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single supply op-amp rectifier

Discussion in 'Electronic Design' started by Danny, Mar 25, 2008.

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  1. Danny

    Danny Guest

    i need to rework a LM358 opamp based recision rectifier from a split
    +/- 5v supply to a single ended supply. i biased the non-invert input
    to half supply volts using a voltage divider. the feed is the
    secondary of a CT. for symmetry i would think that i still connect the
    secondary of the CT to the same points in the circuit (do i need to
    capicitive couple?i didn't b4). Also I would think thet the output ma
    meter would be placed between o/p pin and ground...or should this also
    be between the output and the noninvert pin bias voltage. many thx.
  2. MooseFET

    MooseFET Guest

    You need to use resistors etc to make the bias points. The time
    constants only depend on the capacitors and resistors that interact.

    Go get yourself a copy of LTSpice AKA SwitcherCad-3 from
    and try modeling the circuit.
  3. Danny

    Danny Guest


    CT is a current transformer. ma=mA. Thanks for your corrections.

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