$ 1 5.0E-6 10.20027730826997 50 5.0 50
a 560 448 480 448 1 15.0 -15.0 1000000.0
r 480 448 432 448 0 10000.0
t 432 448 400 448 0 1 0.6010752043499691 0.6017145432879778 100.0
v 560 528 560 464 0 0 40.0 2.5 0.0 0.0 0.5
w 400 464 400 528 0
w 400 528 480 528 0
w 480 528 560 528 0
w 560 432 608 432 0
f 400 352 464 352 1 1.5
s 336 352 336 448 0 1 true
s 336 272 336 352 0 1 true
w 400 352 336 352 0
x 439 504 512 510 0 24 TL431
x 256 402 293 408 0 24 ON
x 255 311 302 317 0 24 OFF
w 464 272 400 272 0
w 400 272 336 272 0
w 336 272 208 272 0
172 208 272 144 272 0 6 9.0 35.0 -5.0 0.0 0.5 input voltage
g 208 592 160 592 0
w 656 592 400 592 0
w 400 592 336 592 0
w 336 592 208 592 0
w 656 592 784 592 0
w 784 592 864 592 0
x 156 113 622 119 0 24 Low voltage cutoff (3-36V) using TL431
x 489 350 611 356 0 24 P-MOSFET
x 181 635 734 639 0 16 You can/should omit resistor under TL431 if you don't need OFF switch
x 158 177 557 181 0 16 + Built-in switch buttons and optional indicator LED
x 673 446 696 449 0 10 500k
x 674 460 718 463 0 10 multiturn
x 454 324 461 327 0 10 S
x 458 383 466 386 0 10 D
w 464 368 656 368 0
w 784 368 864 368 0
w 400 352 400 432 0
r 400 528 400 592 0 200.0
r 400 352 400 272 0 200000.0
w 464 336 464 272 0
w 336 528 336 448 0
w 400 528 336 528 0
d 384 464 384 432 1 0.805904783
w 384 432 400 432 0
w 384 464 400 464 0
r 784 480 784 368 0 1700.0
x 157 141 660 145 0 16 + Zero off state current (unless auto-reconnect feature is used)
x 159 195 785 199 0 16 + Short circuit protection (short circuit causes voltage drop that triggers cutoff)
x 159 213 843 217 0 16 + Reverse voltage protection (unless you use MOSFET with diode or press OFF button!)
w 704 368 784 368 0
w 656 368 672 368 0
w 672 368 704 368 0
174 688 272 624 272 0 500000.0 0.49010000000000004 reconnect hysteresis
w 656 288 656 320 0
w 608 448 608 432 0
w 656 480 656 592 0
174 656 480 608 416 0 500000.0 0.39110000000000006 cutoff voltage
x 644 255 667 258 0 10 500k
x 704 282 868 286 0 16 reconnect hysteresis
x 665 478 773 482 0 16 cutoff voltage
162 784 480 784 592 1 2.1024259 1.0 0.0 0.0
w 656 416 656 368 0
w 688 272 688 352 0
w 656 320 656 352 0
w 624 272 480 272 0
x 745 304 818 308 0 16 (optional)
x 181 657 853 661 0 16 If you want automatic reconnect with hysteresis, just add another pot across MOSFET
x 180 677 701 681 0 16 and connect cutoff pot to it's wiper instead of + rail. (as illustrated)
x 181 697 699 701 0 16 Off current will no longer be zero and OFF switch will be overriden.
x 158 230 670 234 0 16 + Possibility to add automatic reconnect with hysteresis if needed
x 158 159 836 163 0 16 + Only 5 components for basic setup!!! (without OFF button, LED and auto reconnect)
o 17 64 0 289 5.0 0.025 0 -1
o 8 64 0 35 0.3125 0.025 1 -1
o 7 64 0 35 40.0 9.765625E-5 2 -1