Light Saber Hum



Introduction: Light Saber Hum

About: Rocky is a circuit designer for Electric Dreams Co., Kaohsiung, Taiwan.

"I see you have constructed a new light saber ... " Darth Vader says to Luke Skywalker in Starwars, Return of the Jedi. " ... indeed you are powerful."

Hmm, that got me thinking. As of yet I have not constructed a light saber, not even close. But this little breadboard project was as just as awesome. I wanted to recreate the sound of Vader's deep humming light saber, so after some experimentation this project reverberated to life. All of the sith lords components for this project come in Electric Dreams Kit No.1 Circuit 3. Or if you can resist the power of the darkside you can scout around for these components at a local Jawa scrapyard or DIY electronics store. The more crucial component is the actual speaker. To get that revered chilling hum sounding right, you may have to experiment a little with different speakers. Not too big not too small. And Toss that piezo aside, it will sound so pathetic you will be demoted to the Deathstar cafeteria.

Here's what you will need, Jedi:


  • 1 x 400 point breadboard (with alpha-numerical grid)
  • 1 x 1k 1/4W resistor
  • 1 x 10k 1/4W resistor
  • 1 x 4.3M 1/4W resistor
  • 1 x 0.01uF ceramic capacitor (103)
  • 1 x 10uF electrolytic capacitor
  • 1 x 555 I.C
  • 1 x 8 ohm 0.3W 40mm speaker with wiring


  • 1 x 3V battery case
  • 2 x AA 1.5V batteries (For Padawans)


  • 1 x 9V battery Clip
  • 1 x 9V battery (For Sith Lords)

Jumper Wiring List

1 x 0.4" yellow

1 x 0.5" green

1 x 0.6" blue

1 x 0.7" violet

1 x 1.0" brown

1 x 2.0" red

OR purchase Light Saber Hum here in ED Kit No 1.

Step 1: Place the 555 IC

Insert the 555 IC into slots E13,14,15,16 / F13,14,15,16. Be sure the white bar on the IC is over slots E13/F13.

Step 2: Add the Component Wiring

(A) Insert two jumper wires over the 555 IC. Place the green 0.5" wire into D14 and G15 ; the violet 0.7" wire into D16 and G13.

(B) Add the brown 1.0" wire to slots i15 and 125.

(C) Insert the yellow 0.4" wire into Y11 and J13 and blue 0.6" wire into X9 and A13.

Step 3: Add the Resistors

Insert the three resistors into the board.

(A) 10k ohm resistors goes into i14 and Y16.

(B) 1k resistor goes into H14 and H20.

(C) 4.3M ohm resistor slots into J20 and J25.

Step 4: Add the Capacitors

Time to place those two capacitors.

(A) Insert the 0.01uF (103) disk capacitor into x16 and A14.

(B) Insert the 10uF electrolytic capacitor into C15 and C18. C15 is for the longest leg (+)

Step 5: Connect the Speaker and Power

Connect your 8 ohm speaker. The positive (red) wire goes into A18 and the black (Negative) wire goes into X21.

Finally connect your 2.0" red wire into power rails: Y3 and W3. Then the battery to power rails: W31 (red) and X31 (Black)

If you followed it all correctly then she hums to life:

If nothing happens, check every thing again and repeat this aloud: "You don't know the power of the dark side, I must make this circuit."

Have Fun.

Step 6: The Video ...

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