Originally posted by bitbox
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You might try to run your motor with the bad battery you have already. worst thing that happens is the motor starts right up and you have to recharge the good batteries for a bit. also, if the bad battery is on the edge, this might fix it pretty well instantly, which happened to me once already.
It sounds like you and your friend are on the right track, you just need to find the right battery for B3. You can also make your own B3 with just a couple of bucks and a trip to the store. I made one out of a couple of copper plates and a couple of aluminum plates and some alum mixed in water. It works great, and because it's small, even if it does get charged, it will never hold more than a volt or two on it's own.
There is a 9-18V motor that you can buy at radio shack, which is the same motor I started with. it's pretty small, but it works well enough to see the same results.
You can always make your own motor too. I took apart a hard drive and kept the motor out of it. I taped some magnets to the top and used a reed switch rather than commutators, and it worked to my surprise.
This is honestly one of the most flexible systems I have ever worked with. most of the variables I have tried have produced decent results.
It works with AA batteries as well. I had a couple of alkaline AA's for my good bats, and used a NiCd rechargeable as B3. when I started, the NiCd was reading 0V, which is clearly a dead battery. using the HD motor and the reed switch, That battery fixed itself, and is now holding 1.2V and will run a small 3V DC motor slowly.
If you have an old printer laying around, take it apart, there are usually at least 3 motors in the ones I have scrapped, and they also work well in this system. The most important things to know, you already seem to have right, from there, don't be afraid to experiment around a bit. You never know what you will find, and as I said above, the worst thing that can happen is you have to recharge your batteries a bit for the next attempt (or blow out a motor, which also isn't the end of the world, they will make more )
glad to see you are on board, and hope you can find what you are looking for to make this work. It's pretty amazing to see running, and once you get it in the zone, the results get even better!
N8
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