Originally Posted by geckx7
Could 5v be enough to for solenoid to operate?
5v could power the solenoid, but gun boards are designed around 9v. There's a very simple circuit called a joule thief that can take a lower voltage and step it up to whatever was needed. It uses a tiny transformer, and a couple other very small parts all of which could fit inside your gun frame. I have considered using a cell phone battery which are lithium ion and a joule thief circuit to power my gun. It would be fully rechargeable and smaller than a 9v battery. Adding an inductive charger to it would make it totally enclosed with no external connector to charge the battery. Cell phone batteries can be purchased for a couple of dollars for older phones. I might have to revisit this idea with the inductive charger. A Lion cell battery with a 9v connector, inductively charged that was an exact fit replacement for a 9v battery is compelling.
It would be possible to have a fully regenerative gun that used air as its power source. You would always need a battery so that you had a starting point, but as long as the gun was firing, it could generate electrical power that would charge the battery. I suppose a tiny impeller could be added to wherever vented air comes out that drove a tiny magneto to generate electricity. You wouldn't impede air flow and may get what you need to charge the battery. Something integrated into the air flow path going into the dump chamber would possibly work best. Very small flat neo magnets glued inside the bolt may not add significant weight to make the bolt too heavy to fire reliably and then a pickup coil on the side of the gun body to gather the magnetic pulse might work as well. In the G4 with the Techt bolt a magnet could be added to the inside of the bolt tail and a coil carefully wound at the back of the stop block that would pick up the magnetic pulse. The wires could be ran out the back cap and sealed with epoxy around the hole. Of course with the bolt described in this thread, I don't know how it would be possible to accomplish this idea without having one in my hands to play with. I guess you could say, I'm somewhat recanting on what I said earlier. I think with a couple ms of dwell added, this would work. You would lose some efficiency. An impeller added into the air flow path into the dump chamber would not impact dwell and for most of us that have no need for 30bps firing rates, probably wouldn't impact air flow sufficiently to cause shoot down.