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eSingle 4V supply. Source of 2N7002 and negative side of capacitor at virtual ground (minus input of LMV358). Drain of 2N7002 and positive of cap to LMV358 output. Gate of 2N7002 to groung with/without 10K resistor.
Tried some 2N7000 (TO-92). Same result.
If I understand it right than this sounds ok. You just can't ever go reverse because then the FET's body diode will kick in.
Something is wrong there. But hard to say from far away.
-- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
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Please post a circuit fragment in LTspice. This 2n7002 circuit behavior is memorably odd. Be very careful to identify real ground and virtual ground differently.
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