can adjust to since TO-92 devices seem to be slowly but surely being phased out.
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Old 7th October 2017, 06:49 AM   #8
maust is offline maust
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Very cool, and impressive performance!

I was once a SMD sceptic, now I'm a believer For me, stuffing a SMD board takes about half the time it would with through holes, and error correction is also easier.

If you make PCBs available at some point, I'm certainly in!
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Old 7th October 2017, 06:58 AM   #9
EUVL is offline EUVL  Europe
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I was also surprised by the performance, and that it did not receive more attention all these years.

> If you make PCBs available at some point, I'm certainly in!

Too early.

The protos will have to sit on a proper test platform with cross feed and protection boards, etc.
Then they will go through some independent auditions.
When all these are finished and we are happy with the final outcome, we'll think about a public offer.

At least 4~6 weeks more.


Patrick
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Old 7th October 2017, 07:03 AM   #10
EUVL is offline EUVL  Europe
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For completeness, this is a more complicated version to address the poor PSRR mentioned in the article.


Patrick

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File Type: asc SL BJT HPA CCS Bias Sch.asc (9.2 KB, 165 views)
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