Small intro: I'm adapting this NE555+CD4017 module to fit into a nice little box and I am switching out the plastic trimpot that came with the package for a metal one that can fit through wood. The trouble is, only now I see that the trimpot that came with the module, was a 103 (plastic) instead of the 503 it should have been - as indicated on the diagram and pictures of the module. I ordered a replacement 10k metal potentiometer because I based myself off the '103' indication on the actual module instead of the diagram... silly me. It's only now that I notice the 10-50k difference because I was looking up how to wire them up again.

  • picture of diagram & components in question

enter image description here

Actual question: Right now the LEDs get shifted really fast (because of the 103- 10k pot?) and I think it should be able to go a lot slower if I use the 503 - 50k pot). If I put in some extra resistors, say 20k worth more in series with the 10k potentiometer, would the shifting of the LED lights go slower by default? And if I just order a new metal 50k potentiometer I would probably have the whole range (slow-fast)?

Thanks in advance!

  • \$\begingroup\$ why are you not able to determine if the leds shift slower when the resistance of R4 is increased? \$\endgroup\$
    – jsotola
    Feb 27, 2019 at 19:28
  • \$\begingroup\$ @jsotola my stock of extra components is "0" So if I were to test with different stuff, I would have to go buy some - that's why it is theory only right now :| \$\endgroup\$
    – iridian
    Feb 27, 2019 at 19:30
  • \$\begingroup\$ Get a resistor kit, or a grab-bag. A good resistor kit will be more expensive, but will have better coverage and quality. A grab-bag (if you can even still get them) will be factory floor-sweepings. \$\endgroup\$
    – TimWescott
    Feb 27, 2019 at 19:43

1 Answer 1


Yes. You could also increase the value of C1.


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