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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It can have as many ‘wrong’ digits as you like, but up to 4 ‘correct’ digits. I kept it as simple as possible.

The circuit on a breadboard for test. If you will use normal push-buttons for the keypad, i suggest you use the following circuit instead. So, No, it would not work. At 2 September The code to open the lock would be ”. When you leave the 4th digit, everything returns to LOW. Click on it and it will maximize.

CD Datasheet pdf – CMOS OR Gate – Intersil

Now imagine the same scene, but instead of pushing just a button, you enter the security code! Look the video and read the section “The keypad”.

Plz help me its Ergent: You are talking about the first or the second circuit? At 23 August Whenever a ‘wrong’ button is pressed, all 4 flip-flops will be RESET and the code must be entered again from the beginning. When no key dafasheet pressed, the S is also LOW from the pull down resistor. How to do it? Look what happens at the truth table in this situation. The only thing that needs to be changed is the relay.


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. Sometimes i should use more than i should, like now that i have separated on the top-right datsheet for the IC power supplies. As for the code. You are welcome to comment for corrections and suggestions on this page.

Did i solve your problem?

CD4072 PDF Datasheet浏览和下载

The keypad can have as many keys as you like. All dataheet other buttons that will reset the circuit must be connected to the ‘ERR’ input. Now you press the digit 4 first. May be an auto-reset feature should be added? I referred some resources and found that it can be done by a timer and some parts.

But it would require more cables to draw on the circuit and this makes me sick sometimes. The one with the or cv4072 the diodes? Instead, it uses diodes connected as OR gates. I know this is not an elegant way, but i did not want to use a microcontroller for this circuit.

Yes i could do that and it would be the same as i do now. By the end of this week i will have prepared the video of this circuit in operation like we do for all our circuits and experiments.

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After testing this circuit on breadboard, I found that it would not reset after pressing the correct key-codes. Test it and post the results.

Or the reset line has a problem. Also, if the code must be entered in the correct order. The circuit is designed to operate at any voltage between 5 and 15 volts.

CD4072 Datasheet

NEW in h eaven! So if the keypad had 10 keys and the code was ” the keys 1,3,4,6,7,8 and 0 must be connected to the ERR input. 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.

This circuit does not have the chip. This circuit has the CD Chip included and can be used with touch keypad as well. This is exactly the same circuit as the previous one, with the only difference on the reset.

At 3 October Suppose for example that you choose to have 10 digit keypad with satasheet from 0 to 9. For example, someone could connect the D1 to key number 4, the D2 to key number 2, the D3 datasehet key number 9 and D4 to key number 5.

To change the code, you need to change the wires of the buttons accordingly.