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Old 20th December 2004, 09:58 AM   #21
jaume is offline jaume  Europe
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I've just found this thread.

I'm still in time to get one board for an stereo headphone?

Thanks.
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Old 20th December 2004, 02:55 PM   #22
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Quote:
Originally posted by jaume
I've just found this thread.

I'm still in time to get one board for an stereo headphone?

Thanks.

Please email me.
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Old 15th December 2010, 06:17 PM   #23
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Hi Max,
I want to build a OPA627 headphone amp. do you still have the pcb?
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Old 17th December 2010, 05:20 PM   #24
qusp is offline qusp  Australia
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6 years ago? wow if hes still got one i'd be just a little surprised. I really wish people would read the date of the last post before bumping a thread
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Old 17th December 2010, 05:32 PM   #25
PMA is offline PMA  Europe
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Though this is also old:

Audio Buffer in english

I will have some PCBs in January 2011, as I received some demand to produce it again.

Regards,
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Old 20th February 2013, 08:22 AM   #26
Jenyok is offline Jenyok  Russian Federation
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Which opamp, instead of OPA627/OPA637, I could used in "class A" as preamp for BUF634 circuit ?
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Attached Images
File Type: gif buf634_class a.gif (12.2 KB, 123 views)

Last edited by Jenyok; 20th February 2013 at 08:26 AM.
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Old 20th February 2013, 01:39 PM   #27
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Careful with the 637! It isn't stable with low gain.

Any fet input single opamp will work but Pavel also recommends the OPA134 or OPA132 (similar, one is just better specs)

The OPA132/4 and dual OPA2132/4 are good, solid, inexpensive, DIY-friendly opamps.

PS I missed the 'class A' part, that may involve a bit more investigation ...
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Old 20th February 2013, 02:50 PM   #28
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I had designed the circuit to work with the OPA134 by connecting together pins 5 and 8. My original web host went out of business and I haven't put everything back yet. However I did upload the headphone files:

Headphone Amp w/Crossfeed
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Old 20th February 2013, 03:02 PM   #29
Jenyok is offline Jenyok  Russian Federation
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Maxhawk
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Mate, please, put circuit of headphonws amp here, to this site.
Thanks.
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Old 20th February 2013, 03:40 PM   #30
agdr is offline agdr  United States
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Maxhawk - just curious, how much background hiss does your design get with the input grounded and the volume all the way up? I'm building something similar in another thread with an OPA627 + NJM4556. I didn't know about this old thread. Looks like a good design! I wanted to add the Jan Meier switchable crossfeed from the old Headwize post but couldn't figure out a way to get it stuffed into the feedback loop without messing up the DC parameters.
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