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MOSFET Source Follower Headamp
MOSFET Source Follower Headamp
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Old 3rd February 2018, 09:36 PM   #401
xrk971 is offline xrk971  United States
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MOSFET Source Follower Headamp
It’s the above schematic but with 470uF output cap. I adjusted the resistors to give 55mA bias. I don’t have amp anymore so don’t remember exact values. Use sim to derive. I would build the Pocket Class A though as it sounds much better.
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Old 17th July 2018, 09:18 AM   #402
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BF862 went to life buy stage ,which FET can be used in this circuit from NXP other than BF862
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Old 17th July 2018, 01:35 PM   #403
xrk971 is offline xrk971  United States
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MOSFET Source Follower Headamp
There’s no equivalent. Close in performance and higher voltage is 2SK170BL but those are even harder to find. Plenty still available from Aliexpress or eBay. They are too small and cheap to fake so will be genuine as far as I have seen.

e.g., 10PCS BF862 JFET N-CHAN 20V SOT-23 ZETEX NEW | eBay

100 for $16:
Free shipping 100pcs/lot BF862,215 BF862 JFET N CHAN 20V SOT 23 Best quality-in Integrated Circuits from Electronic Components & Supplies on Aliexpress.com | Alibaba Group
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Old 17th July 2018, 04:32 PM   #404
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