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Substituting Wall Wart for batteries
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SavannahLion:
My daughter got this cool gizmo that plugs into the TV and plays... er.. nevermind that.
I've got a device that uses 3x C batteries. If memory serves me correctly, that amounts to 4.5v if the internals wires them serially. I haven't tested this, so I'm just speculating.
Cell phone wall warts run at about 5v. If I find a wall wart with enough amperage, wouldn't it be feasible to use three sabots in lieu of the C batteries and wire the wall wart across the sabots? I've never actually heard anybody doing this so is there something I'm missing?
MonMotha:
I can't think of very many power topologies that would be designed for 3x C batteries that wouldn't accept a 5V wall wart reasonably safely. Of course, I take no responsibility if it does let the magic smoke out. You are applying a slightly higher voltage than the "design" calls for. You might chuck a ~1-2 ohm resistor in series just in case the design relies upon the batteries' inherent ESR for something.
HaRuMaN:
Permanent switch or temp? If permanent, you don't need 3 sabots... just find where the (+) and (-) feed in and wire directly to those.
ahofle:
I do what you're suggesting all the time. Just make sure the current is sufficient (1000mA is usually more than enough).
If you get an adjustable wallwart, they usually have a 4.5V selection already.
Like this:
http://www.phonemerchants.com/counacad50ca.html
SavannahLion:
--- Quote from: HarumaN on November 15, 2010, 01:19:15 pm ---Permanent switch or temp? If permanent, you don't need 3 sabots... just find where the (+) and (-) feed in and wire directly to those.
--- End quote ---
Temporary. If it was permanent, I would rather just hop down to the Hfe or Rat Shack and get the jack.
This may sound strange on a forum like this, but I actually abhor permanently modding electronics unless I absolutely have to. eg irreparable damage - exact replacement parts = hacking something in to make it work again.
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