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Old 24th June 2009, 12:51 AM   #11
psgr is offline psgr  United States
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Hi,

How does it compare to J310 version that you posted in the Jfet Boz section?
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Old 24th June 2009, 04:47 AM   #12
EUVL is offline EUVL  Europe
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Take my word. Solder the JFET directly on your PCB without adaptor. And come back and tell us the difference.




Patrick


PS One way to match without adaptor :

http://www.diyaudio.com/forums/showt...32#post1828332
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Old 24th June 2009, 06:34 AM   #13
juma is offline juma  Serbia
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Quote:
Originally posted by psgr
Hi,

How does it compare to J310 version that you posted in the Jfet Boz section?
J310 has its' charms, but BF862 is a significantly better choice here.
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Old 24th June 2009, 01:41 PM   #14
juma is offline juma  Serbia
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Quote:
Originally posted by EUVL
Take my word. Solder the JFET directly on your PCB without adaptor. And come back and tell us the difference...
Curiosity got better of me so I gave it a try, with and without grid stopper and there was no difference worth mentioning (compared to JFET on adapter PCB).
The only thing I noticed is a slight change of Id - due to a larger cooling surface I suppose...
What's your experience?
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Old 24th June 2009, 03:00 PM   #15
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Quote:
Originally posted by juma


J310 has its' charms, but BF862 is a significantly better choice here.
The J310 reqires some serious selection for noise. I have heard that FET's from this series, J305 on, are used in very low noise applications by some. In general I'd keep a small gate stopper on the BF862 since it has a 700MHz FOM, someone here was successful with SMT ferrite beads to preserve ultra-low noise.
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Old 24th June 2009, 04:29 PM   #16
juma is offline juma  Serbia
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It's good to know that for MC/MM/mic preamps - we are talking line level (CD/DAC out) here so noise level is not a primary concern
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Old 24th June 2009, 09:51 PM   #17
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Quote:
Originally posted by juma
This is how adapter PCbs look prior to soldering an cutting (DIL8 OpAmp is in pic for size comparison) :

I dreamt last nite that a copy of those boards appeared under my pillow!!!?? Did you make them??
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Old 24th June 2009, 10:33 PM   #18
juma is offline juma  Serbia
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It must have made quite an impression on you
I'm responsible just for design of this simple micro-PCB, but the heavy burden of actually producing them fell on my friend's and DIY fellow's shoulders - he is the one with means and the will to manufacture such a miniscule PCB
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Old 25th June 2009, 03:34 AM   #19
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Doomed to be a friendless dreamer....
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Old 25th June 2009, 06:27 AM   #20
juma is offline juma  Serbia
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NowI'm under impression that you would like to have some of these PCBs.
If so, PM me.
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