I think this was due to timing differeces between the makes of and used for U1 and U8. This was fixed by adding a pF capacitor between pins 15 and 16 of U1. If you have this problem, you may find that a smaller value could be required, e. Another person reported the hours count going 9,10,11,12,1,2,1,2 which was fixed by removing C2. Thoughts as to why?
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I think this was due to timing differeces between the makes of and used for U1 and U8. This was fixed by adding a pF capacitor between pins 15 and 16 of U1. If you have this problem, you may find that a smaller value could be required, e. Another person reported the hours count going 9,10,11,12,1,2,1,2 which was fixed by removing C2. Thoughts as to why? Just wondering as I have 20 more of the of the TC on the way. Yes, switched chips across from working and none working, and the problem follows the chip the HEF.
Can't find a spec or have an idea WHY. Clock works normally. Any circuit based on triggering in response to a very brief spike can and will behave erratically under certain conditions.
Sounds to me as if one variety of your flip flops has a longer propagation delay than the other kind does. This is what it sounds like to me, given the little bit of information that you provided. Just the very fact that one kind of works, and the other does not, points to something such as this. In order to get to the bottom of this and to find out why, all of the ics need to be tested in a test circuit that puts them through their paces. If they all test good, such as if they all would divide by two in a simple test circuit, then a closer look at the kit's circuit that they are in would be the next step.
No contracts, No fees, No Kidding! Sounds like maybe some spurious noise getting on that reset pin. I would be very curious to see that part of the circuit, because somehow this pin 15 is not getting a solid reset signal, or it is getting some noise that creates a false reset at an improper time. In my experiences: 's reset pin can be very noise-sensitive. But, most often, noisy protoboard circuits that need a small cap to ground usually, not Vdd as above on that pin, usually behave themselves much better in the final version on a pc board or a wirewrap board.
But, having the reset being dependent upon which kind of you are using is kind of a trouble sign. I'd like to see that portion of the circuit. This cannot be undone. The Group moderators are responsible for maintaining their community and can address these issues. Report to Groups. This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. Note: Your email address is included with the abuse report.
Toggle navigation. Home Messages Hashtags. Search Only Within This Topic. Search Cancel. Topics Search. I purchased like 4 or 5 clock kits basic on Mike H design. For no known reason, I purchased 13 more kits because owning 18 clocks allows me to know what time it is?
Who knows. The seller was short on parts and substituted many items or simply short shipped. So, after a couple of months ordering from everywhere in the world, I finally got everything. Yeah, 7 of 13 haven't built the rest yet are alive and running, except one fatal issue. Hours go normally, So, the hours place is not resetting for 2 back to 0, which is driven by the It turns out the chip is a HEF To quote Mike's website: "One builder has reported a problem with the hours not resetting properly, i.
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TC4013BP FLIP-FLOP. Datasheet pdf. Equivalent
Purchase Inquiry Parametric search. Purchase and Sample Please contact one of Toshiba's official distributors or the nearest Toshiba sales office. Global Sales Contact You can search for and purchase a small on-line sample by clicking on the following link. Document select all download for selected If the checkbox is invisible, the corresponding document cannot be downloaded in batch. Notes The Part Number column shows representative part numbers only, which may not be available for sale in the precise form shown. Each Part Number constitutes a product family which may contain multiple associated product configurations. The RoHS compatibility information provided herein is to the best of Toshiba's knowledge and belief accurate as of the date Toshiba entered the information into this database.
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