Looking for some help and guidance on a personal project for my sport. I play underwater rugby, at international level, the referees in this use a cable operated buzzer system. Now this is a pain. I've designed a small(ish) remote buzzer that will remove all cables to the surface. My only issue is powering the damn thing. The buzzer in question is a sonitron sp7 that has an operating voltage of 0-36. So I've designed mine to use two 9v batteries in series. To make it waterproof, I would like to seal this as much as possible. So looking at making this a rechargeable affair, but this is where my knowledge of electronics ends. Would I need 9v charger or 18v? What do I need to stop overcharging them? Is it possible to fit them into a cylinder that has an I.d. of 32.5? I dont know what to expect from this as most things I've built is cnc tooling and dies for press shop so cad is no issue to me. If anyone can help or point me in a direction of somethi I need to buy or a very basic diagram (I'm not opposed to soldering) that would be very very much appreciated.
All the best and stay safe!
Ashley
All the best and stay safe!
Ashley