Don't even think about that! You'll burn the adaptor, the graphics card and even the Amiga!:madashell:
Instead, download this:
http://aminet.net/hard/hack/VGA_Hack.lha , just for guide.:rtfm:
Buy/Steal/Win/Beg_for a male VGA connector (new or from a dead VGA monitor) and a male 23 pin conn. (hard to find, take one from a dead miggy- is the external floppy one) (or make one from a 25 pin with 2 pins cutted down from one edge). :idea:
Notice that you'll don't need the TTL 74LS08 in the adaptor (maybe need, I dunno), in reverse way: inputs of the TTL are always on the Graphics Generator (RTG or AGA) side. :-D