Nixie Tube Decade Counter Setup

Thought for 1 min 38 sec

flux

I’ll integrate a CD4017 decade counter clocked by your 555 for the Nixie countdown.

Add CD4017 with 100 nF decoupling; power from VCC/GND.
Route IC1:Q through U2 to CD4017 CLK; add a 3-pin AUTO/STEP clock-select header.
Add debounced STEP via spare U2 channel; add RESET pull-up/header to CD4017 RST.
Break out Q0–Q9 to a header; for countdown wire Q0->digit 9 … Q9->digit 0.
Verify VCC: if >6 V, avoid 74HC14 to VCC; use a CD40106B buffer. If 3.3 V logic is used, switch to a CMOS 555 per best practice.

Click Start on the plan bar to run this. Quick checks:

What is VCC?
Do you want Q0–Q9 on a 2×6 or 1×12 header?
Keep the AUTO/STEP via jumper-select, or prefer diode-OR so both are always available?

superchef42

Thought for 1 min 21 sec

flux

Goal acknowledged: integrate a 5 V 555‑clocked CD4017 with AUTO/STEP, RESET, and a 2×6 outputs header.

Plan:

Clock: Keep IC1 with R4/TC; add 100 nF decouplers at IC1/U2/U3.
Conditioning + select: Route IC1:Q through U2 to U3 CLK; optional 100 Ω series; add Pin Header 01x03 2.54mm AUTO/STEP with center to CLK.
STEP: Add debounced pushbutton via spare U2 gate to STEP side of selector; use 10kΩ Resistor + 100nF Capacitor.
RESET: Add pull network per CD4017 datasheet and Pin Header 01x02 2.54mm to U3 RESET.
Outputs: Place Pin Header 02x06 2.54mm for Q0–Q9 plus GND and VCC.

Click Start on the plan bar to run this.

Choose output header pinout

Find 2x6 header part

Debounce values decision

Reset behavior choice

Clock range target

Files

Pins

Symbol

Layout

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crookedalt555 Circuit