LED circuit for 1/6 scale diorama

[ZipZapOuch]

When I connect 13 to 16, it shuts down the circuit.
Using your original diagram you gave me, and putting pin 13 to ground, here is what I get....

LED #1 comes on....stays on for 1.4 seconds and turns off.
LED #2 comes on .7 seconds after LED #1 turns off and stays on for 1.4 seconds.
LED #3 comes on immediately after LED #2 turns off, flashes twice and turns off.
Then the circuit resets.

So, is it possible to have #1 and #2 to turn on and stay on throughout the duration of the circuit?

And, is there a way to have LED #3 to turn on 1.4 seconds after LED #2 comes on and blink 6+ times before turning off and resetting the circuit?

Also, I can't use 3 inputs on the first and second bank of LED's.
If I use 2, it will illuminate, but it's dim.
If I use 3, it wont illuminate at all.
Im using only 1, 3 volt white light LED with no resistor.
using 2 LED's dims them both unless i bump up the input voltage to 6 volts.

Thank you again for all your help.

Ok, try this... but, when rediculous speed comes on, the light speed sign will dim a bit.

When the ludicrous speed sign comes on, the rediculous sign will dim a bit (but the light speed sign will NOT dim more).

You can make the dimming less severe by using a higher voltage for your supply (6 or 7.5v). I don't know how noticeable it will be but it may even be kind of nice to have them toned down

Note, some traces moved but I circled the key changes. Just diodes need to be added.

 

[ZipZapOuch]

If the drive levels are not adequate, and he has to mod the circuit, why not unsolder the vanilla part
and put in the solution ?

Because he wouldn't be able to goose the voltage beyond 7v with a 74-series part. See my solution to his modification request.

 

[ChrisP58]

When I connect 13 to 16, it shuts down the circuit.
Using your original diagram you gave me, and putting pin 13 to ground, here is what I get....

LED #1 comes on....stays on for 1.4 seconds and turns off.
LED #2 comes on .7 seconds after LED #1 turns off and stays on for 1.4 seconds.
LED #3 comes on immediately after LED #2 turns off, flashes twice and turns off.
Then the circuit resets.

So, is it possible to have #1 and #2 to turn on and stay on throughout the duration of the circuit?

And, is there a way to have LED #3 to turn on 1.4 seconds after LED #2 comes on and blink 6+ times before turning off and resetting the circuit?

Also, I can't use 3 inputs on the first and second bank of LED's.
If I use 2, it will illuminate, but it's dim.
If I use 3, it wont illuminate at all.
Im using only 1, 3 volt white light LED with no resistor.
using 2 LED's dims them both unless i bump up the input voltage to 6 volts.

Thank you again for all your help.

The 4017 (either the CD or the 74HC version) has up to 10 discreet operating states.

I suggest creating a table of what you want to happen for each of those states. The table will have 10 rows and look something like this:

State LED1 LED2 LED3
0 on off off
1 on off off
2 off on off
-
-
9 off off off

You can get more than 10 states, but will need more circuitry, such as a second 4017 and some extra gating logic. Or a microcontroller.

As danadak mentioned, the 74HC version of the part has higher output current, and would be an improvement for a 5 Volt system. Personally, I would add 3 2N7000 mosfets and switch the low side of the LEDs. That would make the output drive current of the 4017 almost irrelevant.

 

[AnalogKid]

The CD74HC4017 drive level looks like -

View attachment 149822

No, they do not. And implying to anyone that it is ok to use Absolute Maximum Ratings as design parameters, especially someone not experienced enough to know how dangerous that can be, is dangerous.

The image in post #10 shows that the OP purchased a CD4017B, not a CD74HC4017. The original 4017 part has lower current ratings for both the Absolute Maximums and normal operation. Here is the datasheet for the CD4017B. This is the original datasheet composed by RCA. Note the Output High (Source) Current on page 3 for the 5 V condition.

https://www.ti.com/lit/ds/symlink/cd4017b.pdf?ts=1747221523189&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FCD4017B%253Futm_source%253Dgoogle%2526utm_medium%253Dcpc%2526utm_campaign%253Dasc-int-null-44700045788370278_prodfolderdynamic-cpc-pf-google-eu_en_int%2526utm_content%253Dprodfolddynamic%2526ds_k%253DDYNAMIC+SEARCH+ADS%2526DCM%253Dyes%2526gad_source%253D1%2526gad_campaignid%253D19986097158%2526gbraid%253D0AAAAAC068F1tKayQi67_GgACGJe8CPHGq%2526gclid%253DCjwKCAjw_pDBBhBMEiwAmY02NjGzMpZ_mPre2Hxa4CLObVU72UB3fO-Sd_-S9fUtZgUkstECDbN2aRoCTioQAvD_BwE%2526gclsrc%253Daw.ds

ak