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High Current Version of B1 Buffer Preamp wanted
High Current Version of B1 Buffer Preamp wanted
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Old 18th July 2017, 06:19 AM   #11
ElFishi is offline ElFishi  Europe
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Quote:
Originally Posted by tiefbassuebertr View Post
another approach is the use of the BF862 (SOT23 package, SMD marking code "2Ap") and large copper plain for the "D" (drain) PIN.
Datasheet p.3:
Note
1. Main heat transfer is via the gate lead.
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Old 10th November 2017, 03:34 PM   #12
tiefbassuebertr is offline tiefbassuebertr  Germany
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this thread is also of interest in this case:
BF862 based SE Class A Headamp without the HEAT
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Old 10th November 2017, 06:06 PM   #13
Nelson Pass is offline Nelson Pass  United States
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High Current Version of B1 Buffer Preamp wanted
If a B1 with high current is what you want, you are probably best off with
paralleling the same Jfets in that circuit. The 2SK170/2SJ74 and the LS
versions are still the best for performance IMHO.

Biased at 10 mA, they will deliver more than that with a 20 ohm or so
output impedance at lower distortion than anything else I have played with.

Paralleling them will give you the increase in current and the output impedance
reduction that you would expect - The Beast with a Thousand Jfets is an
excellent example.

Other parts, such as Fairchild's work, but only to approach that performance.
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Old 23rd January 2018, 03:57 PM   #14
marconi118 is offline marconi118  Germany
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Quote:
Originally Posted by Nelson Pass View Post
If a B1 with high current is what you want, you are probably best off with
paralleling the same Jfets in that circuit. The 2SK170/2SJ74 and the LS
versions are still the best for performance IMHO.

Biased at 10 mA, they will deliver more than that with a 20 ohm or so
output impedance at lower distortion than anything else I have played with.

Paralleling them will give you the increase in current and the output impedance
reduction that you would expect - The Beast with a Thousand Jfets is an
excellent example.

Other parts, such as Fairchild's work, but only to approach that performance.
what Fairchild part numbers?
P and N channel?
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