Version 4
SHEET 1 1860 680
WIRE -64 -80 -224 -80
WIRE 128 -80 -64 -80
WIRE 288 -80 128 -80
WIRE 576 -80 288 -80
WIRE 848 -32 672 -32
WIRE 1200 -32 848 -32
WIRE 1440 -32 1200 -32
WIRE -64 16 -64 0
WIRE 336 16 -64 16
WIRE -64 48 -64 16
WIRE 48 64 32 64
WIRE 288 64 288 -80
WIRE 288 64 272 64
WIRE 672 64 672 -32
WIRE 848 64 848 -32
WIRE 800 80 768 80
WIRE 48 128 -64 128
WIRE 336 128 336 16
WIRE 336 128 272 128
WIRE -224 144 -224 -80
WIRE 576 176 576 -80
WIRE 1440 176 1440 -32
WIRE 304 192 272 192
WIRE 352 192 304 192
WIRE 464 192 448 192
WIRE 544 192 464 192
WIRE 848 192 848 160
WIRE 672 208 672 144
WIRE 672 208 608 208
WIRE 736 208 672 208
WIRE 768 208 768 80
WIRE 768 208 736 208
WIRE 848 208 848 192
WIRE 848 208 784 208
WIRE 976 208 848 208
WIRE 1088 208 1056 208
WIRE 1104 208 1088 208
WIRE 1264 208 1232 208
WIRE 544 224 512 224
WIRE 848 224 848 208
WIRE 784 240 784 208
WIRE 48 256 32 256
WIRE 288 256 272 256
WIRE 1088 256 1088 208
WIRE 1264 256 1264 208
WIRE 352 288 352 272
WIRE 448 288 448 192
WIRE 448 288 352 288
WIRE -64 304 -64 128
WIRE 96 304 -64 304
WIRE 304 304 304 192
WIRE 304 304 96 304
WIRE -64 320 -64 304
WIRE 352 320 352 288
WIRE 288 336 288 256
WIRE -224 400 -224 224
WIRE -64 400 -64 384
WIRE -64 400 -224 400
WIRE 288 400 -64 400
WIRE 352 400 288 400
WIRE 576 400 576 240
WIRE 576 400 352 400
WIRE 784 400 784 304
WIRE 784 400 576 400
WIRE 848 400 848 304
WIRE 848 400 784 400
WIRE 1088 400 1088 320
WIRE 1088 400 848 400
WIRE 1264 400 1264 320
WIRE 1264 400 1088 400
WIRE 1440 400 1440 256
WIRE 1440 400 1264 400
WIRE -64 448 -64 400
FLAG -64 448 0
FLAG 96 304 V_triangle
FLAG 736 208 V_gate
FLAG 848 192 V_Motor
FLAG 1200 96 V_lowpass
FLAG 1104 208 V_low2
FLAG 512 224 V_low2
FLAG 464 192 V_neg_feed
FLAG 128 -80 VCC_3V
FLAG 32 256 VCC_3V
FLAG 32 64 0
FLAG 1200 -32 VCC_Variable
SYMBOL SBORKA\\TIMER\\555 160 160 R0
SYMATTR InstName U1
SYMBOL voltage -224 128 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 3
SYMBOL res -80 -96 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res -80 32 R0
SYMATTR InstName R2
SYMATTR Value 500
SYMBOL cap -80 320 R0
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL Robertugo\\comp5_all 576 144 R0
SYMATTR InstName U3
SYMATTR SpiceModel LM339
SYMBOL res 656 48 R0
SYMATTR InstName R5
SYMATTR Value 500
SYMBOL pmos 800 160 M180
SYMATTR InstName M1
SYMATTR Value Si9803DY
SYMBOL ind 832 208 R0
SYMATTR InstName L1
SYMATTR Value 100u
SYMATTR SpiceLine Rser=2
SYMBOL diode 800 304 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL res 1072 192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 2k
SYMBOL cap 1072 256 R0
SYMATTR InstName C3
SYMATTR Value 20u
SYMBOL res 1248 192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 2k
SYMBOL cap 1248 256 R0
SYMATTR InstName C4
SYMATTR Value 10u
SYMBOL res 336 304 R0
SYMATTR InstName R9
SYMATTR Value 50k
SYMBOL res 336 176 R0
SYMATTR InstName R10
SYMATTR Value 50k
SYMBOL voltage 1440 160 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value PULSE(7 4 60ms 140ms)
SYMBOL cap 272 336 R0
SYMATTR InstName C5
SYMATTR Value 10n
TEXT -186 -150 Left 2 !.tran 0 200m 0 2m
TEXT 496 440 Left 2 ;low pass rc constant 2x20ms, 1x40ms  might be enough, maybe longer time constant\nL1 is a motor, PMOS and D1 could be swapped for a motor driver
TEXT 72 -152 Left 2 ;the 555/comparator need constant voltage, 3V ldo should work, comparator has open collector output
TEXT 760 -80 Left 2 ;V2 dropping from 7V to 4V (after 60ms for stabilisation of lowpass feedback)