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To try this simulation yourself, paste this text into the window that opens when you select the "FileImport From Text..." menu item in the Falstad simulator at https://www.falstad.com/circuit

$ 1 0.000005 15.472767971186109 50 5 43 5e11
t 272 336 320 336 0 1 3.7301932669057525 0.5520360185363322 100 default
r 320 352 320 448 0 5600
c 320 352 400 352 0 0.000047 3.926261737800598 0.001
r 400 352 400 448 0 100
w 320 448 240 448 0
r 240 448 240 336 0 56000
w 272 336 240 336 0
w 240 336 240 256 0
c 240 256 176 256 0 0.000047 4.495655197147763 0.001
r 176 256 112 256 0 33000
w 320 320 320 288 0
r 320 288 400 288 0 56000
w 400 288 400 208 0
c 400 208 480 208 0 0.000001 4.551448129874243 0.001
r 320 288 320 224 0 3900
w 240 256 240 112 0
32 \0 0 1e13 0 0 1.5 0 0 2 1 1 0 0 1
t 240 112 320 112 0 1 0.47276412152235103 0.6012479637127663 100 \0
r 320 128 320 192 0 3900
r 320 128 400 128 0 56000
w 400 208 400 128 0
r 320 96 320 0 0 5600
c 320 96 400 96 0 0.000047 3.9168469166708357 0.001
r 400 96 400 0 0 100
r 240 112 240 0 0 56000
w 240 0 320 0 0
w 320 0 400 0 0
w 400 448 320 448 0
w 320 448 320 464 0
g 320 464 320 480 0 0
g 320 192 320 208 0 0
w 320 224 288 224 0
w 288 224 176 224 0
w 176 224 176 0 0
w 240 0 176 0 0
w 176 0 176 16 0
R 176 16 176 32 0 0 40 9 0 0 0.5
R 112 256 112 192 0 1 184 1 0 0 0.5
w 480 208 544 208 0
g 544 336 544 368 0 0
r 544 336 544 208 0 1000000
o 37 16 0 4099 2.5 0.00009765625 0 2 37 3

0:00 Introduction
0:51 Op amp gain stages
3:29 Complementary common emitter stage
4:05 Falstad simulation
5:43 What's it for?