diff --git a/hw/spice/res2.6.asc b/hw/spice/res2.6.asc
new file mode 100644
index 00000000..9d21fc72
--- /dev/null
+++ b/hw/spice/res2.6.asc
@@ -0,0 +1,315 @@
+Version 4
+SHEET 1 5176 960
+WIRE 3744 -16 2928 -16
+WIRE 3728 16 3680 16
+WIRE 3456 64 3328 64
+WIRE 3536 64 3456 64
+WIRE 3632 64 3616 64
+WIRE 3680 64 3680 16
+WIRE 3680 64 3632 64
+WIRE 3456 80 3456 64
+WIRE 3632 80 3632 64
+WIRE 3744 96 3744 -16
+WIRE 3680 112 3680 64
+WIRE 3712 112 3680 112
+WIRE 1184 128 1088 128
+WIRE 1296 128 1184 128
+WIRE 1568 128 1296 128
+WIRE 2624 128 1568 128
+WIRE 2928 128 2928 -16
+WIRE 2928 128 2848 128
+WIRE 3808 128 3808 16
+WIRE 3808 128 3776 128
+WIRE 3936 128 3808 128
+WIRE 3712 144 3680 144
+WIRE 3936 160 3936 128
+WIRE 2688 176 2512 176
+WIRE 3456 176 3456 160
+WIRE 3456 176 3360 176
+WIRE 3536 176 3456 176
+WIRE 3632 176 3632 144
+WIRE 3632 176 3616 176
+WIRE 3680 176 3680 144
+WIRE 3680 176 3632 176
+WIRE 3328 192 3328 64
+WIRE 1296 224 1296 128
+WIRE 1856 224 1760 224
+WIRE 2080 224 1856 224
+WIRE 3680 224 3680 176
+WIRE 3680 224 3184 224
+WIRE 1696 240 1600 240
+WIRE 3936 240 3824 240
+WIRE 4064 240 3936 240
+WIRE 4096 240 4064 240
+WIRE 1088 256 1088 128
+WIRE 1184 256 1184 128
+WIRE 2368 256 2256 256
+WIRE 1760 272 1760 224
+WIRE 2624 288 2624 128
+WIRE 1600 304 1600 240
+WIRE 2512 304 2512 256
+WIRE 2592 304 2512 304
+WIRE 2848 304 2848 128
+WIRE 3040 304 2960 304
+WIRE 3360 304 3360 176
+WIRE 2080 320 2080 304
+WIRE 2256 320 2256 256
+WIRE 2256 320 2080 320
+WIRE 2688 320 2688 176
+WIRE 2688 320 2656 320
+WIRE 2704 320 2688 320
+WIRE 3040 320 3040 304
+WIRE 3056 320 3040 320
+WIRE 3104 320 3104 224
+WIRE 3104 320 3056 320
+WIRE 3136 320 3104 320
+WIRE 2368 336 2368 320
+WIRE 2432 336 2368 336
+WIRE 2592 336 2432 336
+WIRE 1088 384 1088 320
+WIRE 1184 384 1184 320
+WIRE 1184 384 1088 384
+WIRE 1296 384 1296 304
+WIRE 1296 384 1184 384
+WIRE 1536 384 1296 384
+WIRE 1600 384 1536 384
+WIRE 1760 384 1760 352
+WIRE 1760 384 1600 384
+WIRE 1856 384 1760 384
+WIRE 1984 384 1856 384
+WIRE 2160 384 1984 384
+WIRE 2624 384 2624 352
+WIRE 2624 384 2160 384
+WIRE 2848 384 2624 384
+WIRE 2880 384 2848 384
+WIRE 2960 384 2880 384
+WIRE 3056 384 2960 384
+WIRE 3136 384 3056 384
+WIRE 3744 384 3744 160
+WIRE 3744 384 3136 384
+WIRE 3824 384 3824 304
+WIRE 3824 384 3744 384
+WIRE 3936 384 3936 320
+WIRE 3936 384 3824 384
+WIRE 4336 384 3936 384
+WIRE 4528 384 4336 384
+WIRE 1296 400 1296 384
+WIRE 2080 400 2080 320
+WIRE 2368 416 2368 336
+WIRE 2512 416 2512 304
+WIRE 2784 416 2784 320
+WIRE 3360 416 3360 304
+WIRE 3616 416 3360 416
+WIRE 3024 448 3008 448
+WIRE 3072 448 3024 448
+WIRE 2160 464 2160 384
+WIRE 2160 464 2080 464
+WIRE 2880 480 2880 384
+WIRE 2880 480 2816 480
+WIRE 1696 496 1696 240
+WIRE 1856 496 1856 448
+WIRE 1856 496 1696 496
+WIRE 1984 496 1984 448
+WIRE 1984 496 1856 496
+WIRE 2368 496 1984 496
+WIRE 2512 496 2368 496
+WIRE 2784 496 2512 496
+WIRE 3328 496 3328 192
+WIRE 3600 496 3328 496
+WIRE 2816 512 2816 480
+WIRE 2960 528 2960 384
+WIRE 3008 528 2960 528
+WIRE 3072 528 3008 528
+WIRE 3504 528 3248 528
+WIRE 3600 528 3600 496
+WIRE 3600 528 3504 528
+WIRE 2768 576 2608 576
+WIRE 2880 576 2880 560
+WIRE 2912 576 2880 576
+WIRE 2768 592 2768 576
+WIRE 3504 592 3504 528
+WIRE 2816 624 2816 592
+WIRE 2832 624 2816 624
+WIRE 2848 624 2832 624
+WIRE 1536 672 1536 384
+WIRE 2608 672 2608 656
+WIRE 2608 672 1536 672
+WIRE 2768 672 2608 672
+WIRE 3328 672 3328 640
+WIRE 3504 672 3328 672
+WIRE 3616 672 3616 416
+WIRE 3616 672 3504 672
+WIRE 3328 688 3328 672
+WIRE 3136 768 3136 384
+WIRE 3248 768 3248 624
+WIRE 3248 768 3136 768
+WIRE 3328 768 3248 768
+FLAG 1296 400 0
+FLAG 1856 224 r_in
+FLAG 2256 256 r2_in
+FLAG 2432 336 r3_in
+FLAG 1568 128 24V
+FLAG 4064 240 sig
+FLAG 3808 128 op_out
+FLAG 2784 320 out
+FLAG 2688 320 out_op
+FLAG 3328 192 in_pos
+FLAG 3360 304 in_neg
+FLAG 2832 624 pwm
+FLAG 2912 576 sin
+FLAG 3024 448 ref
+FLAG 4336 304 0V
+FLAG 4528 304 3.3V
+SYMBOL voltage 1296 208 R0
+SYMATTR InstName V3
+SYMATTR Value 12
+SYMATTR SpiceLine Rser=1
+SYMBOL ind2 3056 432 R0
+SYMATTR InstName L1
+SYMATTR Value 7m
+SYMATTR Type ind
+SYMATTR SpiceLine Rser=30
+SYMBOL ind2 3312 544 R0
+SYMATTR InstName L2
+SYMATTR Value 7m
+SYMATTR SpiceLine Rser=70
+SYMBOL res 2352 400 R0
+SYMATTR InstName R5
+SYMATTR Value 1k
+SYMBOL cap 2352 256 R0
+SYMATTR InstName C1
+SYMATTR Value 100n
+SYMBOL res 2496 160 R0
+SYMATTR InstName R6
+SYMATTR Value 2k
+SYMBOL res 2496 400 R0
+SYMATTR InstName R9
+SYMATTR Value 1k
+SYMBOL voltage 1760 256 R0
+SYMATTR InstName V4
+SYMATTR Value PULSE(0 3.3 0 10n 10n 0.05m 0.1m)
+SYMATTR SpiceLine Rser=1
+SYMBOL cap 2064 400 R0
+SYMATTR InstName C6
+SYMATTR Value 100n
+SYMBOL res 2064 208 R0
+SYMATTR InstName R14
+SYMATTR Value 470
+SYMBOL cap 1840 384 R0
+SYMATTR InstName C2
+SYMATTR Value 100n
+SYMBOL polcap 1968 384 R0
+SYMATTR InstName C3
+SYMATTR Value 500µ
+SYMBOL cap 1168 256 R0
+SYMATTR InstName C4
+SYMATTR Value 100n
+SYMBOL polcap 1072 256 R0
+SYMATTR InstName C5
+SYMATTR Value 500µ
+SYMBOL ind2 2752 576 R0
+SYMATTR InstName L3
+SYMATTR Value 7m
+SYMATTR Type ind
+SYMATTR SpiceLine Rser=30
+SYMBOL voltage 2608 560 R0
+SYMATTR InstName V1
+SYMATTR Value PULSE(0 100 0 10n 10n 0.0005m 0.0315m)
+SYMATTR SpiceLine Rser=1
+SYMBOL res 3824 0 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R12
+SYMATTR Value 8k
+SYMBOL cap 3040 320 R0
+SYMATTR InstName C7
+SYMATTR Value 100n
+SYMBOL polcap 3120 320 R0
+SYMATTR InstName C8
+SYMATTR Value 500µ
+SYMBOL res 3920 224 R0
+SYMATTR InstName R8
+SYMATTR Value 470
+SYMBOL res 3920 144 R0
+SYMATTR InstName R11
+SYMATTR Value 1k
+SYMBOL cap 3808 240 R0
+SYMATTR InstName C10
+SYMATTR Value 1n
+SYMBOL voltage 3328 672 R0
+SYMATTR InstName V2
+SYMATTR Value SINE(8 8 700 0)
+SYMATTR SpiceLine Rser=1
+SYMBOL res 2800 304 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R16
+SYMATTR Value 66
+SYMBOL voltage 3248 528 R0
+SYMATTR InstName V6
+SYMATTR Value SINE(5 5 10000 0 0 180)
+SYMATTR SpiceLine Rser=1
+SYMBOL res 3440 64 R0
+SYMATTR InstName R21
+SYMATTR Value 470
+SYMBOL res 3632 48 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R1
+SYMATTR Value 1k
+SYMBOL res 3632 160 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R7
+SYMATTR Value 1k
+SYMBOL res 3200 208 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R20
+SYMATTR Value 8k
+SYMBOL cap 3616 80 R0
+SYMATTR InstName C9
+SYMATTR Value 1n
+SYMBOL voltage 3504 576 R0
+SYMATTR InstName V5
+SYMATTR Value SINE(0 0.61 2500)
+SYMATTR SpiceLine Rser=1
+SYMBOL voltage 2960 288 R0
+SYMATTR InstName V7
+SYMATTR Value 5V
+SYMATTR SpiceLine Rser=1
+SYMBOL voltage 1600 288 R0
+SYMATTR InstName V8
+SYMATTR Value 5
+SYMATTR SpiceLine Rser=1
+SYMBOL voltage 2848 288 R0
+SYMATTR InstName V9
+SYMATTR Value 12
+SYMATTR SpiceLine Rser=1
+SYMBOL Opamps/LM358 3744 64 R0
+SYMATTR InstName U1
+SYMBOL Opamps/LM358 2624 256 R0
+SYMATTR InstName U2
+SYMBOL voltage 2880 464 R0
+SYMATTR InstName V10
+SYMATTR Value SINE(0 1.75 10000 0 0)
+SYMATTR SpiceLine Rser=1
+SYMBOL voltage 2816 496 R0
+SYMATTR InstName V11
+SYMATTR Value PULSE(-5 5 0 0.001m 0.001m 0.0000m 0.002m)
+SYMATTR SpiceLine Rser=1
+SYMBOL bv 3008 432 R0
+SYMATTR InstName B2
+SYMATTR Value V=if((V(out)-5)*0.9>V(pwm),5,-5)
+SYMBOL voltage 4336 288 R0
+SYMATTR InstName V12
+SYMATTR Value 0
+SYMATTR SpiceLine Rser=1
+SYMBOL voltage 4528 288 R0
+SYMATTR InstName V13
+SYMATTR Value 3.3
+SYMATTR SpiceLine Rser=1
+TEXT 1664 -48 Left 2 !.tran 0 2mS
+TEXT 2480 -48 Left 2 !K1 L1 L2 0.5
+TEXT 2480 16 Left 2 !K2 L3 L2 0.0
+TEXT 2448 224 Left 2 ;poti