LM358 fan control schematic

schematic

Simulator applet: http://www.falstad.com/circuit-java/
Paste everything below into the “Import” window:

$ 1 5.0E-6 9.001713130052181 30 5.0 43
v 1056 592 1056 496 0 0 40.0 12.0 0.0 0.0 0.5
a 720 448 832 448 0 11.0 0.0 1000000.0
172 608 384 528 384 0 6 5.04 12.0 0.0 0.0 0.5 Voltage
g 1056 592 1056 608 0
g 944 496 944 512 0
g 672 592 672 608 0
w 832 448 880 448 0
r 880 448 960 448 0 10.0
r 976 496 1056 496 0 100.0
w 976 496 976 544 0
r 864 544 752 544 0 10000.0
t 960 448 960 496 0 1 -6.13981445702215 0.6741231726814478 1000.0
r 608 384 608 432 0 12000.0
x 317 461 562 464 0 12 NTC 20C=12K 30C=7K3 40C=4K8 45C=3K9
x 317 480 581 483 0 12 Design temperature: 30C-40C Max speed: >42C
w 1056 336 1056 496 0
x 1005 470 1028 473 0 12 FAN
x 979 417 1023 420 0 12 13N06L
x 914 423 929 426 0 12 1K
c 720 384 832 384 0 1.0E-6 0.7309724773130948
w 720 384 720 432 0
w 832 384 832 448 0
x 1084 538 1126 541 0 12 10-15 V
x 618 516 643 519 0 12 NTC
x 747 497 784 500 0 12 LM358
x 675 301 1311 305 0 14 33K resistor provides compensation for varying supply voltage. Omit if using a regulated 12 V supply.
x 680 516 721 520 0 14 Thres.
r 672 432 672 336 0 33000.0
w 720 432 672 432 0
w 672 432 608 432 0
174 672 432 720 496 0 5000.0 0.48020000000000007 Threshold
w 976 544 864 544 0
w 752 544 720 544 0
w 720 544 720 464 0
174 608 432 656 496 0 13000.0 0.1733 NTC
w 672 592 672 496 0
w 672 496 656 496 0
w 656 496 656 464 0
x 201 357 644 361 0 14 Stabilised 5 V reference can be omitted if using regulated 12 V supply.
x 763 357 949 361 0 14 Capacitor prevents oscillation
x 837 570 995 574 0 14 Transistor inverts output.
w 672 336 1056 336 0
x 746 514 853 518 0 14 Powered by 12 V
x 981 436 1035 439 0 12 N-ch. FET
x 966 469 975 472 0 12 G
x 984 507 993 510 0 12 D
x 926 506 934 509 0 12 S
o 8 1 0 34 10.0 0.05 0 -1

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