Cheers
Yeah, that one also includes diodes, which makes the MD pad safe to use on a C64 too. But if you're only going to use it on an Amiga, you can leave the diodes out.
A 1K resistor instead of a wire between controller pins 5 and 7 will give protection against the unlikely event of using a 3-button Amiga mouse through the adaptor, in which scenario pressing the middle mouse button would short the 5V rail to ground.