Can someone please help! I am trying to get this order finished. I know the chip is rated to 18V and there are some tantulum caps before the V+ and V-. Basically I need to know if the amp can run on 24V or if it will fry the chip.
Ok, hold on. The + of one battery and - of another are supposed to be grounded in the original design. Could I just use a single supply and apply +15V to one side and -15V to the other and just omit the ground? Or do I need a dual supply?
assuming you're using the NJM4556, it's rated 36V, ie +/- 18V, so the 24V supply would be fine. However, the arrangement of the batteries in the RA-1 means the ground is at the junction of the two. Unless you use a dual supply, you'll need to have some way of creating a virtual ground. IMO, you're no longer building an RA-1 clone when you do that, as many attribute some of the tonal characteristic of the RA-1 (just a well calculated CMoy, really) with that arrangement.
JV, a single supply doesn't give it +/-15V, it puts out 30V, the +/- have to be referenced from a ground you then create, and therefore are dependent on it, so you can't "omit" ground as you put it