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Any EEs out there who can help me with a circuitry question?
I purchased an Estes rocket for my kids that uses a small chamber to run DC current through water and produce hydrogen which is, in turn, the fuel to launch the rocket. It's great when it works but the problem is that it runs on 6 "D" cells and quickly drains them.
I was able to find one post online of a person who figured out a way to hook his launch pad to a 12 volt garden tractor battery--he stated that he had measured the peak current load at approximately 6 amps. However, he didn't elaborate (but I assume he didn't simply use the 12 volt battery or else he would have fried the ignitor filament in the hydrogen chamber that glows to ignite the H2 when you push the launch button).
I purchased a portable 17 Ah power pack (they type you can use to jump a battery) that has a 12v outlet on it. I was hoping to come up with a way to reduce the voltage from 12v to 9v but maintain a 6 amp (peak) draw. However, everything/anything I can find online that reduces the DC voltage from 12 to 9 volts is only rated at 2 amps or less.
Can someone who is familiar with circuits outline what size and rating resistors would be required (and whether in series or parallel) to be able to accomplish this? Obviously, I am hoping to come up with something relatively inexpensive and that I could place in some sort of small enclosure. At one point I thought perhaps I could use an old power supply from a PC, but any that I've found that have a 9v lead only have a minimal amperage rating.
Thanks for your help
I purchased an Estes rocket for my kids that uses a small chamber to run DC current through water and produce hydrogen which is, in turn, the fuel to launch the rocket. It's great when it works but the problem is that it runs on 6 "D" cells and quickly drains them.
I was able to find one post online of a person who figured out a way to hook his launch pad to a 12 volt garden tractor battery--he stated that he had measured the peak current load at approximately 6 amps. However, he didn't elaborate (but I assume he didn't simply use the 12 volt battery or else he would have fried the ignitor filament in the hydrogen chamber that glows to ignite the H2 when you push the launch button).
I purchased a portable 17 Ah power pack (they type you can use to jump a battery) that has a 12v outlet on it. I was hoping to come up with a way to reduce the voltage from 12v to 9v but maintain a 6 amp (peak) draw. However, everything/anything I can find online that reduces the DC voltage from 12 to 9 volts is only rated at 2 amps or less.
Can someone who is familiar with circuits outline what size and rating resistors would be required (and whether in series or parallel) to be able to accomplish this? Obviously, I am hoping to come up with something relatively inexpensive and that I could place in some sort of small enclosure. At one point I thought perhaps I could use an old power supply from a PC, but any that I've found that have a 9v lead only have a minimal amperage rating.
Thanks for your help