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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All other buttons as many as you like should be connected all together to the 5th connector labeled ‘ERR’. There are 4 connectors, D1 through D4.

How to do it? That’s why i prefer to have separated connections. This circuit has the CD Chip included and can be used with touch keypad as well. But if you have questions please use the forum instead to post it.

Here is a video from the circuit in operation!

CD4072 Dual 4-input OR Gate

Then you will connect the RESET of this new flip flop to the output of the pin 1, that is the reset signal dc4072 an error button. Also, if the code must be entered in the correct order.

At 3 October There are more simple but less secure circuits. Did i solve your problem? This is exactly the same circuit as the previous one, with the only difference on the reset. Those should be connected to the 4 buttons that you want to have the code. 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.


Datashret 29 December5: That was one of my imaginations when i was a kid. If you will use normal push-buttons for the keypad, i suggest you use the following circuit instead. You mean you cannot see it clear? Look what happens at the truth table in this situation. To change the code, you need to change the wires of the buttons accordingly.

Look at the following PCB layout:. It can have cx4072 many ‘wrong’ digits as you like, but up to 4 ‘correct’ digits. It could be better with just one, but i think i am used to this way.

As for the code.

This circuit is significantly simpler and equally secure to the previous one. Click on it and it datashwet maximize. Please continue this conversation there because it may become a long thread: It has the same functionality, it is simpler, but it cannot be used with touch keypads. I have not test it but it could work. It is the same. It needs a smaller PCB an one chip less. Suppose now that the code datashete Which circuit are you using? Also, please, subscribe to the comments board.


CD Datasheet PDF – Intersil

At 21 May At 29 December6: The only thing that needs to be changed is the relay. Nowadays, i could make a more complex systems, with security code, LCD display and hardware key, but i decided to make a more simple yet secure circuit for the other ‘kids’ that want to boot with more than just a cold pushbutton. May be an auto-reset feature should be added? Simple is nice Datasheeg than programming a microcontroller.

You datxsheet talking about the first or the second circuit?

(PDF) CD4072 Datasheet download

How to set vd4072 desired code we want and how to change it? At 22 August Also, one digit cannot be more than once in the security code. Plz help me its Ergent: Now you press the digit 4 first. Look the video and read the section “The keypad”.

The R is LOW. I kept it as simple as possible.

CD Dual 4-input OR Gate – leetechbd

This circuit has a 4-digit security code that is hardware selectable. At 23 August The 4 D inputs are the ‘correct’ buttons. Suppose for example that you choose to have 10 digit keypad with numbers from 0 to 9. You are welcome to comment for corrections and suggestions on this page. At 19 June9: