Yard Dog Tremolo
So…this is the newest addition to my Yard Dog collection—super low rent manifestations of repurpose and modification. This project is based upon the mechanism present in the Strobe Light Tremolo; however, instead of utilizing an internal light source, the light comes from a free and ordinary cell phone app. This allows for many variations, as flashlight apps with strobe light features can vary in speed and brightness, thus allowing for a bit of customization from user to user.
I started with an ordinary sardine can—cleaned it out and drilled the holes for two ¼” jacks and a single pole, double throw switch.
It’s wired simply—audio in to switch with one side as a bypass and the other side controlled by the photocell. The photocell was extracted from an ordinary nightlight that comes on automatically when a room becomes dark.
I originally had just the piece of painter’s tape over the top, but found that the phone created noticeable interference. Therefore, I lined the inside with aluminum foil and then carefully insolated the bottom with part of a sticky note and the top with more painter’s tape, just in case the foil shakes loose. Since the phone creates so much interference and it sits on top of the unit, I cut about an 1/8” of aluminum foil to keep my signal quiet; it is barely audible when the light turns on and off. I cut a small, strategic hole exactly where the phone’s LED light exits the phone.
Duct tape was the lowest rent covering that I could thinking of, so I placed two pieces over the top and ran my thumb around the edge a few times. Then, I used a razor blade to cut the excess tape close to the outer edge. I found the hole and cut the duct tape and then wrote the name in red Sharpe.
That’s it—a simple, effective analog effect driven by digital technology.
Watch my video: