JISBOS - great headamp !

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Almost a year ago I bought a pair of Sennheiser HD555 headphones (50 Ohms) and since then I've been searching for appropriate headamp. I've tried diamond buffer and about dozen usual topologies found here and at Headwize.com, but nothing really shined until I gave JISBOS (http://www.diamondstar.de/jisbos/jisbos_design.html ) a try.
Some people mentioned it here but no one really told us how good it is. The design is pretty explicit, it is very stable and it sounds extremely good. The amp is completely noiseless.
The end result is so good that I had to report it here, and I recommend it to anyone who is in search for a unity gain headamp - small power buffer.

Steinchen and Amb (from Headwize), thanks for this great headamp !

I changed an original schematic a bit (parts availability) and this is how it looks:
 

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Zen Mod said:
congrats !
with almost same topology - you can try scaled down Pass's F5 .

Thanks,
probably I'll do it, if it's unity gain stable; scaled-down F4 (IRF610/9610 on output, Iq=100mA) sounded a bit dull.
Also, F5 has higher OLG => stronger GNFB
JISBOS uses strong Source and Emitter degeneration to minimize GNFB.

Pozdrav !
 
Onvinyl said:
Hi Juma,
What's in front of you HP-amp? With a HD-650, I found a unity-gain amp (that followed both a riaa-amp or a CDP) wasn't sufficient. Switching back to loudspeakers would almost destroy them. Or my ears...
Rüdiger


Hi Rüdiger ,
I have HD555 (low Z - 50 Ohms), so unity gain is OK. In front of JISBOS is modified M-Audio SuperDAC 2496 with 1.7 V RMS output.
Mit poti am 11 uhr es ist schon zu laut. :D

Tschüs!
 
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