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The Pioneer Super Linear Circuit
The Pioneer Super Linear Circuit
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Old 5th December 2017, 01:43 PM   #81
EUVL is offline EUVL  Europe
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A copy-and-paste error in Appendix 2.
R15~20 are missing.
They should be the same as those in Appendix 1.

Well spotted.


Sorry for that,
Patrick

PS Will update revision in a day or two.
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Old 5th December 2017, 11:23 PM   #82
Algar_emi is offline Algar_emi  Canada
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The Pioneer Super Linear Circuit
Hi. Other typo error, Passive crossfeed section, BOM, both capacitors should be ECHU series I think because EUHU doesn't exist...
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Old 6th December 2017, 04:07 AM   #83
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Correct and well spotted.
I better wait a few more days before update, in case you can find more.


Patrick
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Old 8th December 2017, 07:19 PM   #84
Algar_emi is offline Algar_emi  Canada
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The Pioneer Super Linear Circuit
I would suggest that you add the Passive crossfeed and Protection pcb schematic into the document. They are the only schematics missing. Thanks
SB
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Old 9th December 2017, 08:05 AM   #85
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F5 Headamp ?


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Old 11th December 2017, 12:43 PM   #86
Morde is offline Morde  Finland
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Yesterday I populated the regulator boards and I measured the output voltages with no load while feeding the input with two 9 V batteries in series. I got the following results:
+Vout1 = 14.99 V
+Vout2 = 14.97 V
-Vout1 = -15.05 V
-Vout2 = -14.95 V

I suppose these values are good enough so I don't need to adjust the voltages with R1?
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Old 11th December 2017, 01:35 PM   #87
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Yes, especially if you are using either the CCS bias or the DC servo.


Patrick
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Old 14th December 2017, 07:31 AM   #88
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Yet one more mistake in the document.
In the BoM, you will need of course 6 each of 2SA1312 and 2SC3324 per channel, and not 5.


Sorry for that,
Patrick
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Old 15th December 2017, 10:23 PM   #89
Morde is offline Morde  Finland
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A couple of question about the power supply...

I finished my PSU setup (see attachments) with schottky diodes in a dual bridge rectifier form followed by a 3300 uF Nichicon HW(M) 25 V capacitor per polarity and the Xen discrete regulator board. I have 2 x (25 VA / 2 x 15 V) toroidal trafos => one per channel feeding the PSUs. The question is: when not loading the PSUs I get +/- 14,99 V, but when I attach a load of 150 mA with 100 ohm resistors I get + 14,6 / 14,7 V and -14,9 / -14,8 V. Is this too much of a difference between pos./neg. if I consider a situation with no servo and CCS boards attached? How should I adjust the value of R1 to even out the voltages?

I’m preparing to build my test setup now with roughly matched devices but PSU setup will be the same for my final build with better matched BJTs.
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Last edited by Morde; 15th December 2017 at 10:45 PM. Reason: Finally I got the attached pictures with iPad...
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Old 15th December 2017, 11:12 PM   #90
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The first thing I would check is whether the voltage drop at load comes from the regulators.
(They do have a small output impedance.)
It may well be that the drop comes from upstream, i.e. you do not have enough drop out voltage after the transformers.
You can easily test this with a regulated lab supply set at say +/-19V supplying the regulators directly.

In principle, if you do not use servo and also not CCS, then you will see the difference between rail voltages almost 1:1 at the output.
This you can trim out by adjusting the values of R9 or R10.
You can easily see their effect by changing their values in the Spice files.


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