enter image description here a long time ago I saw a cct using a single op amp (NE5532) to convert un-balanced to balanced lines, it had splt rails where its output pin was grounded and the rails became the output. i.e. because the output was grounded the rail pins shifted creating the balanced output. Anyone familiar with this design and where can I find it.

see attached

Thanks guys.

  • \$\begingroup\$ sorry guys, PIN 1 to ground. \$\endgroup\$
    – HiTekHead
    Jan 24, 2018 at 23:23
  • \$\begingroup\$ Are you sure? NE5532 is a dual op amp. What signal level are you working with? \$\endgroup\$
    – vofa
    Jan 24, 2018 at 23:42
  • \$\begingroup\$ Balanced but offset DC.. Why not use unity gain +1, -1 with dual OA's? \$\endgroup\$ Jan 24, 2018 at 23:55
  • \$\begingroup\$ Thanks Tony, but part of the objective was to do it with a single ne5532 op amp stage. \$\endgroup\$
    – HiTekHead
    Jan 27, 2018 at 2:45
  • \$\begingroup\$ Yes ne5532 is a dual op amp \$\endgroup\$
    – HiTekHead
    Jan 27, 2018 at 2:47

1 Answer 1


I have seen what you asked for but think this is better.

enter image description here

Notice I edited/ corrected the CM input range for this after copying from datasheet which used a single supply.

enter image description here


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