Anyone interested in PCB's for OPA627/BUF634 based headphone amp? - Page 3

jaume · 20th December 2004, 08:58 AM

I've just found this thread.

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

Thanks.

Maxhawk · 20th December 2004, 01:55 PM

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.

mingming · 15th December 2010, 05:17 PM

Hi Max,
I want to build a OPA627 headphone amp. do you still have the pcb?

qusp · 17th December 2010, 04:20 PM

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

PMA · 17th December 2010, 04:32 PM

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,

Jenyok · 07:26 AM

Which opamp, instead of OPA627/OPA637, I could used in "class A" as preamp for BUF634 circuit ?
.

AudioLapDance · 20th February 2013, 12:39 PM

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 ...

Maxhawk · 20th February 2013, 01:50 PM

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

Jenyok · 20th February 2013, 02:02 PM

Maxhawk
.
Mate, please, put circuit of headphonws amp here, to this site.
Thanks.
.

agdr · 20th February 2013, 02:40 PM

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.

17th December 2010, 04:32 PM	#25
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	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, __________________ Pavel Macura http://www.linkedin.com/pub/pavel-macura/4/783/637 http://web.telecom.cz/macura/audiopage.html

20th February 2013, 01:50 PM	#28
Maxhawk diyAudio Member Join Date: Oct 2002 Location: Duluth, GA	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 __________________ Robert Cheng Linkwitz Transform 2 Wiki

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20th December 2004, 08:58 AM	#21
jaume diyAudio Member Join Date: Nov 2003 Location: Rasquera, a nice village in the mountain and near the sea :)	I've just found this thread. I'm still in time to get one board for an stereo headphone? Thanks.

15th December 2010, 05:17 PM	#23
mingming diyAudio Member Join Date: Dec 2010	Hi Max, I want to build a OPA627 headphone amp. do you still have the pcb?

17th December 2010, 04:20 PM	#24
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	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

20th February 2013, 12:39 PM	#27
AudioLapDance diyAudio Member Join Date: Jun 2003 Location: Hamilton, was Ottawa (Canada)	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 ...

20th February 2013, 02:02 PM	#29
Jenyok diyAudio Member Join Date: May 2012 Location: Russia, Moscow	Maxhawk . Mate, please, put circuit of headphonws amp here, to this site. Thanks. .

20th February 2013, 02:40 PM	#30
agdr diyAudio Member Join Date: Sep 2010	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.