Nixie Tube Decade Counter Setup

5v 2. 2x6 3. keep AUTO/STEP

114 days

flux

1:21

Planning circuit steps.

Defining pinout for connections.

Adding debounced components.

Integrating debounce components.

Planning debouncing and reset.

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.

Plan

#Goal

Design a 555‑clocked decade counter for a Nixie countdown circuit operating at 5 V, integrating a CD4017 decade counter with an AUTO/STEP selectable clock source, RESET input, and a 2×6 output header for displaying the counter outputs.

#Implementation plan

Clock Source and Decoupling
1. Confirm the NE555 (IC1) is configured as an astable clock using the existing trimpot (R4: 3296Y-1-503LF) and timing capacitor (TC).
2. Add 100 nF decoupling capacitors at the power pins of NE555 (IC1), 74HC14 (U2), and CD4017 (U3) to ensure power supply stability.
Clock Conditioning and AUTO/STEP Selection
1. Buffer the NE555 output (IC1:Q) through one gate of the 74HC14 (U2) to clean up the clock signal.
2. Add an optional 100 Ω series resistor at the output of the 74HC14 if needed for signal conditioning.
3. Integrate a 3‑pin AUTO/STEP header. Wire the center pin to the clock input of the CD4017 (U3) and allow selection between the auto clock (from the NE555 via U2) and a manual step signal.
Manual STEP Input
1. Add a debounced pushbutton by routing its signal through another unused gate in the 74HC14 (U2).
2. Connect the output from the debounced pushbutton to the STEP side of the AUTO/STEP selector header, ensuring that a clean pulse is generated when pressed.
RESET Input
1. Implement the pull network as recommended in the CD4017 datasheet for the RESET function.
2. Add a 2‑pin RESET header and connect it to the RESET pin of the CD4017 (U3) along with the pull network.
Output Header Integration
1. Place a 2×6 header on the PCB for the outputs (Q0–Q9) of the CD4017 (U3), ensuring that GND and VCC are also accessible on this header.
2. Label the header clearly to indicate the connection of Q0-Q9, GND, and VCC.

#Success criteria

The NE555, 74HC14, and CD4017 are correctly configured and connected to form a stable clock and counter circuit.
The AUTO/STEP header successfully allows selection between an automatic clock and a manual step input.
The RESET input is functioning correctly with the configured pull network.
The 2×6 output header correctly displays outputs Q0–Q9 along with power pins, and all components operate at a 5 V logic level.

Choose output header pinout

Find 2x6 header part

Debounce values decision

Reset behavior choice

Clock range target

114 days

Resistance

51kΩ

GND

VCC

Resistance

100Ω

GND

IC1 TR - IC1 THR

U3 CLOCK - J2 P1

RTH

IC1 TR - IC1 THR

VCC

Resistance

10kΩ

VCC

Resistance

51kΩ

VCC

IC1

Capacitance

74uF

LED1

CLK

Reviews

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Capacitor
A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Inductor
A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
jharwinbarrozo
15.9k
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
RMCF0805JT47K0
General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
jharwinbarrozo
1.2M
875105359001
10 µF 16 V Aluminum - Polymer Capacitors Radial, Can - SMD 30mOhm 2000 Hrs @ 105°C #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric)
jharwinbarrozo
1.1M

Inspect

555 Circuit

Controls

Properties

System Architecture

```mermaid flowchart TD subgraph AST [Astable] NE555["NE555 Astable"] R1["R1"] R2["R2"] TC["TC"] POT["Trimpot"] end subgraph PWR [Power] VCC["VCC"] GND["GND"] DCAP["Decoupling Caps"] end subgraph OUT [Clock Output] RES["Series Resistor"] BUF["Schmitt Trigger"] COH["CLOCK OUT\nHeader"] end subgraph RSTSTEP [Reset/Step Input] RPU["Reset Pull-up"] RSH["RESET/STEP\nHeader"] SB["STEP Button"] RC["RC Debounce"] end DC["Decade Counter"] VCC --> DCAP GND --> DCAP VCC --> NE555 GND --> NE555 NE555 --> R1 NE555 --> R2 NE555 --> TC NE555 --> POT NE555 --> RES RES --> BUF BUF --> COH COH --> DC RPU --> RSH RSH --> NE555 SB --> RC RC --> NE555 RSH --> DC ```

Availability & Pricing

Distributor		Qty 1

Assets

Welcome 👋

Flux accelerates your PCB design with AI.

Create your account to start using this component and bring your ideas to life.

crookedalt / 555 Circuit

Schematic