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Old 16th March 2009, 04:34 PM   #21
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nice works
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Old 16th March 2009, 05:10 PM   #22
EUVL is offline EUVL  Europe
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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
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Old 16th March 2009, 05:52 PM   #23
TB is offline TB  United States
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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
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Old 16th March 2009, 06:40 PM   #24
EUVL is offline EUVL  Europe
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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
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Old 16th March 2009, 07:07 PM   #25
flg is offline flg  United States
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Good Work Patrick Thanks
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Old 17th March 2009, 07:37 PM   #26
EUVL is offline EUVL  Europe
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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
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Old 17th March 2009, 08:11 PM   #27
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Suggestions for best place to get parts? Mouser? Digikey?

dave
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Old 18th March 2009, 02:29 AM   #28
EUVL is offline EUVL  Europe
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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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Old 18th March 2009, 02:43 AM   #29
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Thanx.

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Old 18th March 2009, 10:57 AM   #30
ashaw is offline ashaw  Australia
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Default 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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