I have a couple of portable LED lighting units where the control boards have failed. They use a 6 volt Sealed Lead Acid batteries. When the mains supply is on the LED lights are off and the battery is trickle charged and when the supply fails the LRED lights come on.
The actual supply to the control PCB is 12 volt. I have searched for a suitable suply design but not been able to find one. Can anyone help with the design of a suitable circuit or point me in the right direction? I am capable of building a circuit but not designing one.
Any help much appreciated.