CD datasheet, CD pdf, CD data sheet, datasheet, data sheet, pdf, Intersil, CMOS OR Gate. CD – Dual 4-In OR Gate. Item #CD $ $ The CD is supplied in a 14 lead outline package: Features a Thru-Hole Device. Data Sheet. Texas Instruments cd Logic Gates are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas Instruments cd Logic.

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There are more simple but less secure circuits.

CD4072 Dual 4-input OR Gate

At 3 September Sometimes i should use more than i should, like now that i have separated on the top-right corner for the IC power supplies. It has the same functionality, it is simpler, but it cannot be used with touch keypads. I kept it as simple as possible. Actually one of my Ic’s Pin was broken. At 22 August All the other buttons that will reset the circuit must be connected to the ‘ERR’ input.

CD4072 – Dual 4-In OR Gate

At 15 January Thanx in advance At 25 August At 28 December Click on it and it datashet maximize. Also, if the code must be entered in the correct order. One code could be the numberor thebut the code is wrong! Each ‘correct’ key press will SET a flip-flop.


Did i solve your problem? For example, someone could connect the D1 to key number 4, the D2 to key number 2, the D3 to key number 9 and D4 to key number 5. Nowadays, i could make a more complex systems, with security code, LCD display and dqtasheet key, but i decided to make a datasyeet simple yet secure circuit for the other ‘kids’ that want to boot with more than just a cold pushbutton.

CD datasheet & applicatoin notes – Datasheet Archive

The digit ‘4’ is more than once in the code and that cannot happen. The keys can be a push-button with one normal-open contact, connected to the positive VDD of the circuit.

You are welcome to comment for corrections and suggestions on this page. AC electric motor working principle. Also, please, subscribe to the comments board. Plz help me its Ergent: Simple is nice Kammenos,rather than programming a microcontroller.

This cx4072 has the CD Chip included and can be used datssheet touch keypad as well. A nice print-out with some kind of artwork and holes that correspond to the keypad PCB-keys, can mask the keypad and make it more elegance. So, No, it would not work. At 24 January At 29 December5: It can have as many ‘wrong’ digits as you like, but up to 4 ‘correct’ digits. Most of the images will maximize on click. There are 4 connectors, D1 dxtasheet D4. You mean you cannot see it clear? That’s why i prefer to datsaheet separated connections.


Thanx At 15 January At 21 May Based on your circuit, I made another version which also include the feature mentioned above and the “disable the keypad when green LED lights” enables again after 5 seconds.

Those should be connected to the 4 adtasheet that you want to have the code. Look the video and read the section “The keypad”.

At 31 May7: Is this design able to expand to accommodate a seven digit code? I referred some resources and dwtasheet that it can be done by a timer and some parts. The circuit on a breadboard for test. At 14 November1: Whenever a ‘wrong’ button is pressed, all 4 flip-flops will be RESET and the code must be entered again from the beginning.

It needs datxsheet smaller PCB an one chip less. It could be better with just one, but i think i am used to this way. Suppose now that the code is The keypad can have as many keys as you like.

This is exactly the same circuit as the previous one, with the only difference on the reset. I know this is not an elegant way, but i did not want to use a microcontroller for this circuit.