I suspect there are two mains options:FYI if anyone is still looking at this.....
I have had the same issue. The chips are labeled from Texas Instruments, and I have tried 5 so far...all do exactly the same as the original post. One popped on the breadboard while triggering the reset pin, another got super hot, but I cut power before it fried.
I bought them from Amazon.
I am going to run some tests on another tomorrow, no load...low power (5v) and see what I get out of each pin.
It's odd that most of the schematics/ videos/ guides show no transistors/resistors at all between the output pins and the display.... someone got it working this way (maybe not for long). example: https://circuitdigest.com/electronic-circuits/555-timer-seven-segment-counter-circuit
And before you ask....I am not new at this, but I can't get this circuit to work either. I am assuming the chips are bad, or the schematics on the web are wrong.
Examine the printing on the chips with a good magnifying glass, or microscope - you'll probably be able to see that the original chip number has been removed, and reprinted with a fake number.Yep. They're bad for sure. I set it up with no display and just checked for voltage at the output pins and only the B output showed anything. Tried the reset pin... no change. I used a regulated 5v supply and antistatic precautions. It was the same result as the other 5x.
I'm returning them today.
I am ordering some directly from Texas Instruments for only $1 more than Amazon.
I'll post how those work in a few days.
Usually I don't, but I am working on a time sensitive project and wanted them quick. Amazon Prime should have gotten them to me fast (it didn't). It was to replace a counter module I already had that failed due to a bad internal battery. I just need to get this done before the Florida rainy season starts. (It is for a rainwater pumping system that is ready to go. Except for this one circuit that shows how many cycles it has run).Why do people buy cheap fake ICs from an online clothing and kitchen appliances store ?
Presumably Prime wasn't an option as it's most likely a Chinese company using Amazon Marketplace?.Usually I don't, but I am working on a time sensitive project and wanted them quick. Amazon Prime should have gotten them to me fast (it didn't).
As long as you've got an RS account postage is free, and we do have an account - and get RS deliveries most daysI'm with Nigel.. I get some of my stuff from Rapid-online.. CD49026BE are 34p ea.. I know delivery costs but you can get the 555 and the 7 seg display as well All for under a quid...
Did you closely examine the chips as I suggested in post #45?.BTW... The Texas Instruments chips came, and they work perfectly. The other ones were defective... both packs, all 30 of them.