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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Nowadays, i could make a more complex systems, with security code, LCD display and hardware key, but i decided to make datasheef more simple yet secure circuit for the other ‘kids’ that want to boot with more than just a cold pushbutton.

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 Which circuit are you using? How to set the desired code we want and how to change it? There are 4 connectors, D1 through D4. At 24 January 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.

Each one must go to one and only key! Anyways thanx for ur time and help Now you press the digit 4 first. Datasheey 4 D inputs are the ‘correct’ buttons.


CD4072 – Dual 4-In OR Gate

Here is a video from the circuit in operation! 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. As for the code. This is exactly the same circuit as the previous one, with the only difference on the reset.

To change the code, you need to change the wires of the buttons accordingly. At 22 August For example, if you want to have the code ” you connect D1 to button 4, D2 to button 5, D3 to button 2 and D4 to button 1. At 31 May7: May be an auto-reset feature should be added? Please continue this conversation there because it may become a long thread: Test it and post the results. Also, one digit cannot be more than once in the security code.

I know this is not an elegant way, but i did not want to use a microcontroller for this circuit. Actually one of my Ic’s Pin was broken. At 3 September The keys can be a push-button with one normal-open contact, connected to the positive VDD of the circuit. If you will use normal push-buttons for the keypad, i suggest you use the following circuit instead. I opened a forum thread for you to follow.

CD (INTERSIL) PDF技术资料下载 CD 供应信息 IC Datasheet 数据表 (5/10 页)

At 1 June0: At 23 August NEW in h eaven! That’s why i prefer to have separated connections.


It could be better with just one, but i think i am used to this way. 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. At 18 June There are more simple but less secure circuits.

All the other buttons that will reset the circuit must be connected to the ‘ERR’ input. At 28 July7: Did i solve your problem? It is easy, At 1 March3: Thanx in advance At 25 August What should I do???

Is this design able to expand to accommodate a seven digit code? Yes i could do that and it would be the same as i do now. At 2 September That was one of my imaginations when i was a kid. The R is LOW.

You mean you cannot see it clear? After datasueet this circuit on breadboard, I found that it would not reset after pressing the correct key-codes.

When no key is pressed, the S is also LOW from the pull down resistor. U mean,all other datadheet except the 4 code button should be connected to ERR?