photo blog of recent D.I.Y. happenings in and around my workshop

Jacobs Ladder

Filed under: Electricity and Electronics — dynamodan @ 7:53 pm April 12, 2008

Here is a jacob’s ladder I made, and I added a little circuitry to make
it act as a speaker.  Then, of course, the best thing to do next was
play the song “We Are Climbing Jacob’s Ladder” through it.  The sound
is a bit quiet in the background, but it’s there, and it’s all produced
by the arc.  Enjoy.

This is a tiny Jacob’s ladder made with a flyback transformer from a

computer monitor.  There are just a few turns of #14 enameled wire on
the exposed part of the ferrite core, driven by an International
Rectifier IRFP460 mosfet.  The driving circuit is made of two sections,
an oscillator made with a KIA4558P dual op amp, and an audio amp made
from half of another KIA4558P that performs PWM modulation in the oscillator.
Sorry, schematics not available (for now).The little Nextar MP3 player is providing the audio signal.  Power is provided by the 12 volt output from a PC power supply modified for standalone benchtop use.  Current draw varied between 2 and 3 amps.

The sound is a bit quiet in the background, but it’s there, and it’s all produced by the arc.  Enjoy.

(This is my first youtube movie, ever)

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