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The XEN XELF Headphone Buffer
The XEN XELF Headphone Buffer
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Old 17th June 2021, 08:17 PM   #41
lasercut is offline lasercut  Ireland
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The XEN XELF Headphone Buffer
I can measure, will do for BJTs, but would prefer to mess with the MOSFETs as little as possible... too expensive to risk damage from ESD or another mistake.

I was thinking of trimpot aswell, with 1 power input for both channels traces would need to be cut if you were simply measuring current draw from the supply, is there a better way than that to measure bias current individually?
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Old 17th June 2021, 08:29 PM   #42
EUVL is offline EUVL  Europe
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Across R11.
Or solder one channel first and measure current draw of lab supply.


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Old 17th June 2021, 08:39 PM   #43
lasercut is offline lasercut  Ireland
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The XEN XELF Headphone Buffer
Ok, perfect.
Thanks for helping, hopefully all goes smoothly.
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Old 18th June 2021, 02:58 PM   #44
BucketInABucket is offline BucketInABucket  Hong Kong
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I downloaded the spice and tried replacing the opamp with an OPA1652, is it normal for the THD to rise a ton? Bias is at 200mA (R9 at 1.7k).
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Old 18th June 2021, 04:06 PM   #45
EUVL is offline EUVL  Europe
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No idea what is in the opamp model.

The XELF input has high impedance.
So it will not load the opamp in any way.


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Old 18th June 2021, 04:39 PM   #46
BucketInABucket is offline BucketInABucket  Hong Kong
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It's just the OPA1652 PSpice model I found on the TI website. I also replaced the Toshiba small signal BJTs with BC847B/857B but that had no effect really (which is good). Wonder what's going on...
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Old 1st July 2021, 03:42 PM   #47
lasercut is offline lasercut  Ireland
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The XEN XELF Headphone Buffer
XELF build went smoothly .
It sounds as great as you might expect, very smooth yet very musical and hugely resolving (captures 'weight' of the sound very accurately), not much more you could ask for.

Last edited by lasercut; 1st July 2021 at 04:11 PM.
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Old 1st July 2021, 03:59 PM   #48
EUVL is offline EUVL  Europe
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So satisfied customer ?
Photos ?


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Old 1st July 2021, 05:10 PM   #49
lasercut is offline lasercut  Ireland
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The XEN XELF Headphone Buffer
It is a bit rough looking, the caps (Nichicon ES non-polar) were backordered so the gold ones are some spares sitting in for now.
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Old 1st July 2021, 05:37 PM   #50
EUVL is offline EUVL  Europe
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What bias, and what load ?


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