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single supply op-amp rectifier

D

Danny

Jan 1, 1970
0
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.
 
M

MooseFET

Jan 1, 1970
0
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.


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 www.linear.com
and try modeling the circuit.
 
D

Danny

Jan 1, 1970
0
Jim,

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

Daniel
 
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