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TRN NGC TR - DHDT1 - 05031811. Mch m t 0 n 5 dng IC 4510(counter) v IC 4511 (giim BCD sang LED 7 on)

S nguyn l:

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Ngun dng cung cp cho mch l ngun mt chiu 9VIC 555 dng to mch a hi phi n dng to xung vung dng cho b

m. Trong phn to xung dng IC555, chn ngng 6 c ni vi chnny s 2 nn hai chn ny c chung in p l t C. Khi nhn nt goIC555 c Reset li . Chn 7 x in c ni vo gia hai in tr 1K tong x in cho t. Chn 3 l chn tn hiu ra xung vung. Do thi giannp v x ca t khng bng nhau nn tn hiu ra l xung vung cng khngi xng.IC 4510 l IC m nh phn 4 bit h CMOS tch cc cnh ln :Bng chn tr

Khi ng ra DCBA l 0110 th Reset li trng thi u DCBA-0000. Do mcch ch m t 0 n 5 nn y chng ta khng cn dng chn s 2( ng

pulses output D output C output B output A

0 0 0 0 0

1 0 0 0 1

2 0 0 1 0

3 0 0 1 1

4 0 1 0 0

5 0 1 0 1

6 0 1 1 0

7 0 1 1 18 1 0 0 0

9 1 0 0 1

10 0 0 0 0

11 0 0 0 1

: : : : :

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vi D). Chn 11(B) v chn 14(C) c ni ln lt vi hai diot 1N4148c ni vi ngun qua in tr 10K v ni vi chn nh Reset 9 hnh ctc dng nh mt cng AND hai ng vi u ra c ni vi chn Reset.Khi m n 6, cc chn ra DCBA ng vi 0110 th hai ng vo cng ANDu mc cao nn ng ra cng mc cao tc ng vo chn Reset lm ICtr li trng thi u. Trng thi 0110 ng vi thp phn l 6 khng chin th trn LED v thi gian Reset ca IC l rt ngn. IC 4510 hotng c, ng vo cho php ( chn 6) lun mc thpIC 4511 l b gii m BCD sang Led 7 onBng chn tr:

BCD inputs segment outputs

displayD C B A a b c d e f g

0 0 0 0 1 1 1 1 1 1 0

0 0 0 1 0 1 1 0 0 0 0

0 0 1 0 1 1 0 1 1 0 1

0 0 1 1 1 1 1 1 0 0 1

0 1 0 0 0 1 1 0 0 1 1

0 1 0 1 1 0 1 1 0 1 1

0 1 1 0 0 0 1 1 1 1 1

0 1 1 1 1 1 1 0 0 0 0

1 0 0 0 1 1 1 1 1 1 1

1 0 0 1 1 1 1 0 0 1 1

Do ta ch m t 0 n 5 nn ng vo D ng vi chn 6 lun c ni mt.Ng vo ABC c ni vi cc ng ra ABC tng ng ca IC 4510. Ngvo cho php ( enable input) lun c gi mc thp IC c th hot

ng. Cc ng ra c ni tng ng vi cc chn ca LED 7 on loiCathod chung.Tuy nhin cho vic chuyn trng thi c thc hin tt hn chng ta cth mc thm cc cng NOR ni tip vi 1 diot nh hnh v vi u vo lcc chn ABC, u ra c ni vi u vo B( chn 1) ca 4511.

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