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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Actually one of my Ic’s Pin was broken. Yes i could do that and it would be the same as i do now. Also, if the code must be entered in the correct order. At 21 May Plz help dataaheet its Ergent: The circuit is designed to operate at any voltage between 5 and 15 volts.

By the end of this week i will have dayasheet the video of this circuit in operation like we do for all our circuits and experiments. What should I do??? When you leave the 4th digit, everything returns to LOW. So, No, it would not work.

U mean,all other button except the 4 code button should be connected to ERR? It has the same operation as the previous one, but it is not recommended to be used with a touch keypad!

But it would require more cables to draw on the circuit and this makes me datashset sometimes.

Here is a video from the circuit in operation! The keypad could be normal pushbuttons.

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CD Dual 4-input OR Gate – leetechbd

Is this design able to expand to accommodate a seven digit code? I have not test it but it could work. At 27 December If you will use normal push-buttons for the keypad, i suggest you use catasheet following circuit instead. The 4 D inputs are the ‘correct’ buttons. Look the video and read the section “The keypad”.

At 18 June If you do, you can edit your previous posts and not need to repost a new comment, if you only want to add something At 27 December Now imagine the same scene, but instead of pushing just a button, you enter the security code!

At 22 August All other buttons as many as you like should be connected all together to the 5th connector labeled ‘ERR’.

CD4072 Dual 4-input OR Gate

It has the same functionality, it is simpler, daatasheet it cannot be used with touch keypads. Based on your circuit, I made another version which also include the feature mentioned above and the “disable the keypad when green LED lights” datasjeet again after 5 seconds. Whenever a ‘wrong’ button is pressed, all 4 flip-flops will be RESET and the code must be entered again from the beginning.

At 2 September You are talking about the first or the second circuit? At 14 November1: To change the code, you need to change the wires of the buttons accordingly. You are welcome to comment for corrections and suggestions on this page.

CD datasheet & applicatoin notes – Datasheet Archive

The one with the or with the diodes? You mean you cannot see it clear? AC electric motor working principle. Imagine that you sit on your PC desk, you pull the keyboard, the mouse is near by, you click the button and the computer boots.


This circuit is significantly simpler and equally secure to the previous one. This circuit does not have the chip. But now its working perfect It can have as many ‘wrong’ digits as you like, but up to 4 ‘correct’ digits.

So if the keypad had 10 cd072 and the code was ” the keys 1,3,4,6,7,8 and 0 must be connected to the ERR input. Also, one digit cannot be more than once in the security code. Look at the following PCB layout:.

The code to open the lock would be ”. Thanx in advance At 25 August Those should be connected to the 4 buttons that you want to have the code. Sometimes i should use more than i should, like now that i have separated on the top-right corner for the IC power supplies.

At 28 December The keys can be a push-button with one normal-open contact, connected to the positive VDD of the circuit.

The only thing that needs to be changed is the relay.