Well, my latest half-baked idea, curious to know if I'm off-track. Should be an easy answer.
I have a number of devices that take batteries, and I'd like to avoid purchasing batteries (even rechargeables).
What I'd like to do is wire leads into the contacts of the device(s) going through a simple circuit from an AC/DC converter wall wart.
I'm figuring that an e.g. 2-AA battery compartment wants 3V at whatever current (I'm assuming my AC/DC converter will have ample current compared to batteries?).
I'm figuring that the converter, say it's putting out 9V, needs a voltage-dropping resistor (which wastes power/makes heat?) or a DC voltage converter (which, if cheap, makes messy/noisy power and also isn't too efficient?) to get to 3V.
I'm figuring that I can use a pair of dead batteries with the leads attached to the ends (one +, one -) and the other ends of the batteries covered with non-conductive material (to prevent short circuit), so I have an easy way of getting the leads down into the battery compartment to their destinations.
Curious to know if those assumptions have anything to do with reality, and the best way to achieve the desired voltage?
There's probably a product for this out there? I like to DIY, especially because I have a pile of various DC adapters.
Thanks a lot!
-C
I have a number of devices that take batteries, and I'd like to avoid purchasing batteries (even rechargeables).
What I'd like to do is wire leads into the contacts of the device(s) going through a simple circuit from an AC/DC converter wall wart.
I'm figuring that an e.g. 2-AA battery compartment wants 3V at whatever current (I'm assuming my AC/DC converter will have ample current compared to batteries?).
I'm figuring that the converter, say it's putting out 9V, needs a voltage-dropping resistor (which wastes power/makes heat?) or a DC voltage converter (which, if cheap, makes messy/noisy power and also isn't too efficient?) to get to 3V.
I'm figuring that I can use a pair of dead batteries with the leads attached to the ends (one +, one -) and the other ends of the batteries covered with non-conductive material (to prevent short circuit), so I have an easy way of getting the leads down into the battery compartment to their destinations.
Curious to know if those assumptions have anything to do with reality, and the best way to achieve the desired voltage?
There's probably a product for this out there? I like to DIY, especially because I have a pile of various DC adapters.
Thanks a lot!
-C