Link to instrctable:
This light beam transmitter will use any headphone audio signal to modulate a beam of light. It is a modification of the Eveready 5109LS flashlight. This is a good flashlight for under $5 (battery included). After the modification it will still work as a flashlight and will have a significantly longer run battery run time. You will also need an audio jack. I used an RCA / Phono jack but a miniature or sub miniature phone (head phone) jack will work also. Last od all you will need an audio transformer. I used a 600 ohm to 600 ohm isolation transformer which is typically used with telephone equipment. The DC resistance is about 50 ohms on the primary and secondary windings. This worked out well since one coil or side of the transformer is wired in series with the LED. The flashlight is a little less bright. This is why the batteries last longer.
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