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Project Specification
Overview
A simple hand-solderable red LED blinker powered by a 9V battery through an on/off switch. The circuit uses an LM555 timer in astable mode to blink the LED at about 1 Hz.
Architecture
Diagram



  
    
  
  
    
  




















9V Battery
On Off Switch
Switched node_9V Rail
LM555 Astable Timer
LED Current Limiting Resistor
Red LED
GND
Timing Resistors
Timing Capacitor
Design Decisions
  • Use a through-hole LM555 in DIP-8 for easy hand soldering.
  • Use through-hole axial resistors and radial or disc capacitors for hand assembly.
  • Use a 5 mm through-hole red LED.
  • Use an SPST on/off switch in series with the battery positive lead.
  • Target oscillator frequency: about 1 Hz.
Initial Timing Choice
  • Astable equation: f = 1 / (0.693 x (R1 + 2R2) x C)
  • Initial values: R1 = 10k, R2 = 68k, C = 10uF
  • Estimated frequency: approximately 1 Hz
LED Drive Choice
  • Assume red LED forward voltage about 2 V and LM555 output drop about 0.2 V.
  • Choose LED current about 10 mA for visibility and battery life.
  • Initial resistor estimate: about 680 ohms.
Implementation Requirements
  • 9V battery input
  • On/off switch
  • 1 Hz blinking red LED
  • Hand-solderable through-hole components

    Overview

    Architecture

    Design Decisions

    Initial Timing Choice

    LED Drive Choice

    Implementation Requirements

Documents

    project-specification

    Doc 1

    Doc 2

Assets

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9V LED Blinker

9V LED Blinker thumbnail
9V LED blinker with added USB Type-C interface and STM32 microcontroller for future USB communication/programming

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$4.01–$6.93

Digi-Key

$13.70–$14.19

LCSC

$9.69

Mouser

$14.12

TME

$0.48

Verical

$8.67–$14.70

Controls