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Old 4th August 2018, 06:31 AM   #21
EUVL is offline EUVL  Europe
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> But the THD distortion is not nice - THD 0.287% is not acceptable.

I got 0.03% THD at 0.92V pk on 32R with 120mA bias.


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Old 5th August 2018, 05:02 AM   #22
PRR is offline PRR  United States
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At that higher idle current, I get 0.04% with matchbook math.

It's mostly about the gain (NFB) and the current swing (as fraction of idle current).
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Old 5th August 2018, 05:13 AM   #23
EUVL is offline EUVL  Europe
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120mA is not high for 32 ohm.


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Old 7th August 2018, 01:25 AM   #24
edmortney is offline edmortney
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Low-impedance (under 50 ohm) headphones will play well at home with your receiver and on-the-go with your smart phone, and that's why the vast majority of in-, on-, and over-the-ear headphones are low-impedance designs. High-impedance models are much better suited to home than on-the-go use. Sennheiser and Beyerdynamic are two companies that offer high-impedance consumer headphones with up to 600 ohm-rated designs.
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Old 7th August 2018, 04:08 AM   #25
miro1360 is offline miro1360  Europe
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I did this one, but I did not have time to test it in reality ...

https://ctrlv.cz/shots/2018/08/07/ETvB.png

https://ctrlv.cz/shots/2018/08/07/FGck.png

PCB 5x5cm:
https://ctrlv.cz/shots/2018/08/07/lTxw.png
https://ctrlv.cz/shots/2018/08/07/cPej.png

https://ctrlv.cz/shots/2018/08/07/MZqW.png
THD=0.002%/20k (250mW/32R)

IMD:
https://ctrlv.cz/shots/2018/08/07/Ase2.png
0.06%/19k+20k (50mW/32R)

OLG:
https://ctrlv.cz/shots/2018/08/07/4iVr.png
Attached Images
File Type: png H01.png (58.3 KB, 99 views)
Attached Files
File Type: asc H01_in2_edit2_ccsJ_ccsR_ks_run.asc (12.6 KB, 5 views)
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Old 7th August 2018, 04:36 AM   #26
EUVL is offline EUVL  Europe
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It's a Scott Wurcer Phono without RIAA but with NFB.
A simplified universal differential or single ended phono preamp


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