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NE5532 offset nulling circuit (in LTspice IV format)

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Dec 26th, 2014
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  1. Version 4
  2. SHEET 1 1108 680
  3. WIRE 336 -208 336 -240
  4. WIRE 336 -112 336 -128
  5. WIRE 416 -112 336 -112
  6. WIRE 336 -96 336 -112
  7. WIRE 416 -96 416 -112
  8. WIRE -224 -48 -224 -80
  9. WIRE -160 -48 -224 -48
  10. WIRE -16 -48 -80 -48
  11. WIRE 128 -48 -16 -48
  12. WIRE -16 -32 -16 -48
  13. WIRE 128 -32 128 -48
  14. WIRE -224 -16 -224 -48
  15. WIRE 128 64 128 48
  16. WIRE 208 64 128 64
  17. WIRE 336 64 288 64
  18. WIRE -16 80 -16 48
  19. WIRE 128 80 128 64
  20. WIRE 96 160 -96 160
  21. WIRE 128 176 128 160
  22. WIRE 192 176 128 176
  23. WIRE 336 192 336 64
  24. WIRE 336 192 256 192
  25. WIRE 368 192 336 192
  26. WIRE 464 192 464 144
  27. WIRE 464 192 432 192
  28. WIRE 480 192 464 192
  29. WIRE 592 192 560 192
  30. WIRE -112 208 -304 208
  31. WIRE 96 208 96 160
  32. WIRE 192 208 96 208
  33. WIRE 0 240 -64 240
  34. WIRE 96 240 96 208
  35. WIRE 96 240 64 240
  36. WIRE -304 272 -304 208
  37. WIRE 336 288 336 192
  38. WIRE 96 304 96 240
  39. WIRE -112 320 -112 288
  40. WIRE -112 320 -208 320
  41. WIRE -64 320 -64 240
  42. WIRE -64 320 -112 320
  43. WIRE -112 336 -112 320
  44. WIRE 592 336 592 192
  45. WIRE -208 352 -208 320
  46. WIRE -304 448 -304 352
  47. WIRE -112 448 -112 416
  48. WIRE 96 448 96 384
  49. FLAG -112 448 0
  50. FLAG 416 -96 0
  51. FLAG -304 448 0
  52. FLAG 592 336 0
  53. FLAG 336 -240 V+
  54. FLAG 224 160 V+
  55. FLAG 336 -16 V-
  56. FLAG 224 224 V-
  57. FLAG -16 80 0
  58. FLAG -224 64 V-
  59. FLAG -224 -160 V+
  60. FLAG 96 448 0
  61. FLAG -96 160 Vin-biased
  62. FLAG 336 288 Vout-biased
  63. FLAG 464 144 Vout-AC
  64. FLAG -208 352 Vin-AC
  65. SYMBOL res 112 -48 R0
  66. SYMATTR InstName R1
  67. SYMATTR Value 1K
  68. SYMBOL res 304 48 R90
  69. WINDOW 0 0 56 VBottom 2
  70. WINDOW 3 32 56 VTop 2
  71. SYMATTR InstName R2
  72. SYMATTR Value 10K
  73. SYMBOL res -96 304 R180
  74. WINDOW 0 36 76 Left 2
  75. WINDOW 3 36 40 Left 2
  76. SYMATTR InstName R3
  77. SYMATTR Value {10K*b}
  78. SYMBOL res -128 320 R0
  79. SYMATTR InstName R4
  80. SYMATTR Value {10K*(1-b)}
  81. SYMBOL res 576 176 R90
  82. WINDOW 0 0 56 VBottom 2
  83. WINDOW 3 32 56 VTop 2
  84. SYMATTR InstName R5
  85. SYMATTR Value 600
  86. SYMBOL polcap 0 224 M90
  87. WINDOW 0 0 32 VBottom 2
  88. WINDOW 3 32 32 VTop 2
  89. SYMATTR InstName C4
  90. SYMATTR Value 10µ
  91. SYMBOL polcap 432 208 M270
  92. WINDOW 0 32 32 VTop 2
  93. WINDOW 3 0 32 VBottom 2
  94. SYMATTR InstName C5
  95. SYMATTR Value 47µ
  96. SYMBOL voltage 336 -112 R0
  97. WINDOW 123 0 0 Left 2
  98. WINDOW 39 0 0 Left 2
  99. SYMATTR InstName V1
  100. SYMATTR Value 12
  101. SYMBOL voltage 336 -224 R0
  102. WINDOW 123 0 0 Left 2
  103. WINDOW 39 0 0 Left 2
  104. SYMATTR InstName V2
  105. SYMATTR Value 12
  106. SYMBOL voltage -304 256 R0
  107. WINDOW 123 24 124 Left 2
  108. WINDOW 39 0 0 Left 2
  109. WINDOW 0 -121 29 Left 2
  110. WINDOW 3 -173 62 Left 2
  111. SYMATTR InstName Vtest
  112. SYMATTR Value SINE(0 1 300)
  113. SYMBOL Opamps\\opamp2 224 128 R0
  114. SYMATTR InstName U2
  115. SYMATTR Value NE5532
  116. SYMBOL res -32 -48 R0
  117. SYMATTR InstName R6
  118. SYMATTR Value 100
  119. SYMBOL res -240 -32 R0
  120. WINDOW 0 -38 38 Left 2
  121. WINDOW 3 -124 68 Left 2
  122. SYMATTR InstName R7
  123. SYMATTR Value {50K*(1-a)}
  124. SYMBOL res -240 -176 R0
  125. WINDOW 0 -40 41 Left 2
  126. WINDOW 3 -89 71 Left 2
  127. SYMATTR InstName R8
  128. SYMATTR Value {50K*a}
  129. SYMBOL res -176 -64 M90
  130. WINDOW 0 0 56 VBottom 2
  131. WINDOW 3 32 56 VTop 2
  132. SYMATTR InstName R9
  133. SYMATTR Value 200K
  134. SYMBOL res 80 288 R0
  135. SYMATTR InstName R10
  136. SYMATTR Value 100K
  137. SYMBOL res 112 64 R0
  138. WINDOW 0 -51 30 Left 2
  139. WINDOW 3 -64 60 Left 2
  140. SYMATTR InstName R11
  141. SYMATTR Value 100K
  142. TEXT -56 -248 Left 2 !.lib NE5532.sub
  143. TEXT -56 -224 Left 2 !.tran 30ms
  144. TEXT 136 464 Left 2 ;R10 is needed for the + input pin bias current in the presence of C4.
  145. TEXT -56 -192 Left 2 !.param a = 0.45
  146. TEXT -320 496 Left 2 ;R3 & R4 are stand-in for a volume pot.
  147. TEXT -184 -128 Left 2 ;R7 & R8 are the Voffset bias pot.
  148. TEXT -56 -168 Left 2 !.param b = 0.9
  149. TEXT 136 488 Left 2 ;Using a fairly large value here for demo purposes to induce a large Voffset.
RAW Paste Data

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