To learn about the history of drive-in theaters, we must travel back to the early 20th century, but it suffices to say they have gone through several phases of decline and popularity in recent decades (something especially true during the pandemic), and they have responded quite well to technological advances. That means there are many historical pieces for sale on the Internet, and the Instructables user "CodeMakesItGo" decided to restore the functions of an old drive-in speaker with a complete overhaul of its internal hardware.
The web is full of tutorials that add Bluetooth support to speakers or classic equipment, and I am convinced they offer an excellent opportunity to keep our DIY side sharp without spending a fortune. But once in a while, something a little more interesting appears, and this time, the Instructables portal recommended the reconstruction of a drive-in speaker.
With a fully metallic design and "dinosaur-proof", this speaker was patented in 1972, but the user "CodeMakesItGo" discovered that the main element was manufactured in February 1981. Perhaps the speaker had already undergone a reconstruction in the past, and the user decided to repeat that process, replacing all its internals.
How to Rebuild a Drive-In Theater Speaker Over 40 Years Old
Fortunately, there are no big surprises in the speaker beyond a potentiometer and a couple of wires. The case has incredible modding potential, but "CodeMakesItGo" followed a more demanding route by adding a 3D scanner and using Fusion 360. With a 3D model on the computer, he managed to design a PCB (that accommodates the amplifier and the Bluetooth module) of exact dimensions.
I imagine the metallic nature of the case presents some challenges for Bluetooth communication, but it's clear that range is not a priority. The old cable hole allowed passing a USB connection to the battery charger, and by using a low-profile speaker, "CodeMakesItGo" had to add some foam pieces so nothing "dances" inside.
The results are very good, and what you'd expect from any modern Bluetooth speaker, including the voice of the woman that announces the pairing with horrible English. Now, personally... that USB cable has to go. I think a female barrel jack connector (one of these) would be much better, and adapting a 5V charger to that plug isn't complicated. Anyway, the balance is positive, and now I want one.
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