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.
7 thoughts on “Cardio Power”
Wouldn’t a 6V wall-wart be easier than regulating a 12v adapter? or was a 12v all you had?
I love the standoffs-as-dummy-batteries idea.
Thanks, David! I was just glad to finally find a use for some of the junk that comes in the Jameco “standoffs grab bag”.
Any wall wart would likely still need regulation (they make terrible, terrible power), so it would have to be a couple of volts over the demand anyway. Mainly though, as you say, it’s what I had on hand.
We have the same multimeter!
(And nice hack :D)
Hah! Almost thirty years, and it’s still ticking. I like that meter.
I found mine on the side of the road. Took it home assuming it was broken but chucked some batteries and it worked!
Awesome hack. I recently did a similar hack with a battery powered soldering iron from the shack. When i broke it apart, amazingly there wasn’t any voltage regulation other than a resistor on the power LED. So i wired up a usb plug to the pins and now have a wired wireless soldering iron. I’ll probably get heckled for doing this, but I needed the smaller tip and had no batteries to finish the project I was working on. As it’s said, “Necessity is the mother of all creation!” btw it was Cat# 64-039 from RS.
Nice mod…. I admit when I first saw the title my mind jumped to you converting it to output mains power! you know to power the TV while you run!
EARN THAT TV!! RUN RUN
Still a great mod!
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