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The Pioneer Super Linear Circuit
The Pioneer Super Linear Circuit
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Old 6th February 2019, 11:11 AM   #261
EUVL is offline EUVL  Europe
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This is not a beginnerís project, as we always maintained.
Weíll see how much we can help; But we cannot spoon feed, and certainly not remote debug.
Having said that, a Beta 22 is not much simpler either.
But if you have no understanding of circuitry, then maybe you should not attempt any of our projects.

All NPN & PNP transistors should be matched, including SOT23s and TO220s.
You can do that with a decent DMM which has an hfe-measurement function.
You need min. 50 pcs each for the Toshibaís, and 20 each for the Sankenís.
The left-overs from the amp are then used for regulators.
And you will need to have a SOT 23 test socket.

I personally match everything else, including all resistors and caps.
You should at least use 0.5% resistors all over.
Power resistors are best matched using a constant current source of 150mA (made up using a LM317, see 317 datasheet) and a DMM.
Design LM317 Constant Current Source Circuits

You need to have a dual-lab-supply with adjustable voltage and current limit (set to 200mA) for testing.
A functions generator and an oscilloscope will also be very useful.
If you donít even have any of those, I can only suggest you leave this project for now until you have enough equipment and experience.

And Iíd rather be honest.


Cheers,
Patrick
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Old 6th February 2019, 01:32 PM   #262
damon1983 is offline damon1983  Russian Federation
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Quote:
Originally Posted by EUVL View Post
Every now and then, we do something totally different, for fun but also for bench-marking.

This is almost 180į 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

.
OK... Are you thinking that this crap (-80 db on 50 Hz and others up to 1 kHz) is normal, really?!!
This isn't bad PSRR, it's a full aberration of PCB.
p/s: another junk audio with amazing hum.
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File Type: jpg crappy headphones amplifier spectrum [SLHPA].JPG (132.3 KB, 208 views)
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Old 6th February 2019, 01:48 PM   #263
jan.didden is offline jan.didden  Europe
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Not sure I get your point here.
Are you blaming an audio circuit for a junk power supply?
The write-up mentions the source of the hum.

Jan
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Old 6th February 2019, 01:52 PM   #264
EUVL is offline EUVL  Europe
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The measurement was made with a lab supply and no enclosure or shielding for the amp.
No doubt you know how to check with the spice model published what the PSRR is.
And the circuit only has current sources and emitter followers connected to the rails.

And of course none of those who has actually built has heard any hum from their phones.


Cheers,
Patrick
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Old 11th February 2019, 01:34 AM   #265
Algar_emi is offline Algar_emi  Canada
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The Pioneer Super Linear Circuit
No hum at all from mine...
SB
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Old 11th February 2019, 05:21 AM   #266
mlackey is offline mlackey  United States
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Quote:
Originally Posted by EUVL View Post
I think Morde mentioned this also somewhere early in the thread ?
Thank you, I did not know this had already been adressed. I found the discussion in posts #97-100.

But one question, and please forgive my lack of knowledge: how did you arrive at the value of R_iv = 5.1K? The resistors R15,16 have that value, is it that easy? Or derived in some other way?
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Old 11th February 2019, 08:27 AM   #267
EUVL is offline EUVL  Europe
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Gain = (R15 // R16 + R30) / (R7 // R8)

where // means parallel.

In the GB document, R15,16 are specified as 6.2k, giving a gain of 10.
But of course you can change those values for lower gain.
You also need to make sure there is enough voltage (> 1.3V) across R15,16 to bias the output followers.
The easiest for you is to try things out in Spice first.


Patrick
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Old 11th February 2019, 01:18 PM   #268
staccatiss is offline staccatiss  Germany
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Hi,

What SOT23 test socket do you use?

Quote:
Originally Posted by EUVL View Post
This is not a beginnerís project, as we always maintained

The left-overs from the amp are then used for regulators.
And you will need to have a SOT 23 test socket.

I personally match everything else, including all resistors and caps.
You should at least use 0.5% resistors all over.
Power resistors are best matched using a constant current source of 150mA (made up using a LM317, see 317 datasheet) and a DMM.
Design LM317 Constant Current Source Circuits

You need to have a dual-lab-supply with adjustable voltage and current limit (set to 200mA) for testing.
A functions generator and an oscilloscope will also be very useful.
If you donít even have any of those, I can only suggest you leave this project for now until you have enough equipment and experience.

And Iíd rather be honest.


Cheers,
Patrick
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Old 11th February 2019, 01:28 PM   #269
emyeuoi is offline emyeuoi  Italy
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The Pioneer Super Linear Circuit
Quote:
Originally Posted by staccatiss View Post
Hi,

What SOT23 test socket do you use?
Something like this:

SOT23 Peak Component Adapter | Peak Electronic Design Limited
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Old 11th February 2019, 05:01 PM   #270
Johnny Canuck is online now Johnny Canuck  Canada
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Default 2SK209BL

For those assembling parts for the Pioneer SLHPA, Digikey has a quantity of 2SK209BL available in small lots (i.e. <3000 pcs) that are available.
-K-
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