I have an elliptical cardiovascular training machine that I’m quite fond of. It has a nice computer with different training regimens, and a magnetic resistance system that is very smooth and quiet. The problem with it is that the whole thing runs on C batteries. Four expensive C batteries, that it chews through in about three months of regular use.
I finally grew weary of buying batteries for the thing, and it dawned on me that there’s a power outlet an arm’s length away from it. Why not convert it to run off that? It’s more efficient, more environmentally friendly, and much cheaper to boot.
In addition to converting it to mains, I wanted to make this hack in a completely reversible and non-destructive fashion. I like to do that when possible.
Here’s what I came up with.
I pulled a 12V/1A wall wart off the junk pile (I swear these things are having babies in the closet). That’ll be lots of juice, so now I just need to regulate it. Here’s the circuit I threw together to do that:
That’s it! What do you think? Is my love of epoxy doomed to end in heartbreak? Have I unknowingly made my exercise corner into a fire trap? Let me know in the comments.