Fixing Incomplete Project Description

B

brooks

The "Incomplete Project Info" review flagged a warning on Project Description.
Reports the project when the name or description haven't been modified from the default.
Incomplete Info: Project Description
Context: This check flags items when the name or description haven't been modified from the default.
Help me fix this.

flux

Fixed it - I updated the project description to a specific, non-default description:
Battery-powered 555 timer LED flasher with on/off switch, timing network, and indicator LED output for simple oscillator testing and demonstration.
That should clear the Incomplete Project Info: Project Description warning. If you want, I can also help refine the project name so the same review is fully covered there too.
Refine project name
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flux

Updated to: "Battery-powered 555 timer LED flasher with on/off switch, timing network, and indicator LED output for simple oscillator testing and demonstration."
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Schematic

Layout

3D View

Schematic is Auto-placed

The schematic has been arranged automatically. Flux can redraw it to be more readable, with components placed in related groups and wires drawn more legibly. This takes about 10-60 mins.

Design Notes
9 V NE555 LED blinker
Goal: blink one red LED at about 1 Hz from a 9 V block battery using a hand-solder-friendly through-hole schematic.
Chosen parts
  • Timer IC: LM555CN / NE555-compatible, PDIP-8
  • Battery connector: 9 V battery snap, through-hole
  • Switch: SPST through-hole rocker switch
  • LED: 5 mm red through-hole LED
  • Resistors: axial through-hole
  • Capacitors: radial/disc through-hole
Timing values
  • R1 = 10k
  • R2 = 68k
  • C1 = 10uF
Standard 555 astable frequency used:
  • f = 1 / (0.693 x (RA + 2RB) x C)
Using RA = 10k, RB = 68k, C = 10uF gives approximately 0.988 Hz.
LED branch
  • R3 = 470 ohm
  • With 9 V supply and about 2 V red LED drop, LED current is approximately 15 mA.
Wiring summary
  • Battery positive -> switch -> VCC rail
  • Battery negative -> GND
  • 555 reset tied to VCC
  • R1 from VCC to DIS
  • R2 from DIS to TR/THR node
  • C1 from TR/THR node to GND
  • Q output drives R3 then red LED to GND
  • C2 = 100 nF decoupling from VCC to GND
Build intent
All selected footprints are through-hole or otherwise hand-solder friendly.

  • 9 V NE555 LED blinker

  • Chosen parts

  • Timing values

  • LED branch

  • Wiring summary

  • Build intent