I've just bought an illuminated sign that contains 25 orange LEDs and runs off two AA batteries. I've opened it up and the LEDs appear to be wired in parallel, but I can't see a resistor. (I assume a resistor is unnecessary here due to the number of LEDs running off just 3v?)
I'm going to replace the batteries with a mains adapter, but I would also like to increase the LED brightness if possible, as they are quite dim at the moment. How could I accomplish this?