Simulation (was "How to count pulses per second.)

I don't have a counter in my library so I built a 4-bit ripple
counter out of D flops and decoded "10".

See how it works by changing the period and width of the pulses
coming out of V3.


Version 4
SHEET 1 2940 836
WIRE 1136 -336 896 -336
WIRE 1568 -336 1312 -336
WIRE 2000 -336 1744 -336
WIRE 2448 -336 2192 -336
WIRE 1008 -304 736 -304
WIRE 1440 -304 1008 -304
WIRE 1872 -304 1440 -304
WIRE 2320 -304 1872 -304
WIRE 1008 -256 1008 -304
WIRE 1440 -256 1440 -304
WIRE 1872 -256 1872 -304
WIRE 2320 -256 2320 -304
WIRE 896 -208 896 -336
WIRE 928 -208 896 -208
WIRE 1312 -208 1312 -336
WIRE 1360 -208 1312 -208
WIRE 1552 -208 1520 -208
WIRE 1744 -208 1744 -336
WIRE 1792 -208 1744 -208
WIRE 2192 -208 2192 -336
WIRE 2240 -208 2192 -208
WIRE 2432 -208 2400 -208
WIRE 928 -160 896 -160
WIRE 1120 -160 1104 -160
WIRE 1136 -160 1136 -336
WIRE 1136 -160 1120 -160
WIRE 1360 -160 1136 -160
WIRE 1568 -160 1568 -336
WIRE 1568 -160 1536 -160
WIRE 1792 -160 1568 -160
WIRE 1984 -160 1968 -160
WIRE 2000 -160 2000 -336
WIRE 2000 -160 1984 -160
WIRE 2240 -160 2000 -160
WIRE 2448 -160 2448 -336
WIRE 2448 -160 2416 -160
WIRE 1008 -64 1008 -112
WIRE 1440 -64 1440 -112
WIRE 1440 -64 1008 -64
WIRE 1872 -64 1872 -112
WIRE 1872 -64 1440 -64
WIRE 1920 -64 1872 -64
WIRE 2320 -64 2320 -112
WIRE 2320 -64 1920 -64
WIRE 1552 -48 1552 -208
WIRE 1552 -48 1136 -48
WIRE 1984 -32 1984 -160
WIRE 1984 -32 1168 -32
WIRE 2432 -16 2432 -208
WIRE 2432 -16 1184 -16
WIRE 1120 16 1120 -160
WIRE 1136 16 1136 -48
WIRE 1168 16 1168 -32
WIRE 1184 16 1184 -16
WIRE 1744 64 1328 64
WIRE 1856 64 1808 64
WIRE 1136 128 1136 80
WIRE 1216 128 1136 128
WIRE 1328 128 1328 64
WIRE 1328 128 1280 128
WIRE 1376 128 1328 128
WIRE 1504 128 1456 128
WIRE 800 160 800 128
WIRE 896 160 896 -160
WIRE 2464 240 2464 208
WIRE 736 288 736 -304
WIRE 800 288 800 240
WIRE 800 288 736 288
WIRE 896 288 896 240
WIRE 896 288 800 288
WIRE 1216 288 896 288
WIRE 1616 288 1616 256
WIRE 1616 288 1440 288
WIRE 2016 288 1952 288
WIRE 2272 288 2272 208
WIRE 2272 288 2240 288
WIRE 1616 320 1616 288
WIRE 1952 320 1952 288
WIRE 1136 352 1136 128
WIRE 1216 352 1136 352
WIRE 1520 352 1440 352
WIRE 2016 352 1984 352
WIRE 2400 352 2240 352
WIRE 2464 352 2464 320
WIRE 2464 352 2400 352
WIRE 1728 368 1728 336
WIRE 2464 400 2464 352
WIRE 736 416 736 288
WIRE 848 416 736 416
WIRE 976 416 912 416
WIRE 1216 416 1056 416
WIRE 1520 416 1520 352
WIRE 1520 416 1440 416
WIRE 1920 416 1920 -64
WIRE 2016 416 1920 416
WIRE 2288 416 2240 416
WIRE 2400 416 2400 352
WIRE 1520 448 1520 416
WIRE 1616 448 1616 400
WIRE 1616 448 1520 448
WIRE 1216 480 1200 480
WIRE 1616 480 1616 448
WIRE 1728 480 1728 448
WIRE 1760 480 1728 480
WIRE 1856 480 1856 64
WIRE 1856 480 1824 480
WIRE 2016 480 1856 480
WIRE 1520 528 1520 448
WIRE 2288 528 2288 416
WIRE 2400 528 2400 480
WIRE 2400 528 2288 528
WIRE 2464 528 2464 480
WIRE 2464 528 2400 528
WIRE 1136 576 1136 352
WIRE 1296 576 1136 576
WIRE 1456 576 1376 576
WIRE 1728 576 1728 480
WIRE 1984 576 1984 352
WIRE 2288 576 2288 528
WIRE 2288 576 1984 576
WIRE 2288 608 2288 576
WIRE 736 688 736 416
WIRE 1520 688 1520 624
WIRE 1520 688 736 688
WIRE 1616 688 1616 544
WIRE 1616 688 1520 688
WIRE 1728 688 1728 640
WIRE 1728 688 1616 688
WIRE 2288 688 2288 672
WIRE 2288 688 1728 688
WIRE 736 720 736 688
FLAG 800 128 VCC
FLAG 736 720 0
FLAG 1616 256 VCC
FLAG 2464 208 VCC
FLAG 1200 480 VCC
FLAG 1952 320 0
FLAG 2272 208 VCC
FLAG 1728 336 VCC
FLAG 1504 128 VCC
SYMBOL Digital\\dflop 1008 -256 R0
SYMATTR InstName A2
SYMATTR SpiceLine trise 20e-9 tfall 20e-9 Td 60e-9 vhigh 5v
SYMBOL voltage 896 144 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0 5 0 1E-6 1e-6 10e-3 .1)
SYMATTR InstName V3
SYMBOL Digital\\and 1216 48 R90
SYMATTR InstName A6
SYMATTR SpiceLine trise 22e-9 tfall 22e-9 Td 33e-9 vhigh 5v
SYMBOL Misc\\NE555 1328 384 R0
SYMATTR InstName U1
SYMBOL voltage 800 144 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0 5 .001)
SYMATTR InstName V2
SYMBOL res 1600 304 R0
SYMATTR InstName R2
SYMATTR Value 1e6
SYMBOL cap 1600 480 R0
SYMATTR InstName C1
SYMATTR Value 1.1e-6
SYMBOL pnp 1456 624 M180
WINDOW 0 58 35 Left 0
WINDOW 3 52 64 Left 0
SYMATTR InstName Q1
SYMATTR Value 2N3906
SYMBOL res 1280 592 R270
WINDOW 0 -36 52 VTop 0
WINDOW 3 -39 49 VBottom 0
SYMATTR InstName R3
SYMATTR Value 1000
SYMBOL Misc\\NE555 2128 384 R0
SYMATTR InstName U2
SYMBOL res 2480 496 R180
WINDOW 0 -45 76 Left 0
WINDOW 3 -64 32 Left 0
SYMATTR InstName R1
SYMATTR Value 1.45e6
SYMBOL res 2480 336 R180
WINDOW 0 -45 69 Left 0
WINDOW 3 -60 31 Left 0
SYMATTR InstName R4
SYMATTR Value 1000
SYMBOL cap 2272 608 R0
SYMATTR InstName C2
SYMATTR Value 1e-6
SYMBOL res 1072 400 R90
WINDOW 0 -45 51 VBottom 0
WINDOW 3 -40 53 VTop 0
SYMATTR InstName R6
SYMATTR Value 82
SYMBOL diode 2384 416 R0
WINDOW 0 -47 32 Left 0
WINDOW 3 -74 67 Left 0
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL LED 912 400 R90
WINDOW 0 -48 24 VBottom 0
WINDOW 3 -44 25 VTop 0
SYMATTR InstName D1
SYMATTR Value NSPW500BS
SYMBOL Digital\\dflop 1440 -256 R0
SYMATTR InstName A1
SYMATTR SpiceLine trise 20e-9 tfall 20e-9 Td 60e-9 vhigh 5v
SYMBOL Digital\\dflop 1872 -256 R0
SYMATTR InstName A3
SYMATTR SpiceLine trise 20e-9 tfall 20e-9 Td 60e-9 vhigh 5v
SYMBOL Digital\\dflop 2320 -256 R0
SYMATTR InstName A4
SYMATTR SpiceLine trise 20e-9 tfall 20e-9 Td 60e-9 vhigh 5v
SYMBOL cap 1712 576 R0
WINDOW 0 42 34 Left 0
SYMATTR InstName C3
SYMATTR Value 100e-9
SYMBOL res 1712 352 R0
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL diode 1824 464 R90
WINDOW 0 61 32 VBottom 0
WINDOW 3 60 32 VTop 0
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL diode 1808 48 R90
WINDOW 0 67 32 VBottom 0
WINDOW 3 73 32 VTop 0
SYMATTR InstName D4
SYMATTR Value 1N4148
SYMBOL cap 1280 112 R90
WINDOW 0 71 32 VBottom 0
WINDOW 3 67 35 VTop 0
SYMATTR InstName C4
SYMATTR Value .01e-6
SYMBOL res 1472 112 R90
WINDOW 0 69 65 VBottom 0
WINDOW 3 71 69 VTop 0
SYMATTR InstName R7
SYMATTR Value 10k
TEXT 752 632 Left 0 !.tran 10
TEXT 744 664 Left 0 !.option noopiter

 

<snip>

What software is needed? Design Architect?
http://www.mentor.com/products/pcb/boardstation/system_design/design_architect/index.cfm

-- Mark