4000 Series Logic ICs: The 4026 7 Segment Decoded Decade Counter

Playing around with 4000 series logic ICs, this is the 4026 a Decade Counter with 7 segment display decoded outputs.
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[@dparson]

This is an awesome series you have started, thanks for continuing it!

[@louisbanaszak3125]

great series coherent and to the point

[@MYNICEEV]

awesome my friend

[@chakchakaa]

hi Sir, I have a question, what about if I use 4 switches and two 7 segments display? and what I'm trying to do is when i switch on the first switch it will display 0,1 and when I switch down the first switch and switch up the second switch it will display 0,2 and ? Any Suggestion Sir? Thanks

[@zeusandes969]

Hello david, is there a chance that i can decrement the out of the 7 segment just using the IC4026? any suggestion? Thank you

[@DavidWatts]

Not as far as I know, you can only count upwards.

[@michealmyers4515]

@@harlanrosco439 I think a CD40193 would do that It has two pins count down and count up So depends on which of you give high

[@thethinkstudio1200]

how can i do this with a 4 digit 7 segment thats one unit not 4 single segments ???????

[@clarkso65]

the schematic is quite blurry, may i ask what value is the capacitor?

[@DavidWatts]

You can probably see it on the breadboard it is 100nf/0.1uf (104) and it only exists for debouncing

[@clarkso65]

thank you for your quick response.

[@modelmodz]

Hey David is there a way to make this stop at a set number rather than 99 say stop at 60 and then reset to 0

[@DavidWatts]

Yeah that is possible, you would need to add another IC though. The first number to light segments C-D-E-G is the 6 so you can use that as a logic switch. A 4081 is a Quad 2 input AND gate would be useful here so you could feed those segments into to gates and the resulting gate lines into a final gate. Once the 6 appears the output on that gate would go high, connect that the the reset pin and it would reset the ICs when that digit hit a 6.

[@modelmodz]

David Watts great.. Instead of it reseting can it keep the number on the display. Until I switch power off?

[@DavidWatts]

I suppose you could use a transistor between the clock pin and clock source ant block it off instead of resetting.

[@darshanthakker6704]

k.....thanks 👍

[@ponymoore6140]

Great, but how to I connect the two counters and displays? Any cirrcit diagram?

[@DavidWatts]

Essentially just duplicate the circuit but your second 4026 takes it's clock input from pin 5 of the first. Pin 5 is the carry out/divide by 10 output.

[@ponymoore6140]

@@DavidWatts thank you :)

[@lilliampumpernickel9916]

is there a way to make them count down, i need to make a bomb and its really twisting my mind. (just joking about the bomb)

[@DavidWatts]

Not on that IC but you could use a 4510 coupled with a 4511, the 4511 is a BCD to 7 segment driver and the 4510 is a decade counter to BCD. The 4510 can be told to count up or down.

[@lilliampumpernickel9916]

Thank you

[@glenndollatayan699]

sir where can i see the circuit diagram of this?

[@DavidWatts]

Errr like 1/3 of the video is me talking about it while pointing to a drawn version.

[@glenndollatayan699]

i meant the circuit diagram you used on the second breadboard sir. it makes the display of the 7 segment incremented with different speeds.

[@DavidWatts]

Glenndol Latayan Essentially it is this with a couple of modifications for my needs - www.hackersbench.com/Projects/1Hz/

[@darshanthakker6704]

only common cathode 7 segment display can be used ??????

[@DavidWatts]

+darshan thakker It can only use a common cathode unless you use transistors on the outputs.

[@henri.witteveen]

you can also use a transistor array driver like the 2803. The 4026 can't drive a high output current, only about 1 mA or so. Using a 2803 you can use common anode displays and you can drive these with a higher output current which means more light. The 4026 can be used up to around 6Mhz.