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Digital Counter using CD4026


By Radu Motisan Posted on December 22nd, 2011 , 1177 Views (Rate 2.26)



  




I needed a fast digital counter so I built one using 6 CD4026 ICs and 6 seven digit displays for a 0..999,999 display.

Here is a test video showing the counter at work, first at 200 impulses per second, then at 30000 impulses for second (30KHz). For signal generator I used a simple 555 circuit. To change the frequency to 30KHz I removed a higher capacity capacitor, leaving a smaller rated one.

A few pictures with the circuit itself:

The schematics I used (very straight forward):

Component Datasheets:
4026BE
els-515






  

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18 Responses to “Digital Counter using CD4026”

  1. 1
    lorik199:

    Salut,
    Crezi ca s-ar putea adapta un afisor VFD la acest proiect?
    Ar arata cu siguranta mult mai interesant si ar da o noua utilizare vechilor VFD-uri…

  2. 2
    Radu Motisan:

    CD4026-le e bun ca numarator in baza 10, si pentru legatura cu urmatorul CD4026 (incrementarea unitatii urmatoare), are conexiuni directe pentru a,b,c,d,e,f,g-ul afisajului cu 7 segmente. Cu alte cuvinte CD4026 produce toate combinatiile necesare afisajului cu 7 segmente pentru a desena cifrele suportate.

    Deci sigur partea de numarator in baza 10 s-ar putea folosi in scopul propus de tine, in schimb nu stiu ce interfata necesita un VFD pentru a desena cifrele.

  3. 3
    lorik199:

    Am verificat VFD-ul, e ceva destul de complex de comandat, are 9 digiti, toate segmentele sunt legate in paralel si fiecare anod are conexiune separata, deci intr-un cuvand multiplexare la greu
    Cred ca numai un uC l-ar putea comanda sau un circuit spectial

  4. 4
    Radu:

    dar tot asa e si afisajul cu 7 segmente care l-am folosit!
    Vezi datasheetul pentru ELS-515 postat aici:
    http://www.pocketmagic.net/wp-content/uploads/2011/12/els-515.pdf

    La acest afisaj , catodul (ledurilor) e comun.

  5. 5
    Radu:

    Pune o poza cu VFD-ul tau

  6. 6
    lorik199:

    In postul anterior an facut o greseala grilele pentru fiecare segment au conexiune separata
    Ideea e ca nu prea vad cum ar putea fi folosit in proiectul prezentat de tine.
    Uite aici o poza cu afisorul meu, nu prea reusita dar se intelege…
    http://postimage.org/image/4ixzx0k3f/

  7. 7
    Radu:

    Frumos afisaj, merita sa il faci functional. 19 Pini si 9 cifre? Ce model e, ai gasit vreo informatie despre el?

  8. 8
    lorik199:

    Da, 19 pini si 9 cifre
    E Futaba, pe o eticheta de pe spate scrie 9-ST-11 si dedesupt 8F(ștampilat) dar pe el e marcat totusi 9-ST-10
    Nu am gasit nimic pe internet despre el din pacate…
    Ar fi interesant de facut un frecvențmetru cu el, de buzunar, cu ceva uC SMD, dat fiind si dimensiunea lui mica(fix cat 3 monede de 10 bani una langa alta) ce ma duce cu gandul ca a functionat intr-un calculator de buzunar
    Mai in josul link-ului urmator este un display aproape identic cu al meu.
    http://www.vintagecalculators.com/html/calculator_displays.html

  9. 9
    lorik199:

    Mai am inca unul, mai mic, sub forma de lampa, tot cu 19 pini si 9 cifre, acela e si mai interesant
    E aproape identic cu cel de mai jos, cu exceptia pinilor care sunt toti dispusi intr-un capat
    http://ferretronix.com/tech/vfd/lloyds_vfd_calculator_60.jpg

  10. 10
    mijael:

    Good night. have on hand the electronic diagram of the NE555 oscillator 200 to 30000 pulses per second? thanks

  11. 11
    Radu Motisan:

    @mijael: here is an example: http://www.pocketmagic.net/wp-content/uploads/2009/07/555.jpg

    you don’t need the IRFP640, nor the flyback transformer, collect the signal after the totem pole (after the two PNP+NPN transistors ).

  12. 12
    mijael:

    thanks
    I just saw the picture attached, I simulated livewire, as I can do to send the reference image I have simulated? an email?

  13. 13
    Radu Motisan:

    You can upload it to tinypic.com and post it as comment

  14. 14
    mijael:

    http://tinypic.com/view.php?pic=2qs5mk4&s=6

  15. 15
    DIY/Homemade Geiger Counter -3- « PocketMagic:

    [...] was able to successfully connect it to my CD4026 digital counter , as seen in the video. It works great as a counter showing the individual [...]

  16. 16
    DIY/Homemade Geiger Muller Clicker V3.0 « PocketMagic:

    [...] was able to successfully connect it to my CD4026 digital counter , as seen in the video. It works great as a counter showing the individual [...]

  17. 17
    Cosmin:

    Radu, am o intrebare: daca vreau sa fac un numarator cu 4 afisaje, in loc de 6, cum ar trebui sa continui dupa al doilea integrat din dreapta? Exact ca blocul 2, dar fara butonul de reset? O schema mai explicita m-ar ajuta daca ai. :)

  18. 18
    Radu:

    Salut Cosmin,

    E mai simplu decat pare, dar din pacate nu am o alta schema, numai daca nu desenez una repede de mana, dar cu atatea conexiuni ar arata cam rau.

    Trebuie sa faci in felul urmator:
    - pornesti cu 4026-ul pt cea mai din dreapta cifra, sa il numim CI1
    - pinul :10 al lui CI1, trebuie sa mearga la pinul CLK al lui CI2
    - pinul :10 al lui CI2, la pinul CLK al lui CI3
    - si in fine, pinul L10 al lui CI3 , merge la pinul CLK al lui CI4
    In acest fel, cand CI1 ajunge la 10, incrementeaza CI2. Valabil pt restul.

    Pentru RESET, toate CI-urile trebuiesc sa poata fi resetate. Trebuie sa pui un intrerupator care cand e apasat , trimite 5V catre pinii de RESET ai celor 4 4026.

    Semnalul il introduci prin pinul CLK al CI1. Dupa cum vezi, primirea unui puls pe CLK produce incrementare.

    Da-mi de stire daca ai si alte intrebari.

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