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Is it true I need a 7448 chip if I'm using a common cathode 7 segment display?

At the moment, I have a 7447 decoder chip connected to a 7 segment display with two common ground connections on it. However, it's not working, and I read somewhere that you need a 7448 decoder chip to power a common cathode 7 segment display. Is that true?

Question by Ke-Bob    |  last reply


7 segment sed driver/decoder circuit help

Ive looked all over, and have already tried 3 circuits, but none work. They have either the wrong ic, wrong led display, etc. So, I want to make a circuit that, by using a decoder, I can flip 4 dip switches and make the display make certain numbers. I have a 7447 ic, common cathode led display, but I can only either find a circuit with a 7447 and a common anode, or a circuit with a common cathode but a different decoder (a latch/decoder/driver). Here is the first site I tried:http://www.allaboutcircuits.com/vol_6/chpt_7/9.htmlAnd when I finally flip the switches, nothing happens even though I made it exactly as shown. But it has a CMOS, so thats probably a big problem. I also tried this site:http://www.atilim.edu.tr/~hkar/lab5.htmBut it has a common anode, and when I tried it it didnt work. I have exactly ELS321HDB. And I have a power unit that can go from 5 - 18 volts. Can anyone show me how to make this? Im not too good yet at reading circuit diagrams, because I seem to make it way more complex then it should be.

Question by 101yummYYummy101    |  last reply


7 segment led display driver help?

7 segment sed driver/decoder circuit helpEMAIL FLAGIve looked all over, and have already tried 3 circuits, but none work. They have either the wrong ic, wrong led display, etc. So, I want to make a circuit that, by using a decoder, I can flip 4 dip switches and make the display make certain numbers. I have a 7447 ic, common cathode led display, but I can only either find a circuit with a 7447 and a common anode, or a circuit with a common cathode but a different decoder (a latch/decoder/driver). Here is the first site I tried:http://www.allaboutcircuits.com/vol_6/chpt_7/9.htmlAnd when I finally flip the switches, nothing happens even though I made it exactly as shown. But it has a CMOS, so thats probably a big problem. I also tried this site:http://www.atilim.edu.tr/~hkar/lab5.htmBut it has a common anode, and when I tried it it didnt work. I have exactly ELS321HDB. And I have a power unit that can go from 5 - 18 volts. Can anyone show me how to make this? Im not too good yet at reading circuit diagrams, because I seem to make it way more complex then it should be.

Question by 101yummYYummy101  


Total Views Count - 06/07/2012

Hi everyone. Here's this week's total views. Some members are working on new patch designs for the new patches I'll be handing out for comments, subscribers, number of instructables, forum topics, answers and subscriptions soon. I just moved house and I've not got a desk yet so I've not had anywhere to sit and code nor time to hand out patches manually yet. If someone wants to go through the list below and send me a list of who's owed what patch, I'll make the time to go through and send them manually before next week. Interestingly, most of the top members all have slightly less views this week compared to last week. Perhaps everyone was too busy partying on the 4th to visit Instructables? James User 29/06/2012 06/07/2012 Gain scoochmaroo 9567558 9670028 102470 canida 6621699 6657519 35820 fungus+amungus 5685979 5711630 25651 randofo 5143862 5212765 68903 jessyratfink 3620957 3657557 36600 Honus 3458226 3467797 9571 Kiteman 2581067 2588854 7787 Plasmana 2514783 2523009 8226 ChrysN 2136749 2158326 21577 Tool+Using+Animal 2091376 2099302 7926 Creativeman 1692508 1703660 11152 chr 1596307 1604709 8402 drinkmorecoffee 1593703 1600881 7178 mikeasaurus 1575847 1595317 19470 killerjackalope 1472077 1476643 4566 T3h_Muffinator 1413828 1416754 2926 zieak 1398999 1402150 3151 frenzy 1337871 1345887 8016 Weissensteinburg 1294102 1299736 5634 gmjhowe 1284167 1286808 2641 lemonie 1279085 1284224 5139 Frivolous+Engineering 1114063 1116051 1988 mikey77 972831 977033 4202 shesparticular 956215 960542 4327 Brennn10 927382 930316 2934 jeff-o 878857 882726 3869 scraptopower 858851 863400 4549 aeray 827428 832771 5343 CameronSS 814041 819310 5269 ModMischief 812563 816737 4174 Mrballeng 795980 802042 6062 laxap 770365 772728 2363 PKM 767407 769876 2469 depotdevoid 728446 730992 2546 starshipminivan 712786 719764 6978 belsey 704966 708406 3440 Jayefuu 673240 675497 2257 Gadget+Gangster 572045 578108 6063 BrittLiv 513120 519667 6547 AngryRedhead 507339 510068 2729 rimar2000 464651 467598 2947 vishalapr 377804 379242 1438 mary+candy 374995 376987 1992 Spl1nt3rC3ll 370582 371993 1411 Vyger 337019 338451 1432 KentsOkay 336442 337402 960 rickharris 334730 336311 1581 Greasetattoo 328371 332179 3808 Ninzerbean 319005 320479 1474 scooter76 319026 319445 419 Lithium+Rain 303928 306884 2956 sunshiine 291077 295675 4598 Xellers 288559 289671 1112 Computothought 283145 287153 4008 Technochicken 278577 280037 1460 AndyGadget 272312 273556 1244 knife141 270139 271969 1830 bajablue 258017 261325 3308 justjonty 251153 252368 1215 Hiyadudez 238477 239600 1123 iminthebathroom 237193 238070 877 bertus52x11 234463 235409 946 annahowardshaw 232643 234606 1963 dark+sponge 232768 233209 441 bongodrummer 231208 231917 709 janw 228242 229114 872 JamesRPatrick 223846 224908 1062 comodore 214394 215037 643 craftknowitall 205863 213154 7291 jen7714 208729 210778 2049 thermoelectric 208630 210304 1674 Nelson_Yepez 208884 210075 1191 Lynne+Bruning 208630 209488 858 Kaelessin 207054 207796 742 yokozuna 202540 203165 625 coolbeansbaby68 200495 201631 1136 Dr.Paj 194094 194730 636 RavingMadStudios 193219 194074 855 Jimmy+Proton 164480 166863 2383 ynze 165097 165813 716 WYE_Lance 150909 155400 4491 lw119 148871 151325 2454 I_am_Canadian 150398 150869 471 The+Jamalam 150349 150696 347 DJ+Radio 145970 146834 864 HHarry 142220 144129 1909 marc.cryan 142650 143403 753 wizgirl 139776 140744 968 Goodhart 137068 137479 411 susanrm 131415 133342 1927 Mr.Sanchez 128623 129250 627 The+Papier+Boy 128106 128630 524 Killer%7ESafeCracker 121084 123033 1949 MichelMoermans 113418 114003 585 Biggsy 109910 110807 897 dombeef 103515 103982 467 cammers 100327 101116 789 blinkyblinky 97936 99019 1083 mman1506 98410 98914 504 fjordcarver 97479 98243 764 KoffeeKommando 90204 90748 544 Shadowman39 85852 86281 429 beanieostrich 82496 83242 746 Re-design 82271 82631 360 LargeMouthBass 81544 82285 741 agis68 81661 81963 302 monsterlego 76941 78870 1929 The+Ideanator 75713 76100 387 ajleece 73052 73266 214 kelseymh 70359 70703 344 diyoutdoorsman 69591 70243 652 cdawisconsin 68960 69574 614 TabbyDeAnne 68104 68745 641 TitanTechRobotics 67631 68166 535 Winged+Fist 66989 68032 1043 arthurb 67655 67816 161 Sunkicked 64905 65232 327 coolpizzadude 64463 64900 437 EmmettO 64521 64758 237 Win+Guy 62472 62930 458 mkanoap 61649 61890 241 jwystup 60044 60273 229 Berkin 58258 58717 459 lizzyastro 56617 57181 564 nickodemus 54764 55093 329 knuckel 54547 54746 199 iceng 53457 53979 522 TSC 51083 51359 276 kcls 50132 50432 300 cbm104 49827 50199 372 ahrshin 49392 49588 196 Z.Backas 49322 49556 234 Mimikry 49121 49553 432 ilpug 47601 48274 673 krysteanuh 47917 48255 338 lilyfrancis 47834 47933 99 MotaBoi 44660 44822 162 patriots8888 44425 44628 203 tqwerty 44185 44565 380 steveastrouk 43915 44212 297 Rob+O 43577 43870 293 possum888 42820 43071 251 Bot1398 41279 42176 897 razvan_iycdi 40767 41177 410 zack247 40589 40998 409 drknotter 40666 40991 325 Tornado96 40016 40385 369 splazem 39854 40216 362 Data643 39509 39653 144 qazwsx755 38801 39263 462 shadowninja31 36365 36487 122 lil+larry 35373 35757 384 Derin 35260 35453 193 peguiono 34900 35004 104 Sorunome 33889 34825 936 canucksgirl 33855 34670 815 plane+phanatic 33230 33380 150 CrayfishYAY 30825 30893 68 zurichko 30614 30826 212 Dr.+Pepper 29439 29598 159 m6233555m 28900 28963 63 Knex_Gun_Builder 28760 28813 53 Twinmum 28265 28514 249 fdmjh 27917 28052 135 Legofanatic 27225 27398 173 nutsandbolts_64 27092 27358 266 aeronut01 27079 27198 119 poofrabbit 26419 27190 771 colorex 25459 25696 237 floris2burn 25186 25290 104 mJusticz 24752 25146 394 Tom+Buckey 24768 24905 137 Nostalgic+Guy 23344 23489 145 mistyp 22931 23289 358 RollerScrapper 22220 22499 279 zascecs 22268 22327 59 robot1398 21870 22142 272 knexinventer 21895 22071 176 acidbass 21648 21869 221 username252 20458 20642 184 A-Nony-Mus 20254 20441 187 knexsuperbuilderfreak 19012 19048 36 bricabracwizard 18131 18315 184 Zaphod+Beetlebrox 15411 17969 2558 Football+viking+boy 16244 16432 188 LoneWolf 15541 15664 123 masterochicken 15543 15613 70 iproberry1 14393 15501 1108 Kryptonite 15035 15199 164 Super_Nerd 14711 14999 288 RNB 14076 14214 138 NatNoBrains 13981 14104 123 Mahmoud+Alaa 13067 13740 673 FrozenStar 13588 13654 66 NachoMahma 12887 12901 14 king1000 12811 12873 62 moocowdog 12181 12254 73 cherishcherub 12036 12074 38 furrysalamander 11404 11673 269 slithien 11239 11326 87 TheMacyC 10875 11095 220 Kaptain+Kool 10642 10761 119 35Timmy 9326 9487 161 wareneutron 8860 8966 106 tech+dawg 8360 8677 317 tbcross 7756 7807 51 thegeeke 7463 7638 175 Randomguy65 7371 7447 76 ElvenChild 7077 7121 44 happyjo 6838 6878 40 MegaMetal8 6578 6615 37 emilyvanleemput 5385 6334 949 jamesdude 6144 6156 12 solarblade90 6083 6119 36 BladeFyre+Studios 5857 5882 25 Jag56 5716 5783 67 nfk11 5585 5608 23 TheAwesomestDude 5078 5134 56 9400dk 4990 5009 19 White+Shadow 4726 4852 126 mg0930mg 4713 4724 11 rockhardmj 4098 4665 567 neuropol 4488 4543 55 iApple+guy 4211 4306 95 AwesomeSwordGuy 4128 4166 38 shadon 3674 3701 27 LivStoleYourPie 3377 3418 41 cj81499 3062 3068 6 gmxx 3043 3055 12 BLUEBLOBS2 2845 2986 141 cyanyears 2905 2927 22 PotatoCoffee 2613 2708 95 Black+Panther+Knex 2203 2259 56 vicvelcro 2131 2173 42 Mutantflame 2119 2121 2 j.g.kuster 1980 2057 77 The+Chunky+Sniper%21 1677 1716 39 FastLearner 1566 1575 9 daredevil499 1434 1470 36 kyleslab 1027 1040 13 Jeff+Kallaus 1023 1031 8 protolabs 956 1010 54 CeruleanPhoenix 763 783 20 Alexvolos1 594 600 6 Fr-Pa-Co 475 479 4 %28YOUR+N 263 263 0 heratio 246 247 1 schumi23 95 111 16 lightingever 13 13 0

Topic by Jayefuu    |  last reply


Total Views Count - 13/07/2012

Here's this week's total views count. To get on the list and have your stats monitored each week and get patches, join the group. If you joined since last week's run, you won't be on the list yet since the script to update the database with members isn't working yet. I hope to get it fixed this weekend. I also need a new name for the group. Over the next week I will be able to automatically hand out patches every day for Total Views, Comments, Forum Topics, Number of Instructables, Number of Followers, Number Following, Answers and Best Answers. With this in mind my weekly forum topic every friday will contain: 1) A list welcoming all the new members that have joined that week 2) A list of who's been awarded what patch that week so we can see each other achieve important milestones 3) A list of links to lists like the one below, one list for each type of stat so that you can compare your progress to your friends. So I need a new name for the group to reflect these changes, since total views count no longer reflects what the group will do. Please make suggestions in the comments below. I'll try think of a good prize for the best suggestion. Name 06/07/2012 13/07/2012 Gain scoochmaroo 9670028 9780763 110735 canida 6657519 6706656 49137 fungus+amungus 5711630 5739708 28078 randofo 5212765 5305827 93062 jessyratfink 3657557 3702111 44554 Honus 3467797 3481038 13241 Kiteman 2588854 2602215 13361 Plasmana 2523009 2536885 13876 ChrysN 2158326 2199126 40800 Tool+Using+Animal 2099302 2107207 7905 Creativeman 1703660 1718972 15312 chr 1604709 1618374 13665 mikeasaurus 1595317 1612513 17196 drinkmorecoffee 1600881 1611043 10162 killerjackalope 1476643 1483563 6920 T3h_Muffinator 1416754 1420324 3570 zieak 1402150 1406908 4758 frenzy 1345887 1359279 13392 Weissensteinburg 1299736 1308074 8338 lemonie 1284224 1292907 8683 gmjhowe 1286808 1290927 4119 Frivolous+Engineering 1116051 1120587 4536 mikey77 977033 983520 6487 shesparticular 960542 965491 4949 Brennn10 930316 934557 4241 jeff-o 882726 886316 3590 scraptopower 863400 871913 8513 aeray 832771 840486 7715 ModMischief 816737 839633 22896 CameronSS 819310 826843 7533 Mrballeng 802042 810189 8147 laxap 772728 776182 3454 PKM 769876 773106 3230 depotdevoid 730992 734582 3590 starshipminivan 719764 728662 8898 belsey 708406 712952 4546 Jayefuu 675497 678700 3203 Gadget+Gangster 578108 583818 5710 BrittLiv 519667 523924 4257 AngryRedhead 510068 514191 4123 rimar2000 467598 471365 3767 vishalapr 379242 381291 2049 mary+candy 376987 381173 4186 Spl1nt3rC3ll 371993 374129 2136 Vyger 338451 341008 2557 KentsOkay 337402 338918 1516 rickharris 336311 338448 2137 Greasetattoo 332179 336510 4331 Ninzerbean 320479 322947 2468 scooter76 319445 319942 497 Lithium+Rain 306884 309833 2949 sunshiine 295675 304019 8344 Computothought 287153 292608 5455 Xellers 289671 291758 2087 Technochicken 280037 281994 1957 AndyGadget 273556 275928 2372 knife141 271969 275094 3125 bajablue 261325 265307 3982 justjonty 252368 254643 2275 Hiyadudez 239600 241342 1742 iminthebathroom 238070 239295 1225 annahowardshaw 234606 237374 2768 bertus52x11 235409 236751 1342 dark+sponge 233209 233704 495 bongodrummer 231917 232747 830 janw 229114 230331 1217 JamesRPatrick 224908 226068 1160 craftknowitall 213154 222933 9779 comodore 215037 215824 787 jen7714 210778 213892 3114 thermoelectric 210304 212936 2632 Nelson_Yepez 210075 211814 1739 Lynne+Bruning 209488 210373 885 Kaelessin 207796 208656 860 yokozuna 203165 204006 841 coolbeansbaby68 201631 203096 1465 Dr.Paj 194730 195680 950 RavingMadStudios 194074 195350 1276 Jimmy+Proton 166863 169220 2357 ynze 165813 166710 897 WYE_Lance 155400 159877 4477 lw119 151325 153304 1979 I_am_Canadian 150869 151526 657 The+Jamalam 150696 151100 404 DJ+Radio 146834 147716 882 HHarry 144129 146563 2434 marc.cryan 143403 144468 1065 wizgirl 140744 142242 1498 Goodhart 137479 138060 581 susanrm 133342 136072 2730 Mr.Sanchez 129250 130069 819 The+Papier+Boy 128630 129266 636 Killer%7ESafeCracker 123033 124578 1545 MichelMoermans 114003 114807 804 Biggsy 110807 112072 1265 dombeef 103982 104605 623 cammers 101116 102296 1180 blinkyblinky 99019 100791 1772 fjordcarver 98243 100227 1984 mman1506 98914 99678 764 KoffeeKommando 90748 91589 841 Shadowman39 86281 86947 666 beanieostrich 83242 84366 1124 LargeMouthBass 82285 83338 1053 Re-design 82631 83167 536 agis68 81963 82443 480 monsterlego 78870 82414 3544 The+Ideanator 76100 76498 398 ajleece 73266 73525 259 kelseymh 70703 71209 506 diyoutdoorsman 70243 71028 785 cdawisconsin 69574 70433 859 TabbyDeAnne 68745 69494 749 Winged+Fist 68032 68979 947 TitanTechRobotics 68166 68842 676 arthurb 67816 68060 244 Sunkicked 65232 65584 352 coolpizzadude 64900 65444 544 EmmettO 64758 65053 295 Win+Guy 62930 63430 500 mkanoap 61890 62698 808 jwystup 60273 60603 330 Berkin 58717 59236 519 lizzyastro 57181 58078 897 nickodemus 55093 55492 399 knuckel 54746 55093 347 iceng 53979 54763 784 TSC 51359 51718 359 kcls 50432 50802 370 cbm104 50199 50718 519 Mimikry 49553 50166 613 ahrshin 49588 49917 329 Z.Backas 49556 49782 226 ilpug 48274 49252 978 krysteanuh 48255 48675 420 lilyfrancis 47933 48083 150 MotaBoi 44822 45081 259 tqwerty 44565 45046 481 steveastrouk 44212 44967 755 patriots8888 44628 44927 299 razvan_iycdi 41177 44260 3083 Rob+O 43870 44210 340 Bot1398 42176 43498 1322 possum888 43071 43387 316 zack247 40998 41542 544 drknotter 40991 41476 485 splazem 40216 40911 695 Tornado96 40385 40873 488 qazwsx755 39263 39923 660 Data643 39653 39894 241 shadowninja31 36487 36616 129 lil+larry 35757 36171 414 canucksgirl 34670 35757 1087 Derin 35453 35717 264 Sorunome 34825 35616 791 peguiono 35004 35140 136 plane+phanatic 33380 33545 165 zurichko 30826 31116 290 CrayfishYAY 30893 30987 94 Dr.+Pepper 29598 29766 168 m6233555m 28963 29012 49 Knex_Gun_Builder 28813 28909 96 Twinmum 28514 28840 326 fdmjh 28052 28255 203 poofrabbit 27190 28197 1007 nutsandbolts_64 27358 27694 336 Legofanatic 27398 27682 284 aeronut01 27198 27435 237 colorex 25696 26152 456 mJusticz 25146 25643 497 floris2burn 25290 25376 86 Tom+Buckey 24905 25027 122 Zaphod+Beetlebrox 17969 24467 6498 mistyp 23289 23711 422 Nostalgic+Guy 23489 23608 119 RollerScrapper 22499 22906 407 robot1398 22142 22594 452 zascecs 22327 22410 83 knexinventer 22071 22380 309 acidbass 21869 22119 250 username252 20642 20882 240 A-Nony-Mus 20441 20727 286 knexsuperbuilderfreak 19048 19104 56 bricabracwizard 18315 18577 262 Football+viking+boy 16432 16655 223 iproberry1 15501 16456 955 LoneWolf 15664 15886 222 masterochicken 15613 15685 72 Kryptonite 15199 15450 251 Super_Nerd 14999 15437 438 Mahmoud+Alaa 13740 14629 889 RNB 14214 14350 136 NatNoBrains 14104 14251 147 FrozenStar 13654 13819 165 king1000 12873 12963 90 NachoMahma 12901 12919 18 moocowdog 12254 12362 108 cherishcherub 12074 12118 44 furrysalamander 11673 11865 192 slithien 11326 11447 121 TheMacyC 11095 11366 271 Kaptain+Kool 10761 10927 166 35Timmy 9487 9697 210 wareneutron 8966 9119 153 tech+dawg 8677 9047 370 thegeeke 7638 7900 262 tbcross 7807 7878 71 Randomguy65 7447 7568 121 ElvenChild 7121 7200 79 emilyvanleemput 6334 6975 641 happyjo 6878 6927 49 MegaMetal8 6615 6666 51 jamesdude 6156 6185 29 solarblade90 6119 6176 57 BladeFyre+Studios 5882 5918 36 Jag56 5783 5838 55 nfk11 5608 5660 52 TheAwesomestDude 5134 5226 92 9400dk 5009 5018 9 White+Shadow 4852 4992 140 rockhardmj 4665 4889 224 BLUEBLOBS2 2986 4785 1799 mg0930mg 4724 4741 17 neuropol 4543 4612 69 iApple+guy 4306 4398 92 AwesomeSwordGuy 4166 4204 38 shadon 3701 3727 26 LivStoleYourPie 3418 3475 57 cj81499 3068 3073 5 cyanyears 2927 2953 26 gmxx 3055 2843 -212 PotatoCoffee 2708 2806 98 Black+Panther+Knex 2259 2280 21 vicvelcro 2173 2193 20 Mutantflame 2121 2123 2 j.g.kuster 2057 2104 47 The+Chunky+Sniper%21 1716 1756 40 FastLearner 1575 1596 21 daredevil499 1470 1516 46 protolabs 1010 1100 90 kyleslab 1040 1057 17 Jeff+Kallaus 1031 1037 6 CeruleanPhoenix 783 804 21 Alexvolos1 600 607 7 Fr-Pa-Co 479 479 0 %28YOUR+N 263 267 4 heratio 247 247 0 schumi23 111 125 14 lightingever 13 14 1

Topic by Jayefuu    |  last reply