B1-Turbo on a Chip - Page 3

nicoch58 · 16th March 2009, 03:34 PM

nice works

EUVL · 16th March 2009, 04:10 PM

The 3 lucky ones will get their PCBs in an envelope to be posted some time this week. I have addresses for all 3. You will also get an assembly note per email.

In addition to reporting back in 2 months, I would ask you to perform your tests in an audio application, which is what it is all about. For measurement or other applications, opamps are much cheaper.

Happy SMD-soldering,
Patrick

TB · 16th March 2009, 04:52 PM

Hello EUVL,
I am a beginner in the field of electronics and my question might sound strange.
Can your buffer be used as a replacement for BUF03-J or BUF634 in headphone amplifier output stage?
Are there any limitations where your buffer can be used? ( I also think about "Aunt Corey's Buffered Passive Preamplifier")

Thanks

EUVL · 16th March 2009, 05:40 PM

The BF862 can in theory deliver something like 20mA, though the distortion would be fairly high. So I think practical load would be not much less than 1k if you want good performance. But it operates in pure Class A.

The BUF634, on the other hand, can output a lot more current. I believe it also has a lower output impedance. So it all depends on what load you want to drive this with.

Patrick

flg · 16th March 2009, 06:07 PM

Good Work Patrick

Thanks

EUVL · 17th March 2009, 06:37 PM

The 6 PCBs have gone to the post today in 3 envelopes to 3 different countries.

The assembly notes were posted per email yesterday evening.
So now we just have to wait for the results and feedbacks.

Patrick

planet10 · 17th March 2009, 07:11 PM

Suggestions for best place to get parts? Mouser? Digikey?

dave

EUVL · 18th March 2009, 01:29 AM

Digikey has most, easy for one-stop shop.

Maybe the 3 of you could also consider buying and matching JFETs together.
50 pieces should do for the 6 PCBs.

Read the Assembly Notes. It's all there.

Patrick

planet10 · 18th March 2009, 01:43 AM

Thanx.

dave

ashaw · 18th March 2009, 09:57 AM

Why are you not using the LSK170 that comes in a SOT23 and is compatible with the 2SK170 or even better, the LSK389 that is a matched dual LSK170 in a SOIC-8 package. will post attached concept PCB.

16th March 2009, 03:34 PM	#21
nicoch58 diyAudio Member Join Date: Oct 2004	nice works __________________ Sic58

16th March 2009, 06:07 PM	#25
flg diyAudio Member Join Date: Jul 2005 Location: North East	Good Work Patrick Thanks __________________ “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” Dr. Seuss

17th March 2009, 07:11 PM	#27
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	Suggestions for best place to get parts? Mouser? Digikey? dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

18th March 2009, 01:43 AM	#29
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	Thanx. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

18th March 2009, 09:57 AM	#30
ashaw diyAudio Member Join Date: Jul 2006	LSK170 Why are you not using the LSK170 that comes in a SOT23 and is compatible with the 2SK170 or even better, the LSK389 that is a matched dual LSK170 in a SOIC-8 package. will post attached concept PCB.


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16th March 2009, 04:10 PM	#22
EUVL diyAudio Member Join Date: Oct 2003	The 3 lucky ones will get their PCBs in an envelope to be posted some time this week. I have addresses for all 3. You will also get an assembly note per email. In addition to reporting back in 2 months, I would ask you to perform your tests in an audio application, which is what it is all about. For measurement or other applications, opamps are much cheaper. Happy SMD-soldering, Patrick

16th March 2009, 04:52 PM	#23
TB diyAudio Member Join Date: Jun 2004 Location: Northern VA	Hello EUVL, I am a beginner in the field of electronics and my question might sound strange. Can your buffer be used as a replacement for BUF03-J or BUF634 in headphone amplifier output stage? Are there any limitations where your buffer can be used? ( I also think about "Aunt Corey's Buffered Passive Preamplifier") Thanks

16th March 2009, 05:40 PM	#24
EUVL diyAudio Member Join Date: Oct 2003	The BF862 can in theory deliver something like 20mA, though the distortion would be fairly high. So I think practical load would be not much less than 1k if you want good performance. But it operates in pure Class A. The BUF634, on the other hand, can output a lot more current. I believe it also has a lower output impedance. So it all depends on what load you want to drive this with. Patrick

17th March 2009, 06:37 PM	#26
EUVL diyAudio Member Join Date: Oct 2003	The 6 PCBs have gone to the post today in 3 envelopes to 3 different countries. The assembly notes were posted per email yesterday evening. So now we just have to wait for the results and feedbacks. Patrick

18th March 2009, 01:29 AM	#28
EUVL diyAudio Member Join Date: Oct 2003	Digikey has most, easy for one-stop shop. Maybe the 3 of you could also consider buying and matching JFETs together. 50 pieces should do for the 6 PCBs. Read the Assembly Notes. It's all there. Patrick

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