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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Most of the images will maximize on click. Whenever a ‘wrong’ button is pressed, all 4 flip-flops will be RESET and the code must be entered again from the beginning. The digit ‘4’ is more than once in the code and catasheet cannot happen. All the other buttons that will reset the circuit must be connected to the ‘ERR’ input.

Those should be connected to the 4 buttons that you want to have the code. The circuit is designed to operate at any voltage between 5 and 15 volts. By the end of this week i will have prepared the video of this circuit in operation datasheeet we do for all our circuits and experiments.

U mean,all other button except the 4 code button should be connected to ERR?

CD 데이터시트(PDF) – TI store

If you do, datasheett can edit your previous posts and not need to repost a new comment, if you only want to add something At 27 December At 28 July7: At 14 November1: I know this is not an elegant datwsheet, but i did not want to use a microcontroller for this circuit. You mean you cannot see it clear? After testing this circuit on breadboard, I found that it would not reset after pressing the correct key-codes. Here is a video from the circuit in operation!


How to do it? It could be better with just one, but i dataaheet i am used to this way. When no key is pressed, the S is also LOW from the pull down resistor. Anyways thanx for ur time and help 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. Each ‘correct’ key press will SET a flip-flop.

CD Datasheet – CMOS OR GATES from Texas Instruments

This circuit is significantly simpler and equally secure to the previous one. It needs a smaller PCB an one chip less. Datashret, 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 dagasheet than just a cold pushbutton. Now imagine the same scene, but instead of pushing just a button, you enter the security code!


The keypad could be normal pushbuttons. Look at the following PCB layout:.

CD4072 Datasheet

This circuit has the CD Fd4072 included and can be used with touch keypad as well. It has the same functionality, it is simpler, but it cannot be used with touch keypads. I kept it as simple as possible. Thanx At 15 January So if the cd40722 had 10 keys and the code was ” the keys 1,3,4,6,7,8 and 0 must be connected to the ERR input. Also, if the code must be entered in the correct order.

I opened a forum thread for you to follow. Is this design able to expand to accommodate a seven digit code? But if you have questions please use the forum instead to post it.

Or the reset line has a problem. Thanx in advance At 25 August The circuit on a breadboard datasjeet test. Now you press the digit 4 first. If you will use normal push-buttons for the keypad, i suggest you use the following circuit instead. At 2 September The one with the or with the diodes?