#1230

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IMSAI Guy

Жыл бұрын

Episode 1230 chip of the day 4017
A look at this chip and some discussion about digital logic
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Пікірлер: 39

@user-eo5ny9ww4m Жыл бұрын

I don't think the circuit is drawn wrong. It is a Clock Inhibit input, not a Clock Enable. If the Clock Inhibit is high, the bottom input to the NOR gate will be high, so the output will always be low. That will prevent the clock input from toggling the output of the NOR gate. When the Clock Inhibit is low, the clock signal will be allowed to toggle the output of the NOR gate.

@jerril42 Жыл бұрын

Must be careful not to be an enabler 🙃

@mickgibson370 Жыл бұрын

I build an electronic rpm meter back in 80s that would 1/100 rpm in a minute. Dam machines was so irregular that the rpm was 60.12 and the next second 45.68. I memorized the logic and when you show the picture of the circuit, I still have it even I have a stroke 28 years ago.

@mikegLXIVMM Жыл бұрын

I've used this chip as a frequency divider. You divide by 2-10 based on where you tie the reset.

@RideGasGas Жыл бұрын

Back in the Army when we were learning about the satellite communications equipment, there was a piece of gear called the SSLU, system status and logic unit. It was discrete logic and all NAND gates and inverters. Cards and cards of them. We learned logic tables and they described De Morgan's theorem to us and how to get to basically anything using some combination of inverters and another gate type. Pretty mind blowing at the time for young kid just learning digital for the first time. Then along came PLDs, one little chip, and all sorts of possibilities replacing a whole handful of logic chips :)

@jstro-hobbytech Жыл бұрын

I've read the Don Lancaster books and learned all that with the karnaugh maps and such. I was obsessed with it a while back haha.

@MyProjectBoxChannel Жыл бұрын

I love the 4017! even in this world of cheap microcontrollers. I don't think I'll ever stop using it. It's a bit like the 555, it always comes in handy in my bag of circuit tricks👍😉 sometimes I use a flashing LED as a simple clock for the 4017.

@andymouse Жыл бұрын

Classic chip ! perfect for making a Larson Scanner better known as a "Cylon" eye or of course the knight Rider lights, in fact I believe in some EE courses they ask you to make the Knight effect with hardware and also ask you to make the same in software which is a neat task for any beginner....love your 'chip of the day'...cheers.

@X-OR_ Жыл бұрын

A Very Logical Episode !

@jerril42 Жыл бұрын

Interesting chip and logic demonstration. I looked up DeMorgan's Law on Wikipedia. I think the Text Search implementation of the law helped me to understand it: Search A: NOT (cars OR trucks) Search B: (NOT cars) AND (NOT trucks)

@Enigma758 Жыл бұрын

With a little diode steering, you can make them output any pattern you like. I've used them for sequencing unipolar and bipolar steppers.

@t1d100 Жыл бұрын

Thank you.

@M0UAW_IO83 Жыл бұрын

Oh I made a good amount of pocket money with these chips, I made LED Knight Rider lights for schoolmates and later sequential tone roger beeps for CB.

@nickcaruso Жыл бұрын

what happened to the circuit from china? :-)

@vincei4252 Жыл бұрын

Yeah, totally agree that the logical implementation of the internal circuit should have been shown in the data sheet as opposed to the physical implementation. But I guess looking at the truth table would really have been all you needed to know without going through the mind gyrations.

@mmpiforall5913 Жыл бұрын

It bums me out that CD series CMOS is considered 'old', OK it is, but these handy building blocks along with 7400 series, LM analog circuits, INXX 2NXX and 3NXX parts allows a lot of circuit design in small business, industry and everyone else. If we only had LSI scale ICs to work with, imagine how limited we would be!

@AnalogDude_ Жыл бұрын

they are produced and sold freshly today, it's still pretty hi-tech and you need an electron microscope.

@mrtom64 Жыл бұрын

Very good but I'm surprised you casually brushed aside the usefulness of the reset pin.

@jp040759 Жыл бұрын

It's funny how you see this schematic with all 10 resistors. One for each LED. In actuality your really only need one resistor since only one LED is on at a time. Useful chip with some creative thinking.

@stevenwright901 Жыл бұрын

Yeah, what’s that about

@jp040759 Жыл бұрын

@@stevenwright901 ?????????????????????????????????

@markharrisllb Жыл бұрын

@@jp040759 I think Steve Wright was agreeing with you and asking what all the resistors were about, ie why have them all?

@zilog1 Жыл бұрын

This chip looks useful for a control unit for a cpu design

@squidkid2 Жыл бұрын

So what did I learn. That data sheets sometimes are totally incorrect. Well that's really reassuring for all us newbies who rely on them to be correct. Interesting.

@IMSAIGuy Жыл бұрын

the datasheet is not incorrect. I just point out drawing the schematic a different way to show functionality. If you are designing your own digital circuits this can be valuable.

@AnalogDude_ Жыл бұрын

Maybe you should adapt the title and add CD4022 as wel. You forgot to mention that the reset pin resets the device to pin "0" witch is pretty useful and could be overlooked.

@richardl6751 Жыл бұрын

This is the chip I used for my little circuits. 6 led scan kzfaq.info/get/bejne/pdqmm6d8krqnnZc.html One way scan kzfaq.info/get/bejne/o8WdpdWr1patY6s.html two way scan kzfaq.info/get/bejne/pM2ZZ8immbG2p6s.html

@alekseibutyaev2318 Жыл бұрын

where you bought a led set? or it is yours product

@IMSAIGuy Жыл бұрын

that one I bought on eBay. search 'LED 6bit'

@alekseibutyaev2318 Жыл бұрын

@@IMSAIGuy subscribed to your channel for 3 months. there are interesting episodes, for example, by GAL. you should have posted the source code.. the technology is old, but sometimes it's hard to get into grandfather's chest.

@byronwatkins2565 Жыл бұрын

I found most logic rather obvious, but DeMorgan's theorems took some convincing.

@sammin5764 Жыл бұрын

🌟🌷🌟

@DiaconescuAlexandru2024 Жыл бұрын

Circle circle

@mariobv947 Жыл бұрын

Hi @IMSAI Guy, Do you remember the e-mail message i sent to you some days back, regarding a resistor ladder, that you never replied and probably never read as such e-mail would be still waiting in the spam folder? If you look over my KZfaq channel, you will find a video in which i hacked a 30cents 4017 module from China into a full logarythmic stereo vumeter by using a resistor ladder of the same kind (it uses the same working principle as a special DAC, but using different values because in this circuit, the purpose is to generate a stepped exponetial to be compared with the input signal, hence the logarythmic behaviour of the vumeter).

@IMSAIGuy Жыл бұрын

I did look at the two websites. it was pretty basic, but thanks.

@mariobv947 Жыл бұрын

@@IMSAIGuy Yes, it is very basic, but i've never seen such a simple manner of generating semitone voltages (2^(1/12)) for feeding a 1Hz/mV VCO using comercial valued resistors. People making monophonic keyboards or keynote sequencers, have to deal with linear to exponential converters and voltage quantizers to get music notes from their oscillators. Even for people doing 555 keytone boards have to adjunt or trim every single resistor for every keynote. I did it just simple with a linear VCO made of a 555 and a couple of opamps, some SPDT momentary switches, and that resistor ladder, and it fits as a fiddle. I thought this could be of any use for your synth if you want to add a sequencer (made of a CD4520 and some sram like HM6116 or so) that generates voltages that can be matched to semitones this way. Thank you, anyway.

@shadimurwi7170 Жыл бұрын

Zamzam water from mecca saudi arabia is tasty

@iblesbosuok Жыл бұрын

Inhibit = NOT(Enable)

@andye2005 Жыл бұрын

The DeMorgan brought back a quote from my early electronic training Break the line change the sign It turned out to be fairly simple. It was never described as the different shapes. Different teaching methods I expect One of the main uses was to enable a circuit to use all the same type of gates Now I will have to look up karnaugh maps again