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This occurs because of the property of by which it keeps track of all past before power up also activities.

Click here to register now. Real quick something that could maybe work is using a chip like a in a missing pulse configuration. The result energises a relay for 60 seconds. Figure 1 block diagram inside CDIC. My circuit only accepts a coded number of rings.

STMicroelectronics HCFBE – PDF Datasheet – Series In Stock |

This really neat chip contains a counter and a decoder circuit, that can show a single output pin for each count from 0 to 9. Replacement Transformer Started by ncag Today at 7: The output would remain high till the dayasheet between pulses exceeded the RC time set and the output would go low.

Thus the counter starts in a fresh mood to count exact no. Articles Top Datassheet Search resources. For a better experience, please enable JavaScript in your browser before proceeding. See the attachment in this last thread.


I have been in the phone tapping and phone coding business for over 20 years. An 8 pin PIC chip and 6 components is all you need. This ensures that they cannot be accidentally pulled off the circuit easily. Counters hcfbe datasheet hcfbs the B are cheap and yet surprisingly useful. Media New media New comments Search media.

Hi, I modified the circuit to automatically reset independent of the number of rings.

You must log in or register to reply here. This site uses cookies to help personalise hhcf4017be, tailor your experience and to keep you logged in if you register. It will activate the output for any number of rings above 5. The monostable is initiated by the first positive clock edge at pin 14 CLK.

(hcf4017be) decade counter with 10 decoded outputs

What pin is it connected to? For a signal input continue the circuit can produce general frequency may use IC NE all right. But this will introduce Delay time 1. So Quasi length 0. Welcome to our site! Q1 through Q4 are ORed with diodes. All these are done to count exactly 5 rings.

A good example hcfbe datasheet seen below. But the problem is that when we power up the circuit again, the counter starts from out “9” not from initial “0” when detecting first LOW-to-HIGH clock edge. The pulse datasheef the timer can be used hcfbe datasheet activate the B circuit. It has active HIGH pin Chfbe 12 is Carry output, for the clock input of an additional counter or an external circuit that hcfbe datasheet count is complete.


The IC counts with 5 D-type flip-flops. On reaching “9” again returns to “0” and so on. The big problem with your circuit is this: See my attached link ” in first post. Zelino February 17, Reply. Add a Comment Cancel reply Your email address will not be published. To participate you need to register. All suggestions are hearty welcoming Boncuk, if i have not understand wrongly, the 4 doides connected from 2nd to 5th out puts are not important, since as he said if the ring discontinues in between, then on of the input would be high and you will never get a reset output.

The output would be low and on rings go high. The B is most useful when combined with a timer such as a based circuit. The outputs will change at one tenth the speed of the first B IC. Boncuk New Member Feb 26, I think this is the most perfect circuit. Is there any counters exist that has no past tracking feature.