Blinking LED Circuit Design

flux

0:33

Modifying layout rules.

Analyzing the PCB layout.

Working.

Running design review.

Analyzing the PCB layout.

Updated all 4 existing VBAT_RAW trace segments to Bottom Copper and verified the change in the layout. The airwire check still reports 14 remaining airwire errors overall.
3 days

Updated 4 layout rules

0:01

Set Trace's layer to "Bottom Copper"

Set Trace's layer to "Bottom Copper"

Set Trace's layer to "Bottom Copper"

Set Trace's layer to "Bottom Copper"

3 days
dacre

dacre

Update the layer of traces on net VBAT_RAW to Bottom Copper
3 days

flux

1:12

Checking layout modifications.

Analyzing the PCB layout.

Analyzing the PCB layout.

Analyzing the PCB layout.

Analyzing the schematic.

Analyzing the PCB layout.

Working.

Analyzing the PCB layout.

Updated 4 existing VBAT_RAW trace segments to Bottom Copper.
3 days

Updated 4 layout rules

0:01

Set Trace's layer to "Bottom Copper"

Set Trace's layer to "Bottom Copper"

Set Trace's layer to "Bottom Copper"

Set Trace's layer to "Bottom Copper"

3 days
dacre

dacre

i want you to update placement of J1 in the same location as SW1 and flip it's side to avoid overlap of the two
3 days

flux

0:38

Evaluating project placement.

Analyzing the PCB layout.

Working.

Running design review.

Moved J1 to SW1’s exact PCB position and flipped J1 to the Bottom side to avoid top-side overlap. Post-check shows no overlapping copper errors, with 14 airwires still remaining overall.
Check J1/SW1 DRC
Route J1 airwires
Show placements
Verify connector clearance
3 days

Updated 2 layout rules

Set J1's position to "-3.6616mm -26.9586mm"

Set J1's layer to "Bottom"

3 days
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Project Specification — 555 LED Blinker
Goal
Design a simple through-hole timer circuit that blinks a red LED once per second from a 9V PP3/block battery through an on/off switch.
Architecture
Diagram



  
    
  
  
    
  























9V battery connector J1
On off switch SW1
Switched node_9V rail
NE555P astable timer U1
680 ohm current limit R3
5mm red LED LED1
GND
100nF decoupling C2 and node_10uF bulk C4
47k R1 plus node_47k R2 plus node_10uF C1 timing network
10nF control bypass C3
Selected values
  • U1: NE555P, DIP-8 through-hole timer.
  • J1: Keystone 967 9V battery snap connector.
  • SW1: SPST maintained on/off switch in series with battery positive.
  • R1 = 47kΩ, R2 = 47kΩ, C1 = 10uF for astable timing.
  • Calculated frequency: f = 1.44 / ((R1 + 2R2) x C1) = about 1.02Hz.
  • R3 = 680Ω for approximately 10mA red LED current from 9V, allowing for LED forward voltage and 555 output drop.
  • C2 = 100nF VCC decoupling, C3 = 10nF control pin bypass, C4 = 10uF bulk input capacitance.
Hand-soldering notes
All selected components are through-hole or hand-solder-friendly: DIP-8 IC, axial resistors, radial/disc capacitors, through-hole/panel switch, battery connector, and 5mm LED.

    Goal

    Architecture

    Selected values

    Hand-soldering notes

Documents

    Project Specification — 555 LED Blinker

    Design Notes — 555 LED Blinker

Assets

Assets are files uploaded to this project which can be used in various ways.

555 LED Blinker thumbnail
9V battery-powered 555 astable timer circuit that blinks a through-hole red LED at about 1 Hz through an on/off switch.

Properties

Pricing & Availability

Distributor

Qty 1

Controls