I’m working through Charles Platt’s Make:Electronics 3rd Edition and am working on a counter circuit that uses a 555 timer, 4026B counter and a 7 segment display.
I can’t figure out why my circuit doesn’t work with the 10k resistor that Platt instructed to use and only works when I short the resistor with my finger or with normal wire. I’ve tried using varied ohm resistors from 1M to 4.7K and they still don’t get the circuit to work. I’ve tried connecting the resistor directly to the chip pin and ground and still no good(this suggests it’s not a faulty breadboard rail. I triple checked my wiring and checked for continuity using my multimeter and as far as I can tell contacts are all good. I doubt it’s an issue with Platt’s schematic because he’s diligent about listening to his readers‘ suggestions and this would have been fixed by the 3rd edition. It’s surely a fault on my end but I can’t figure out what it is.
Has anyone had a similar issue when working with this circuit? Or if anyone can take a guess just from these limited pictures what might be going on I’d love to hear.
Edit: I swapped the battery because the current one was at 8.7V and the new one now reads 9.4V but the 10K resistor still doesn’t work. It does however work with a 4.7Kohm resistor now. I guess the resistance ser for the circuit design is just too high.